Film cameras
Leica close-up and Photomicrography User manual
User manual for Leica close-up and Photomicrography. 48 pages in English. Read the original PDF, download or print a copy without registration.
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- Leica
- Model / document
- Leica close-up and Photomicrography
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- User manual
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- English
- Pages
- 48
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- 6.3 MB
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- Film cameras
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Page 7 · Read text
LEIIZ COPYING EGIUIPMENT
r$Tithin recent years there has been wider recognition of the fact that the
miniature camera,which has already revolutionized the technique of amateur
and pictorial photography, has as much to contribute to the progressof the
working methodsof professionalphotographersof all kinds and thosepractic-
ing photography for scientific purposes. Many amateurswho took up the
Leica merely as a means of pleasure and recreation made the discovery
that it could also be an instrument of real value, by virtue of the series of
practical.accessorieswhich we have developedfor it in the courseof time.
Copying does not limit itself to the reproduction of written matter and
drawings, but includesthe making of recordsof objectsof the most varied
kind and size, to produce negativesfor printing or enlarging in the usual
way or for projecting in the form of positives.Projectionis the best way of
presenting, to the public, printed reproductionsor lectures with lantern
slides, of objects which are not directly accessibleor are unavailable for
vlewrng.
Miniature photography representsan important advance in this line of
work. Its advantagelies in its ability not merely to produce large numbers of
negativesand positives at a minimum cost, but also to store and carry them
with the least possibleinconvenienceand to project them with small, light
and inexpensiveprojection equipment.
The medical expert, lecturing to a conferenceon his work and having his
evidencein the form of large X-ray films, which are too valuable to be taken
along and indeed too large to be projected without special apparatusbeing
available,reproducesthese results by means of his Leica. An ample number
of positives can be taken anywhere,and easily projected onto a screento a
size of 8 x 12 ft.
The historian or the handwriting expert may desire to show parts of an
old volume which he may neither remove from the archiveswhere it lies nor
exposeit to the strong illumination of powerful light-sources;he can, how-
ev-r, copy the folio p4ge by page without having to take it away, examine
either the negativesbr a positive strip at his. ease.at home with our desk
viewer, prepare enlargementsto any desired size with the Focomat Enlarger
and thus utilize them with the most successfulresults in journals or rnono-
graphs.Large numbersof scientificspecialistshave alreadyconvincedthem-
selvesof the value of this method. The very low cost of the negativematerial
eliminatesany question-and of excessiveexPense.
The botanist the zoologist, the mineralogist and petrographer, the
archeologist,the entomologist and many other scientistshave similarly come
to appreciatethe advantagesof miniature photography.
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Oul copying devicesare not only suitable for scientificuse but are em- .
ployed with great successfor commercialand industrial purpor.r. Tt. value
of tttS photograpihc.processin duplicatingand, particulariy,in tf,. wide field
ot advertrslngls evtdent,and thesemethodsare achievinggreat importance,
in fact, they have already achievedit.
Deftnilions: The pltotonticrograpby,nacropbotograpby,and mino- .termspbotograpby.are often-inter-used,mlsinieipreted,dr simlty unJ.rstood.
These are the accepteddefinitions: "6i
MrcnopsorocRApHy: The rep.roductionof any object on a very minute
scale.The grainlessstrutture of a collodibn trans_
parencylends itself particularlywell to this work.
MacnopnorocRAPHY: Photographsof small objects reproducedat nat-
ural or larger than natural size,-madewithout a
microscope.
PuorourcRocRApHy: The.photographyof minute objectsby the use of
a microscopein conjunctionwith a camera.
Figure | . Mocrophotogroph, Figure 2. Photomicrogroph.View original page 8Page 9 · Read text
THE FOCASTIDE
You can make all types of close-up-flowerspictures with your Leic-acamera and
the Focaslide. . . from a cluster of down to the head of a pin, to
reveal detail which normally cannot be seen.Copying, nature photography,
medical photography and a host of other picture-makingopportunitiesare
opened tb youl Gro"nd glass focusing is provided and the Focaslidecan be
used with all Leica lenses.
How lt Works: The principle behind the Focaslideis simple: it enablesthe
lens to be extendedolt from the camera,closer to the subject.This magni-
6es the image on the negative.The further the lens is extendedfrom the
camera,the greater is the image magnification.
The Focasl-ideextendsthe lens appioximately12mm. from the camera.To
permit greaterseparationof lens from camera,a number of ExtensionTubes
ire auatrablein the following lengths: 7mrn., 1)mm., 30mm., 45mm.,60mm.
and 90mm. The Tubes can-be used singly, or together in tandem arrange-
ment, to provide a seriesof extensions.Thus, with the use of two 90mm.
and one 6bmm. ExtensionTubes,a subjectonly 3/L6 xl/32 inchescan be
made to fill the entire negative area..
The Adjustable Micrometer Extension Tube is the ideal adignct to the
Focaslide,as it allows a wide range of Leica lensesto be used for copying
work. \Tithout adapters,it acceptsall Leica lensesand gives_a 20mm. range
of adjustment between a 40mh. and {Omm. length of . Extension Tube.
Micrometer indexing of the mount enablesaccuratesettings !o. h main-
tained for varying scalesof copying work. Adapters are availablefor all
90mm., l27mm. *a r31 mm. Liica lensesto convertthe AdjustableMicrom-
eter ExtensionTube into a short focusing mount for use at infinity.
The Intermediate Focusing Mount insures crisp definition when photo-
graphing objects'slightsuch as manuscripts.It obviates.anydistortion..ofthe image "the lateral displac6mentof the lens which will occur if a i". to
Leica cameralEns, attacheddirectly to the Focaslide,is focused in its free
position.
The large selectionof magnifiers facilitate rapid focusing of -obiectson
the grounl glass screenof the Focaslide.Extreme accuracyof. foc.usingis
assuied withi the 30x Magnifier by observing the air-image in the clear
center-spotof the screen.
How to Mounf the Focoslide: The Focaslidecan be attachedto a Ball-
Jointed Tripod Head which is, in turn, securedto a-steadytripod..The large
ball-Jointed Tripod Head definitely insures freedom from vibration. Its
improved and rilid constructionpermits the camerato-be sw-ung.andposi-
tivily located at-any angle. Less than a quarter-turn of the thumb-screwto
either left or right, s.*es to releaseand lock the tripod screw instantly
without effort.
The Focaslide can also be attached to the sliding arm used as an offset
support on a Leitz enlarger baseboardand upright.
In either case,the Focailide is fastenedto iti mounting by a screw through
one of its two threaded sockets(4) on the Fixed Plate (B).
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ll
;f
eU
&* r8
17
5
Figvre 3. rhe Focoslide sliding plote ond Fixed plote.
Nomencloture for Figure 3.
A. FocaslideSliding Plate 10. Cut-out for slow speeddial
B. FocaslideFixed Plate l l . K n u r l e d n u t
l. Supporting post 12. Retaining screw
2. Dovetai I grooves 13. Leather-paddedspring clamp
3. Slotted krcking lever 14. Camera positioning bar
4. Threaded sockets I5. Fixed stop
5. Leica lens thread 16. Ground glass focusing screen
6. Lens flange seat 17. Locking-bar stop
7. Retaining screw 18. Parallel dovetail runners
8. Knurled screw 19. Dclvetail groove retainers
9. Rangefinder window recesses 20. Aerial focusing clear spotView original page 10Page 11 · Read text
Setting up the Focoslide: The Focaslideconsistsof a sliding plate (A),
frg. 2, with parallel dovetail runners (18) along its sides anda fixed plate
( B ) with parallel dovetail grooves ( 19 ) . The Focaslide is supplied with
the two parts fitted together.
socket (5) of the fixed plate (B).
Note: Leica cameras having serial numbers lower than 400,000 are lmm.
smaller than higher serial numbered cameras; therefore it is essential that
Place the Focaslide in the position shown so that the ground glass focus-
ing screen (16) is at the right, and the lens flange seat (6) is to the left.
Loosen the knurled screw (8) and push the camera positioning bar as far
to the right as it will go.
Turn the knurled nut ( 1 1 ) counter-clockwiseas far as it will go - to the
top of the supporting post ( 1 ) . Swing the f eather padded spring clip ( 13 )
to the right or left so that it will not be directly over the circular opehing of
the lens flange seat ( 6 ) .
The Leica camera and the lens are attached to the Focaslide separately.-body
After the lens has been unscrewed from the camera, the camera is
mounted on the sliding plate (A). The flange ring of the camera will fit
into the lens flange seat (6). The rangefinder windows of the Leica will fall.
into the recesses(9) on the top of the sliding plate while the slow-speed
Figvre 1. Selling the shulter speed before oltoching the leico to the Focoslide.
Slow speed diol will
now operofe ol "Time"
10 Cul-out for slow speed diol
Recesses for ronge-finderwww.butkus.uswindowsView original page 11Page 12 · Read text
Align comero ond tighten
knurled knob
Leother podded clomping bor
\
=7
-f-
I r
ta
- S h u t t e r
m o y b e s e t f o r " B u l b
exposure, if preferred.
Figvre 5.Clomping lhe comero on lhe Focoslide with the Spring Clomp.
diat of Leica or the slow-speed cover plate of the Leica (Models Ic and
IIc) will fall into the cut-out (10) at the left end of the sliding plate.
Set the top shutter speed dial to l/3o second. The Slow Speed Dial will
now_ operate at "Time," or the shutter may be set for "Bulb" exposure if
preferred.
Swing the spring clip to a position directly over the back of the Leica
camera. Turn the knurled screw clockwise, tightening the spring clip against
the camera. This holds the camera to the Focaslide.
Still holding the camera in position, push the camera positioning bar
(14) as far to the left as the camera permits it to move, so that the forked
end of the positioning bar is securely against the camera body. Secure the
positioning bar by tightening the knurled screw (8) in a clockwise direction.
Screw the camera lens into the flange ring ( 5 ) , from the underside of the
fixed plate ( B ) . If intermediate extensior tubes are to be used, the male
end of the tube or series of tubes is screwed into the flange ring, where the
lens would normally go, while the lens screws into the threaded receptacle
at the other end of the tube or series of tubes.
Figvre 6. Aligning the comero with the Posifioning 8or.
Srrrg
J3lrl9M
rl!sl lsur]
UU'Oaltax wj
1 1View original page 12Page 13 · Read text
Mognifiers for the Focoslide
Five magnifiers are available to facilitate focusing and image viewing on
the groutd glass screen of the Focaslide. These are:
5x Magnifier with focusing sleeve
5x ruflide-Field Magnifier with focusing collar
jx rvide-Field Anlular (90o) Magnifier with focusing collar
4x tVide-Field Angular (90o) Image Reversing
Magnifier with focusing collar
30x Magnifier with focusing sleeve
Figvre 8. fhe 30x Mog nifier over lhe cleor cenfer
Figure 7. 5x Wide'Field Angulor (90') spol of the focusing screen, for observotion o(
Mognifier with focusing collor. oeriol imoges.
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magnifier shows the image right side up and correct as to right and left.
The 30x magnifier is used where most critical focus is required-. It positions
over the clear central spgt of the ground glass and views ^n aeriil image,
the same as if the ground glass were removed from the Focaslide.
Mount the magnifier to be used over the ground glass screen of the
Focaslide, using a rotating motion to engage lhe bayonet flanges on the
base of the magnifier with the bayonet catihes on the collar frolding the
ground glass screen. Adjust the focusing sleeve or collar of the magnifier
until the cross lines in the central clear portion of the focusing screen are
sharp. Leica lens is then focused until the image viewed through the -The
magnifier is sharp.
When using the low power magnifiers, the clear spot is ignored and the
image focused on the ground portion of the screen.-\7'hen-using the 30x
loyed. Correct focus is assured when
r to the cross lines as the eye is moved
arallax focusing.
ld prevailing in close-up photography,
hragm at full opening, stopping to a
harp.
Figure 9. The four boyonet flonges of the 5x Figure 10. Ihe lorge wide field mognifier is
Magnifier fit the boyonet cofches. similorly fitted to fhe boyonet cofches.View original page 14Page 15 · Read text
Figvre Il. tocking lever ot |ull lorword Figvre 12. Locking lever oi full bqck posilion
position lor removing sliding plote. for focusing-
Operoting the focking lever: When the Focaslideis supplieg,,1. slotted
fr&irg i.i.r (3) has bEenpushedback as f ar as it *!J go.,so that its curved
end sn-uglyengages-directionthe stop ( 17) on the fixed plate.Th: sliding plate cannot
move in- 6itn.". *a the ground glassscreenis positioneddirectly
over the lens.
The locking lever has three positions: pushed as far back as it will 8o;
pulled forward as far as it will go, in which casethe sliding.plate can rnove
itt two directions;a mid-way positionto which the locking lever can.be set.
This latter position can be'"ielt" through a springed stop in thg locking
lever mechinism, and it permits the sliding plate to be moved in one
directiononly.
Lubricate[n. parallel dovetail runners ( 18) grooves ( 19) occasion- "qd as f ar as it locking ally with Vaseline. By pulling forward the slotted l.y.l
*iil go, the sliding plite can be removed for cleaning and lubricating.
r4
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HOW TO USE THE FOCASTIDE
In copy work it is necessaryto stop the diaphragmof the lens down to at
leastf/6.3 in order to obtain-sufficientdepth 6f nefd. This, plus the fact that
the use of extensiontubes.requiresincreised exposures,t.*ltr in relatively
long exposures.It is thereforenecessaryto prevint vibiation of the copyin!
equrpment.
Center and focus i{gg that appearson the ground glass focusing 1!e
screenof the Sliding Plate.If the Focaslideis mounted"onthe Saseboardanil upright of a Leitz enlarger,.through the use of a Sliding Arm, centering of
the image best accomplisfredby moving the object ii, u. photograpf,ed. -is
done by moving Focaslide to or ui^y fiom the .\oog! ^focusing.is _th;
subiect.If the baseboardand-uprigfrt-of a Leitz enlarger are being used in
conjunctionwith a Sliding Al-, this is simply u..o-flithed by miving the
Arm along the enlargerupright until the proper position is atiained.Vh.n
the image.on the glass is ihuip, ih. l.nr itself is critically .ground .fairly focused.This can be done by rotating the mount of the lens in the normal
manner.
After the image has been centeredand focusedon the ground glass screen,
lever on the Sliding Plate, to its inter'mediatelosition so To::,th.-locking
that the Plate will be free to move in only one direction. Move tire Plate in
this "free" direction until it is arrested the fixed stop. The .r.lra open- !f ing will-be directly over the lens and the exposure.^r, b. made.
To refocus and recomPose.a new subject, rioue the Sliding Plate back so
that the circularhousing-havingthe ground glass focusingscieenis over the
lens. Pressthe locking lever asJar bi-ck as it"witt go so tfiat it fulty engages
stop. Recomposeand refocus.
lens Choice: For use with the Focaslide,the 50mm. Elmar lens is recom-
mended.Leica lenseshaving rigid mounts can also be usedwith the Focaslide.
Note: Becaate of its tbicLnei, the Focaslide acts lihe a 12mm. Extension
Tube, so that the lens ased tuith it i: further dwdy from tbe ftm plane tban it
would. be if screweddirectly into. rbe camerale-nsopening, LensLsuitb rigid
moants cAnnot, tberefore, be focased at relatiaily laige distances up to infnity.
obiects with thicknessare to be reproduced,the use ,Vhen .appreciable
l9nge1focal length lensesthan one of iOmm., suchas 9bmm., or L35rnm., 9t
is advisableto obtain betterperspective.
tUfith longer focal lenses, greater working distance is permitted . .lengih
between the lens and subject. convirsely, when i-.nr., of shor^terfocal
length.are employed, the working distancebetweenthe lens a"d r"bjeil
ts shorter.
15View original page 16Page 17 · Read text
EXTENSION TUBES
90mm.
| Smm.
Figvre 13. fhere ore 6 exlension lubes ovoilobfe.
7mm.GTo permit greater separationof lens from camera, extension tubes are
availabiein the followi"g lengths: 7rnm., 15rnrn., 3Ornrn.,45mm., 60rnm.,
and 90mm. The tubes cin be-used singly, or together in tandem aff^nge'
rnent, to provide ^ seriesof extensiogs.Thus-,with the use of two 90mm.
and one 60-m. extensiontubes, L subject only ,/16 x 7 /t2 inches can be
made to fill the entire negative area.
AD.IUSTABLEMECRONilETEREXTENSIONTUBE
The Adiustable Micrometer ExtensionTube is engineeredwith the sarne
precision ^r ^ focusing rnount for a Leica long-focus l.gt. It is the ideal
ldjunct to the Focaslide,as it allows a wide iange of Leica lensesto be
.5.d for copying work. Micrometer indexing of the mount enablesaccurate
settings to bL riaintained for varying scaleJof copying work.
Adiusroble Microm eter Exlension Tube
Flonge Ring
Elmor50mm.lens
Figure | 1. Extension tub e, flonge ring and 50mm. Elmor lens.
16
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\When used in conjunction with the extension tubes as an adjustable
micrometerextension,it gives a 20mm. range of adiustment.
tVith the flange ring supplied, it acceptsall Leica lensesin their normal
mount and offers a rangeof adjustmentfrom 40mm. to 60mm.
Leica 50rnm. Iensesscrew directly into the flange ring of the micrometer
extensiontube. Adapters are availablefor all 90mm., L27mm., and 135mm.
Leica lenses.
and screwsdirectly into the tube.
D i r e c t i o n s i o r A i i g n m e n ?
Figvre | 5. Three sleps in oligning lhe Adiustoble MicromelerMicromeler ExlensionExlension f ube.
A. Screw the adjustablemicrometertube into the threaded flange of the
Focaslide,seatingit tightly and setting for the shortestextensionof 40mm.
The focusing index will possibly not align with the front of the Focaslide,
but at sorneintennediateposition.
B. Use a small jeweler's screwdriverand loosen the three counter-sunkset
screwsin the top knurled ring of the micrometertube. Turn the ring until
the focusing index is facing to the front of the Focaslide.Retighten the set
screws.
C. Loosen the three counter-sunkset screwsin the bottom knurled ring of
the micrometertube. Turn the ring until the L2 line is in alignment with 0the focusing index. Retighten the set screws.
Care should be taken when making this adjustment that the focusing
mount is not moved. It should remain at its shortestextension.
The adjustable micrometer tube may be taken off the Focaslide and re-
placed as often as desiredwith complete assurancethat the focusing index
will always align correctly.When using the micrometertube on another
Focaslide,it may be necessaryto reset the index.
T7View original page 18Page 20 · Read text
Formulo for Colculoring Exposure
wirh Extension Tubes
\WhenExtensionTubes are usedon the Focaslidethe lens is moved further
^way from the film plane in the camera.This reducesthe relative amount of
light reaching the film so that an increaseof exposure is necessary.The
amount by which exposuremust be increasedover that required without
Extension Tubes may be calculatedfrom the following formula:
D ' T^ -- F 2
Explanation of Symbols:
T - Exposure factor.
D - Distance from the lens to the film plane. This distanceincludes the
focal length of the lens, plus the length of the Extension Tube or
Tubes, plus the extension provided by the Focaslide (approx.
12mm.)
F - The focal length of the lens used.
Eilmple:
\7hat is the exposure factor when using a 50mm. lens with a 45mm.
extensiontube ?
ExposureFactor- Focal length of lens, plus length of exten-
sion tube or tubes, plus extension of
Focaslide squared.
Focal length of lens squared
. Amount of extension50 + 45 f 12mm. - 107mm.
1 0 7 X 1 0 7 - r r , 4 4 g
50 x 50 2.500 4'6
E*no,,,,5i;il,:Tf x-atetY
A quick referencetable giving exposurefactors as well as other essential
data when using 50mm. lensesand various Extension Tubes with the Foca-
slideis reproducedon the next page
The table applies only to )0mm. Leica lenses. \Zith lenses of shorter
focal length, a given Extension Tube causesgreater relative image magni-
ficationthan it would with a 50mm. lens, and will require a correspondingly
greater increasein the exposure factor. \7ith a lens of longer focal length
than 50mm., the same Extension Tube, will give rise to a relatively lower
imagemagnificationfactor than the 50mm. lens and will not require as great
an increasein exposureas that necessaryfor a 5Omm.lens.
rgView original page 20Page 21 · Read text
Lens Adopters: Adapters are available for all 90mm., I27mm. and Brmm.
Leica lenses to convert the ad justable micrometer extension tube into a short
focusing mount for use at infinity. The versatility of this accessoryis exten-
ded by these four adapter rings which accept the lens components of the
following lenses: the 9Omm. Elmar f /4; 9bmm., f /a.5 ; l27mm., f /4.5 ;
and the I35mm. Hektor f /4.5 (long-focus) lens.
Vhen using the 90mm. Leica lens component.s, the flange ring at the
end of the adjustable micrometer extension tube must be removed by un-
screwing in a counter-clockwise direction. The adapter is then inserted in
its place. Then mount the lens component to the adapter.
90mm. f /1, Focusing Mount
90mm. f / 4.5 Focusing Mount
Adiusfoble
Micrometer
Exlension
T ube
Adopler Rings
Elmorg0mm.f/1lens
FIonge Ring
Figvre 17.The flonge ring must be removed before fitting either of the two 90mm. lens odoplers
lo the Adivstoble Micromeler Extension fube.
20
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* 1
(
Figure 19. Set up lor copying docu-
menfs. lomps (no] visible in pictvre)
should be of sorne power ond egui-
distanlly spoced for even illuminolion
ol the monvscripl.
bIView original page 24Page 25 · Read text
Etposure Colculotion: To apply an exposurefactor (ur determinedby the
formula) it is first necessaryto determine the "norrnal" exposure for the
subject. !7ith small subjects this presents a difficulty when using a photo-
electric exposure meter, for the subject may be the same size, or even smaller
than the cell window of the meter. The problem can be solved by first
arranging the lighting units for properly illuminating the subject, then
substituting for the latter a card which is approximately the same shade as
the subject. The exposure meter reading is then made of this card.
To insure that a well exposed negative is obtained, it i.s recommended that
a serie.sof exposures be given on each subject. At least three exposures
should be made: one, the exposure calculated; the second, double the calcu-
lated exposure; and the third, half of the calculated.exposurg,.For greater
insurance, a fir'e-exposurestrip is recommended, with in addition to the
exposures mentioned includes exposures representing four times and one-
quarter of the determined exposure. \When darkroom facilities are available,
single exposurescan be made and checked.
Film Choice: In close-up and copy work it is usually necessaryto reproduc,:
as fine detail a.spossible. This calls for the use of fine-grain films, since the
finer the inherent grain in the film, the greater is the ability of the film to
reproduce detail.
For this purpose the finer grain 31mm. films may be divided into two types:
a. Medium speed, fine grain films:-Examples of such films ate DuPont
Superior No. 1, Eastman Panatomic X, and Ansco Irinopan.
b. Slow speed, extreme fine grain films'-Examples of such films are East-
man Microfile, Ansco Minipan and DuPont Microcopy.
Iror general work the medium speed
films are recommended. They have good
latituCe and are capableof reproducing
\il7hen maps, charts, delicate gradations.
etc., are to be copied, in which case
"speed" of the film may not be essen-
tial, the slow speed films are recom-
mended because of their ability to re-
solve finc detail. In those cases wherc
only black and white charts, etc., arc
to be copied, positive film can be em-
1-,loyed.This film is ordinarily used to
make film positives from 35mm. nega-
tives. It is relatively cheaper in pricc
than negative film and can be employed
in copy work where no colored material
is to be copied.
In tho.secaseswhere moving objects
irre encountered, which would necessi-
tate relatively high shutter speeds, it
may be necessaryto use high speed films.
Figure 20. Locking pin on wire releose leoves hond
f ree for long exposures when shuller is operoled on
bulb selting.
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Figure 2l . Typicol sef-up for "Quiz" picfures. For this typ. of
work o smoll spollighf is ideol.View original page 26Page 27 · Read text
INTERMEDIATEFOCUSING MOUNT
The Intermediate Focusing Mount is a valued copying accessory,attaching
to the bayonet flhnges of the Leica 50mm. lenses, thus ensuring a rigid
mounting. It also prevents any possible distortion of the image due to the
slight lateral displacement of the lens, which may occur when the Leica
50mm, lens, attached directly to the Focaslide or the extension tube is
focused in its free position. The Intermediate Focusing Mount gives a wide
range of picture-taking possibilities. \When it is attached directly to the
Focaslide and the 50mm. Elmar or Summitar lenses, it makes possible the
photography of objects at distances from infinity to LrrA inches, from the
back of the camera to the object. A , x 7Vz-inch area is covered at the
closest distance. Still smaller areas are easily covered by inserting any of the
extension tubes between the lens and the Focaslide. The Intermediate Focus-
ing Mount gives ^ r'ariable extension of 7.5mm. and can be used as r
focusing aid for fine adjustments.
Figvre 22. Boyonet flonges of 50mm. lens ossembly engoge the boyonet colches of the
lntermediole Focusing Mount.
26
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-b
-/a
I
Figure 23. The compensoting ring is detoch ed when lens in the lntermediole Focusing Mount
is used of infinity.
the Intermcdiatc Irocusing Mor-rnt in a. counter-clockwisedircction. Attach
thc rnount, u'ithout thc iit'rg, directly to thc lens thrcad of the lrocaslide.
Turn focusing rnoLrntout for sliding clcarancethcn back to ProPcr setting.
2View original page 28Page 29 · Read text
OPTICAT SHORT DISTANCE
FOCUSING DEVICE
The Optical Short Distance-Focusing Device for the Leica enables the
automatic focusing of the Leica lenses to be utilized for close-ups under
3.5 ft. \7ith this device, all object distances between 3.5 ft. and l,6Yz in. to
the.plane of the film (back of camera) can be set with rapidity and accuracy.
One is not confined to some predetermined focusing distances (as with our
setting devices for the use with front lenses and intermediate collars), but can
set the lens continuously to ali distances between the limits quoted. The ratio
of image varies from 17.5 X to 6.3 \ minification, the size of object from
t6y2" x247/to" to 'Yr.o" X 8t/r,o" G2 X 63cm. to 15 X 221/2cm.). The
device consists of an intermediate helical focusing arrangement which
is screwed into the lens changing flange of the Leica. This accessoryhas an
optical glass wedge, which positions in front of the rangefinder window
pioviding the necessary deflection of the rays. A square stop which fits in
front of the viewfinder, which, by means of a cam movement, provides auto-
matic compensation for parallax, and the reduced field of view. Bayonet
catches in the optical short distance device engage the bayonet flange of the
lens when it is inserted. Onlv )Omm. lenses can be used and two models are
made, one to accept the Elmar 50mm. (Noorv) and the other for the
Hektor, Summar and Summitar )0mm. lenses (Noorv'nrsuu).
\When focusing with the device, only the middle of the field of the range
should be used.
OPTICAL NEAR. FOCUSING DEVICE
oMIFo is a near focusing device similar to Nootcv except that it offers a
fixed focus with a fixed ratio of L:4, covering approximately 4x6 inches.
It is designedto accommodatethe 90mm. Elmar f /4lens. This combination
affordsa greaterworking distancethan the 5Omm.lens usedwith the Nooky.
The device consistsof an intermediate mount which is screwed into the
lens changing flange of the Leica. In addition, the mount accommodates
optical wedges that position in front of both rangefinder windows, and a
diminished stop in front of the viewfinder window. This arrangement
pqovidesthe neiessarydeflectionof rays and permits critical focus, as well as
indicating the correct field of view. The lens must be focused at infinity.
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