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Bausch and Lomb lenses Product booklet
Product booklet for Bausch and Lomb lenses. 35 pages in English. Read the original PDF, download or print a copy without registration.
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- Bausch
- Model / document
- Bausch and Lomb lenses
- Document type
- Product booklet
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- English
- Pages
- 35
- File size
- 3.8 MB
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- Lenses & filters
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- Not specified in catalog
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Page 3 · Read text
THE
ANaSTIGMAT LENs
as an aid to
Anls'nc PHorocRApHy
BauscH & Lon4s Oplcat Co.
ROCHESTER, N. Y.
' NEWYORK, Broadway and 25th St. BOSTON, 120 Boylston St.
WASHINGTON, 606 l3thSt., N. W. CHICAGO, l56WabashAve.
SAN FRANCISCO,230 SutterSt
' LoNDoN. ENGLAND. FRANKFURTu/u, cERuaNy.
www.orphancameras.comView original page 3Page 5 · Read text
: _
The Rectilinear or Symmetrical lenses with which
hand cameras are ordinarily equipped are dlmost all manu-
factured by us and are the best lenses of their type, but
however perfect, they possessone inherent defect impossi-
ble to overcome, which necessarily limits their capabilities.
This defect is astigmatism which may be defined as
the inability to focus at the same time vertical and horizon-
tal lines lying in the same plane. While this may not be
especially important in a lens working at a small aperture
(diaphragm or stop) as we increase the aperture the defect
becomes more apparent, so that if we desire speed
in a lens, it must be as perfectly corrected for astigmatism
as is possible. As will be seen from the illustrations on
the following page, astigmatism shows itself in increasing
distortion and indistinctness of lines towards the margin.
The Anastigmat lens with its superior correction has
the following advantages over the older type, the Rectilinear
lens, which it is bound to supersede in all cases where the
increased cost is no bar to its purchase: it gives greater speed
because it may be used with full opening and the resulting
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Anastigmat RecrilinearLens image will be brilliant and
ffi ffi:11"':ll-Tj;i*0"il':
NXEIfIFIFffi ra.}rry H::,fiHJi:.:T#''" - ffi ffi * with full opening; it has
ffi #frFeNtrdw4#ffi greatere coveringpower, that
$ AfeA. inwhich the imageis
-*-:::::= *iM**ffiffiffiffiffiffiffiw= ****l;ij;:i"#:;
shows work the of a first- , .
class Thisn..ii1...;"1;;';;;;;a".,i;,t'""figure lens is valueless.@ffififtTffAnastigmat.on the test chart. The blurring r ._i'A;;;ii**iii'-iltfi+.tiii"""i'i""'.- Is it any wonderr that_r , ther
possessorof an ordinary lens, as he becomes aware of its de-
fects beginsto covet a modern Anastigmat ? And indeed *hy
should he wait until he discoversfor himself the disadvantages
of the Rectilinear lens ? Whv should not the prospective
owner of a photographic outfit start out with the very best, and
have all the advantages to be derived from the use of the
best available means to the ends he seeksto attain ) He
is bound to have a better lens than the Rectilinear he
starts out with, that is certain if he does anything at all in
photography. Whv pay for the Rectilinear and later the
Anastigmat also, when the latter will do all the work of the
former and more besides)View original page 6Page 7 · Read text
The Anastigmats herein set forth are unexcelled,
the formulae for all but one having been computed by
scientific experts in the Carl Zeiss Works at Jena, which
has long led the world in the production of optical
instruments and where the first Anastigmat lens was 'We
invented and put upon the market. are the sole
licensees for the production of these celebrated lenses in
America. They are made of Jena glass of absolutely per-
manent qualities, after precisely the same formulae, and are
subjected to exactly the same critical tests as in the Jena
manufactory.
If you are not already the possessor of one of these
peerlessAnastigmats we trust that a perusal of these pages
will convince you of their merits and incite in you a desire
to own one.
In addition to the goods heqein Iisted we manufacture
other lenses and shutters, telephoto-attachments and ray
filters. Thts is but an abrdged list of Anastigmat lenses
of our manufacture and u)hich are especiallg adapted for
use on hand cameras. Those interested are requested to
send for our complete catalog of Photographic Lenses and
Shutters (Catalog H).
We publish also a Portrait Lens Catalog and a Catalog
for Photo-Engravers, both of which are supplied on demand.
The goods listed herein may be obtained through
your photographic dealer.
BAUSCH & LOMB OPTICAL CO.
Rochester,N. Y.
July l, 1906.
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Bausch & Lomb-Zeiss Unar f=4.5
Series Ib.
The unar is an unsymmetricaldoublet ( one whose
parts can_not be used singly ) composed of four separated
lenses. It is very simple in
construction and is the fastest
lens in the Zeiss series herein
listed, having a speed varying
from three times as great in the
smaller, to four times as great in
the larger sizes, as the ordinary
lens with which the camera is
fitted.
4/r, actual size of 4 x 5 Unar.
About 48o of the field of view are utilized on the
particular plate for which each number is listed. The next
larger plate is well covered with intermediate stop.
APPLICATION.
On account of its great speed the lenses are necessarily
somewhat large but not sufficiently so to prevent use with
almost any one of the present types of hand cameras.
It is the lens to be chosen above all others
for depicting rapidly moving objects. It
enables one to make quick exposuresunder
unfavorable conditions of light and it, bv flfifiHreason of its speed, particularly adapted to the requirements
of portraiture and group work. Home portraiture claims
the time and attention of a large growing number who will
frnd the Unar a most admirable lens for that purpose.
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Bausch & Lomb-Zeiss Tessar f=6.3
Series IIb.
The Tessar is the very
latest type of Anastigmat lens,
and is the lightest one in the
Zeiss series. Like the LJnar
it is an unsymmetrical doublet
of four very thin lenses. The
front and rear combinations are
separated sufficiently to allow
the Volute and our other be-
6/z^rtuulsizeof4 x 5 Tessar. tween the lens shuttefs to be
properly fitted. Since it is unsymmetrical its parts can not
be used separately. Tessar's superiority is evidenced by the
following predominant characteristics:
Perfect corrections.
Sharp definition extending over a wide field.
Illumination of unusual uniformity.
Speed f-6.3.
APPLICATION.
The Tessar is the lens par excellence m ffi A
for all ordinarypurposes. El/ lilH
It is light and compactand particularly HlEr f{ Hadapted to use with hand cameras of fixed
extension for instantaneous work. While its speed is
less than the Llnar, it is still twice as fast as the ordinary
camera lens, hence equal to practically all requirements.
t l
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Bausch & Lomb -Zeiss Corr.r.rtible Prota, f=6.3
Series VIIa.
These lenses are designed to meet all the conditions of
univensal photography, being composed of two single,
perfectly corrected, Anastigmats,
of difTerent foci, which may be
used singly or in combination.
When the single elements have
different foci, the lens is coD-
vertible into three lenses of
diflerent foci, having a speed of
f-7 or f-7.7, which is almost
4/r, u.tu^l size of 4 x 5 Protar. twice that of the ordinary camera
'3lens. If we examine the C " set listed on page 21 , we
frnd that it is composed of three single combinations of
8%u, I lgiu", and l3%rr focus respectively,each having a
speed value of f- | 2.5, which is ample for instantaneous
work under ordinary conditions. Combining the B%,
and | | */rutt combinationswe secure a
doublet of 5Att equivalent focus
and(;a \ffitlH{T::*i : :"';'"*[il- -:j' :it;?,
a speed of f-7.7 ; combining B %tt and l3%rr, w€ secure
an equivalent focus of 6%tt and a speed of,f-7.7; combin-
ing | |",\ull and l3%ll we secure an equivalent focus of 7tl
with a speed of f-7. These speeds are almost twice that
of the ordinary camera lens.
l 5
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While rated to cover perfectly plates of 4% *6%, 5x7,
and 5 x 8, they possess image circles sufficient to cover
plates the next size larger. As we secure from three single
combinations six perfectly corrected anastigmat lenses, the
enormous advantages of this Convertible series are at once
apparent. In selecting a lens one must be sure that the
baclc focus of no combination is longer than the greatest
extension of which the bellows is capable.
APPLICATION.
The single elements, while not absolutely rectilinear,
are unequalled, and being of longer focus than the double
combinations may be used for portraits, groups containing
large figures, landscapes,all purposes in short requiring long
focus, medium speed and narrow angle. Its use in taking
landscapes from a considerable distance makes it possible
for us to look upon the single combination as in a way a
telephoto lens, but while its magnification is less than the
telephoto its speed is far greater.
The doublet is an extra rapid lens working at a speed
twice as great as the ordinary Rectilinear, hence is adapted
for all kinds of instantaneous work, for groups, and for
architecture, and all subjects requiring medium angle, good
covering power, depth of focus and brilliancy.
l 7
www.orphancameras.comView original page 19Page 25 · Read text
Bausch & Lomb Plastigmat f=6.8-
The Plastigmat lens is our own creation. All the
Zeisslensesare unsymmetrical(the combinationscan not be
used singly) with the exception
of the Zeiss Convertible, and
it was the demand for a sym-
metrical Anastigmat lower in
price than the Zeiss Converti-
ble which prompted us to
compute this lens and place it
on the market. The lens is
Actualdze4x 5 plastigmat. produced under precisely the
same conditions and is subjected to the'very same tests as
all our other Anastigmats.
It is a symmetrical lens, the front and back combina-
tions being composed of four lenses each. Its speed is only
Yg less than the Tessar and the Convertible Protar, and is
almost twice as great as the ordinary Rectilinear. The
separate systems show great covering power. The rear
combination can be used at a speed oI f- I 3 .5 . one half as
great as the ordinary Rectilinear. The focal length is
nearly twice that of the lens when used as a doublet so
that one can obtain images twice the size at the same
distance, or the same size at twice the
distance. The two systems are far
enough apart to admit our Volute and
other between the lens shutters- The
plates for which the different numbers ffiffiare listed are completely covered at full opening.
23
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APPLICATION.
The Plastigmat is an admirable lens for general pho-
tography. Its excellent optical properties, light weight and
compact form, adapt it for use with the hand camera. Its
speed, not quite so great as Tessar, but suffrcient for all
exce,pt the most rapid work, crisp definition over a large
circle, great cooering poaer and eoen illumination, -"Le
it highly desirable for all classesof work.
What users of the lens think of it, is evidenced by the
following extract from a letter recently received:
-"lt gives me pleasure to give you an unsolicited testimonial
regarding your Plastigmat Lens. Some time ago I was persuaded to
purchasealso,.a lens of foreign make. Howevir, I beg leave to say
that the Plastigmatis superior in every wav. I came to this conclusion
only. after long-and careiul trials, ani my'testimonyis based on actual
resultsthus obtained. The Plastigmatgivesbetter definition,flatter field,
more speed, in short, compared point with point, your lens is far
superior in my estimation,to this much talked about, widely heralded,
but over estimatedproduct of a foreign country.
. -l wish you- i1l 5uc_cessand p?osperity in your efiorts to give to
America lensesof the highest grud..
verY trulY'
c. F. FISHER,
Pastor First CongregationalChurch, Clinton, Iowa."
ze of Plate Covered Sharply at
Equiva"
lent DiamTelegraphic )ter a Focus Code
of Lens,
Doublet I-6.8. f-82.
Plastal I 5+ 3 I x 4 1 x 5 x 7 I 7atPlastefto 2 6+ 4 x 5 x 5 x 8
Plastica 3 I stu 7+ 5 x 7 x 7 x 9
Plastos 4 r* 8* 5 x 8 l * 8 8 x l 0Plastum 5 r* l l 6 l x 8 * x l l 0 x 1 2
Focusing scale for any Plasr.igmat,50 cents.
When ordering lenses fittcd with shutter, by telegraph, specify
Volute in addition to-the code word for the size of ih" I"ilr.'
25
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SUMMARY.
To sum up briefy the leading characteristicsof the
Iensesdescribedherein:
The Unar has the greatestspeedand hence is neces-
sarily larger than slower lenses with which it might be
compared. Its speedadaptsit to the most rapid snapshots,
instantaneouswork of all kinds, portrait and groups,and it
givesfull exposureunder unfavorableconditions,when lenses
of less speed would fail. With reduced aperture (dia-s phragm or stop) and therefore lessenedspeed it is well
suited to landscapework as well as the purposes of the
other lenres. It has, therefore, the value of other lenses
with the additionaladvantageof speed.
The Tessar is the lightest and most compact of the
lenses. It is slower than the LJnar, but twice as fast as the
ordinarycameralens. It possessesremarkabledefinition and
covering power which render its use particularly advan-
tageouson large platesand for enlargements.
The Convertible Protar combinesin itself nearly all the
advantagesof all the other lenses. In speed it is equal to
Tessar. Its bulk is necessarilygreaterbecauseof the number
of lenses. In its single combinationsand as a doublet it is
adapted for all classesof work. The rear combinationgives
an image | % times,and the front combination twice, as
large as the doublet.
The Plastigmatis not quite so rapid as Tessar,7o l.ss,
and it is not so light. It has however the advantage that
www.orphancameras.comView original page 29Page 31 · Read text
By J. H. McCorkle.
'Where
its rear combination can be used. the single com-
binations of the convertible Protars have a speed oI f-|2'5,
those of the Plastigmat work at f- I 3 .5 , a speed somewhat
less but still ample for instantaneousexposures under normal
conditions.
It should be remembered that to use the single colrl-
binations of the Protar it is necessary to have a bellows
draw equal to the focal length of the front combination,
while those of the Plastigmat require a bellows draw equal
to a little more than twice the focal length of the lens.
Bv J. H. M"Co.Ll".
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Bausch & Lomb Volute Shutter.
Theoretically and practically the proper place for a
shutter is at the diaphragm point of the lens. An Iris
diaphragm operung and
closing at that point,
g i v e s t h e m a x i m u m
illumination uith the
minimum motion, abso-
lutely uniform exposure,
and an increase in the
depth of focus, covering
poDer and definition of
the lens, with no distor-
tion of the image, the
entire picture impressing itself upon the plate from the
moment the shutter begins to open until it closes. The
Volute representsthe highest type of diaphragm shutter.
It is rapid, compact, convenient, durable, dust-proof
and elegant. It gives bulb and time exposures and works
automatically at varying speeds very closely approximating
from 3 seconds to 1/tso, Ytoo, and 7r'zs second re-
spectively in Nos. | , 2 and 3. All speeds are controlled
by our patent pneumatic retarding device.
Any size opening from smallest to largest stop is
obtained by placing the lower pointer opposite the stop
number desired. It does not expose the plate while being
set, and can be arranged for use with two or more lenses.
3 l
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CADBY BROTHERS
. P}IOTOCRAPHICMATERIALS
222 Bleecker Street
UTICA, N, Y.
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