Lenses & filters
Pentax SMC lenses User manual
User manual for Pentax SMC lenses. 38 pages in English. Read the original PDF, download or print a copy without registration.
38 pagesEnglish5.1 MB PDF
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Document details
- Brand
- Pentax
- Model / document
- Pentax SMC lenses
- Document type
- User manual
- Language
- English
- Pages
- 38
- File size
- 5.1 MB
- Category
- Lenses & filters
- Document date
- Not specified in catalog
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Page 2 · Read text
CONTENTS Handling lenses 4 Diaphragm types 6 Lens hoods 10 Filters ......16 Focusing wide-angle lenses . . . . . . 20 Telephotolenses ..22 Macrolenses .....25 Zoom lenses .....26 Depth-of-fieldtables ...... 28 Depth-of-fieldtables ...... 32 Focusing shift for infra-red film . . 34 Lenscare ..35 Warrantypolicy ..36 Specifications .....38View original page 2
Page 4 · Read text
All SMC Pentax lenses @, except for ing one) attached; in this case, the the 1000mm and 135 - 600mm zoom focusing ring has to be set at infinity tolenses, are supplied with a leather lens minimize the length of the lens. When case @ and a shoulder st;'ap @. The the lens has been removed from theshoulder strap offers you the con- camera body, place it front-element venience of carrying the lens case over down as shown in Fig. 1. Don't place your shoulder. lf the lens case is to be the lens on its side because it may roll. kept in a camera bag, it may be more Never place the lens rear-element convenient to take off the shoulder down, for to do so may cause damage strap. to the protruding automatic diaphragm In addition, the SMC Pentax lens is lever or may cause the lens to topple furnished with a lens cap @ and a rear over. lens cap @, both of which protect the A standard lens, when removed from lens from dust, dirt and moisture; be the camera body, should be kept in a sure to keep these caps on the lens, standard lens case for protection. This while not in actual use. lt is a good case is available as an optional ac- practice to place these caps, whenever cessory.., removed from the lens, in the leather Be careful never to touch the lens sur- lens case so that they will not be lost. face with your fingers. Lens stains such The lens case is large enough to hold a as fingerprints are difficult to wipe off . lens with a filter (except for a polariz-View original page 4
Page 7 · Read text
www.butkus.us
Choice of apertures
A) The following are examples of
when photographers prefer to use
their lens at its maximum aperture
("wide-open"):
1 When photographing in dim
light
2 When desiring to use as short
("high" or "fast") a shutter
The first half-click-stop of lenses with a speed as possible
non-standard maximum aperture 3 When desiring minimum depthThe cf ick-stop between tl4 and t12.5 ot of field
the SMC Pentax 135mm f/2.5 lens 4 When desiring to exploit the at-
(Fig. 4) represents t13.4, and the click- tractive appearance of out-of-stop between f/5.6 and f/3.5 of all focus high lights
lenses with a maximum aperture of B) SMC Pentax lenses have a minimum
f/3.5 (Fig. 5) represents f/4.8. aperture of tl22 or smaller.
The white dot between 4.5 and 8 on The following are some examples of
the aperture ring of the SMC Pentax 85 when the minimum aperture is use-
- 21Omm zoom lens represents f/5.6. ful:
1 When using fast film and/or the
subiect is extremely brightView original page 7Page 8 · Read text
2 When desiring to use as long
("low" or "slow") a shuttgr
speed as possible
3 When desiring maximum depth
of field
C) Some uses of the moderate aper-
tures of t15.6,8, and 11 follow:
1 When desiring optimum resolu-
tion and contrast
2 When simultaneously desiring
both sufficient depth of field
and short enough a shutter
speed to match the require-
ments of most photographic
situationsView original page 8Page 10 · Read text
SMC Pentax 55mm f/1.8
" 55mm f /2 (b)SMC Pentax 29mm f /2
f l2'B " 3omm (3) S8mm
SMC Pentax Llnn'/,tr
Because of the rectangular picture
format, rectangular lens hoods are bet-
ter suited to 35mm cameras than
round hoods. However, to avoid the
possibility of vignetting, care should be
taken to assure that the hood is not off
axis, but that the top and bottom of
the hood are parallel to the top and
bottom of the camera. Like lens caps,
rectangular lens hoods are held in place
by means of a spring, and are attached
to the front threads of the lens by
depressing the knobs €. on either side
of the lens hood (see Fig. 7).View original page 10Page 13 · Read text
www.butkus.us
Built-on Hoods cated, because this may result in
vignetting; this is especially true with
Built-on hoods are fixed on the fol- wide-angle lenses. For example, a rec-
lowing telephoto and ultra telephoto tangufar hood for the 24mm t12.8,
lenses: 28mm f 12 and 30mm f/2.8 lenses can
be used with a standard lens. However, SMC Pentax-M 135mm f/3.5 the hood for a standard lens should not SMC Pentax 300mm f/4 be used with a wide-angle lens.
Any lens hood can also be attached to
5O0mm f/4.5 a filter (except for a polarizing filter).
" "l0OOmm f/B The hood for the SMC Pentax Zoom
', Toom135-600mmf/6.7 45 125mm f/4 lens consists of two - u n its.To use this type of hood, simPlY ex-tend it. When both a filter and the lens hood are to be simultaneously used together,
Notes: a 67mm filter has to be screwed into
A lens hood can be used with a lens the lower frame of the hood; then the
which has a focal length longer than upper frame is screwed into the filter.
that indicated on the hood, though in The SMC Pentax-M Macro 50mm f/4
such a case its effectiveness will be lens has its front lens element so far
reduced. On the other hand, a hood retracted that it requires no lens hood,
should never be used with a lens of except on those occasions filters are
shorter focal length than that indi- used.View original page 13Page 14 · Read text
Standard Lens Hood A 67mm filter @ being screwed into
the lower frame of the hood @ for the
SMC Pentax 45 - 125mm Zoom lens.
I 10
www.butkus.usView original page 14Page 17 · Read text
www.butkus.us
Built-in Filters
Filters are built into the SMC Pentax The Fish-Eye 17mm lens has four
Fish-Eye 17mm f 14 and SMC Pentax built-in filters: UV, Skylisht, Y2 and
15mm f/3.5 lenses. In the case of the 02, which are brought into play by
Fish-Eye, this is because the lens has a turning the front ring @. In addition, wider angle of view than a filter and this lens has a non-colored (NONI
using a filter would cause vignetting, In optical glass flat which should be sub-
the case of the 15mm f/3.5. its front stituted for the UV filter when color
frame diameter is too large to accept reversal film is used.
an ordinary filler.
11 12 13
'*{
Digitally signed by Mike Butkus
DN: cn=Mike Butkus, o=Butkus camera manuals, ou=butkus.org,
email=mike@butkus.org, c=US Mike Butkus Date: 2023.10.02 16:08:38 -04'00'
t8View original page 17Page 18 · Read text
For other filters, gelatin types can be Filters for Ultra Telephoto Lenses
used as follows: Remove the filter The 500mm f14.5, 1000mm f/8 and
holder @ from the back of the lens Zoom 135 - 600mm f/6.7 lenses haveby turning it counterclockwise as seen threads on the back which accept
in Fig. 12. Next, as seen in Fig. 13, a 52mm filters. lf these lenses were to
gelatin f ilter @ is cut into a circle and use filters in the front, they would be
inserted under the spring of the holder. exceptionally large, in size and weight,
and would be more expensive to manu-
facture.Gelatin f ilters can also be used with the
SMC Pentax Shift lens by slipping a SMC Filtersf if ter, cut to the appropriate size, SMC filters are available in Skylight,under the gelatin f ilter clip built onto UV, Y2, 02, R2 and Cloudy. They arethe rear of the lens. Super-Multi-Coated to minimize reflec-
tion and are recommended for use with
all Pentax K Series cameras.
Caution: The filter forms part of the
optical system of the
camera. Handle it with the
same care you show the lens
itself.
t9View original page 18Page 19 · Read text
FOCUSING WIDE.ANGLE LENSES www.butkus.us
14-1
When the lens-to-subject distance is
constant, the shorter the focal length,
the greater the depth of field. Compare
the 50mm f/l.4 lens in Fig. 14-1 with
the 28mm f/3.5 lens in Fig. 14-2, and
you will see how great the depth of
field difference is between the two
lenses. The smaller the depth of field,
the easier it is to focus the lens. Therefore, you will find it more dif- I
ficult to focus a wide-angle lens by
looking through the viewfinder than to14-2
focus a standard focal length lens. U However, on the plus side, even when
using a 35mm lens (which has the
shallowest depth of field of all the
wide-angle lenses), everything from
1.5m to 3m is in focus when the lens is
set to 2m and f/5.6, for example. Thus,
the extensive depth of field of wide-
angle lenses often makes it unnecessary
to focus the lens while looking through
the viewfinder.View original page 19Page 20 · Read text
Convenient fixed-focus marks for
shooting snapshots are provided on the
SMC Pentax wide-angle lenses. They're
shown as red figures on the diaphragm
and distance scales. lf you align these
figures with the index mark, you do
not have to turn the focusing ring
every time you want to shoot. The
I diaphragmphoto {Fig.is 15}set atindicatesf/8 andthatthe distancethe lens
scale at 3 meters. Read the depth of
field scale, and you will see that this
setting a{fqrds sufficient focusingI sharpness from 1.5 meters to infinity.View original page 20Page 21 · Read text
TELEPHOTO LENSES www.butkus.us
16
Blurry photos are often due to camera
movement when the shutter is released.
When using a telephoto lens, pay
special attention to the way you are
holding the camera. Because of the
greater length, size and weight and the
fact that the center of balance is
farther forward, it is even easier for
the shutter release to cause the camera
movement.
As shown in FiS. 16, when using a
telephoto lens, the best posture is: left
hand extended and supporting both
the lens and the camera body, with the
thumb and index f inger used to rotate
the focusing ring. Both elbows should
be pressed close to the body, with the
upper arms hugging the ribs. lf you
wear glasses, press them tightly to the
frame of the viewfinder window.
azView original page 21Page 22 · Read text
Minimum shutter speed for hand- Telephoto lenses whose aperture set-
holding the camera ting cannot be seen in the viewfinder of
When using a telephoto lens for hand- Pentax MX and KX.
held camera work, you should select a Since the diameter of the aperture ring
shorter shutter speed than you might of the SMC Pentax 400mm t15.6,
when using a standard lens. The shutter 500mm t14.5, 1000mm f/8 and SMC
speed which is short enough to prevent Pentax Zoom 135-600mm f16.7 is
camera movement is said to be 1 ltocal comparatively large, and the location
length. For example, when using a of the aperture ring is different, the
135mm lens, you should use a shutter aperture settings cannot be seen in the
speed of 1l'135 sec., with a f00mm viewf inder of I\4X and KX.lens, you should use a shutter speed of Mirror lock-up1l2OO sec., or the nearest equivalent. The Pentax K2 and KX are equipped you experienceOf course, with is lock-up. mirror will with lf the subjectprobably be shut- use a longer able to camera you can minimize stationary,ter speed and still obtain sharp pictures movement by releasing the shutterwithout using a tripod. after locking up the reflex mirror.
23View original page 22Page 24 · Read text
MACRO LENSES
When the magnification index @ in-
dicates '4', it means that the image on 18
the film is 114 as large as the real
object. For macrophotography, simply
set the desired magnification on the
index and then focus by moving the
entire camera back and forth. When
using an SMC Pentax-M Macro lens no
particular exposure determination is
required. For exposure, you can
Cepend on the meter built into the
Pentax cameras. You also need not
worry about exposure increase factors
for close-up work.
Life-size magnification. is possible with
the SMC Pentax-M Macro 50mm f/4
lens when it is combined with the No.
3 Auto Extension Tube K, and with
the SMC Pentax Bellows 100mm f/4
lens when it is used with the No. 1, 2,
& 3 Auto Extension Tubes K. www.butkus.us
25View original page 24Page 26 · Read text
SMC Pentax Zoom lenses have neither a depth-of-field scale nor an infra-red index. When checking the 45 125mm tl4, 85 - 210mm f/3.5 orf14.5 lens for focusing sharpness or using them for infra-red photography, see pages 32 and 33. By nature, zoom lenses give rise to slightly greater distortion (alterations in the shape or proportion of objects) than f ixed focal length lenses. This dis- tortion varies according to the focal length of the lens. The zoom lens is, therefore, not recommended for situa- tions where proportional accuracy is crucial.View original page 26
Page 33 · Read text
FOCUSING SHIFT FOR INFRA.RED FILM www.butkus.us
Note:
The focusing shift must be taken into
account only when working with black
and white infra-red film, for color in-
fra-red. focus as usual.
SMC PENTAX ZOOM 85 - 210mm t/4.5
SMC PENTAX ZOOM 45 - 125mm tl4
45
50--
60-
70
60-
00-
@r
| |25 ,,iIView original page 33Page 34 · Read text
or alcohol. Wipe in a spiral pattern,
from the center out. For larger lenses, ,ffi, wrap the tissue or cloth around the tip
of your finger instead of a matchstick.
Be sure to shift the cloth or paper
#dd$% " .' + frequently, to avoid wiping with a
dirty part. A few wipes over any
stained part of the lens should remove
the stain. However, if the lens stains / cannot be removed this way, take theLENS CARE lens to an authorized Pentax Service
Do not use or store a lens in an ex- Center for professional servicing.
tremely damp location, especially Moisture and dust are not the only
where it might be liable to damage by things which might damage a lens.
salt spray. lt is an excellent practice to Heat, shock and scratches can also be
protect the lens with a filter, not only harmful. Be very careful not to bump
at the seashore, but also anywhere that or drop the lens, and never put it in its
dust or moisture is present. lf the lens case without its protective caps. The
becomes dirty, do not wipe it with a wicest practice is to put both the front
handkerchiet, for it may scratch the and rear caps on the lens as soon as it is
surface. Instead, blow away the dirt removed from the camera. lf the lens is
with a rubber blower and soft brush. not used for some time, especially
lf you touch the lens surface by ac- during humid weather, it should be re-
cident, or if it is too dirty to clean with moved from its case at regular intervals
the blower, use soft tissue paper or and checked for mildew. lf any damp-
very soft cloth, wrapped around some- ness is present, thoroughly dry the
thing like a matchstick. This can be case. Light mildew can easily be wiped
dampened with lens cleaning solution off. 35View original page 34Page 35 · Read text
WARRANTY POLICY www.butkus.us
All Asahi Pentax lenses purchased any kind, whether caused by defective
through authorized bona fide photo- material or workmanship or otherwise;
graphic distribution channels are and it is expressly agreed that the lia-
guaranteed against defects of material bility of the manufacturer or its re-
or workmanship for a period of twelve presentatives under all guarantees or
months from date of purchase. Service warranties, whether expressed or im-
will be rendered and defective parts plied, is strictly limited to the replace-
will be replaced without cost to you ment of parts as hereinbefore prbvided.
within that period, provided the equip-
ment has not been abused, altered, or
operated contrary to instruction. Be-
cause the tolerances, quality, and PROCEDURE DURING 12-MONTH
design compatibility of lenses other WARRANTY PERIOD
than Pentax lenses are beyond our con- Any Asahi Pentax lens which proves
trol, damage caused by use of such defective during the 12-month war-
lenses will not be covered by this war- ranty period should be returned to the
ranty policy. The manufacturer or its dealer from whom you purchased the
authorized representatives shall not be equipment or to the manufacturer. lf
liable for any repair of alterations ex- there is no representative of the manu-
cept those made with its written con- facturer in your country, send the
sent and shall not be liable for damages equipment to the manufacturer, with
from delay or loss of use or from other postage prepaid. In this case, it will
indirect or consequential damages of take a considerable length of time be-
36View original page 35Page 36 · Read text
fore the equipment can be returned to procedure and warranty policy. In any
you owing to the complicated customs case, however, shipping charges and
procedures required in Japan in im- customs clearance fees are to be borne
porting and re-exporting photographic by the owner. To prove the date of
equipment. lf the equipment is covered your purchase when required, please
by warranty, repairs will be made and keep the receipts or bills covering the
parts replaced free of charge, and the purchase of your equipment for at
year. your a Before sending equip-
please servicing, make for surei uponequipmentcompletionwill beof returnedservicing.tolf youthe mentleast
i equipment is not covered by warranty, that you are sending it to the manufac-
I regular charges of the manufacturer or turer's authorized representatives or of its representatives will apply. Ship- their accredited repair shops, unless
ping charges are to be borne by the you are sending it directly to the
owner. lf your Asahi Pentax lens was manufacturer. Always obtain a quota-
purchased outside of the country tion of the service charge, and only
where you wish to have serviced during after you accept the quoted service
the warranty period, regular handling charge, instruct the service station to
and servicing fees may be charged by proceed with the servicing.
the manufacturer's representatives in This warranty policy does not apply to
that country. Notwithstanding this, Asahi Pentax lenses purchased in the
your Asahi Pentax camera or lens re- U.S.A. For these lenses, please refer to
turned to the manufacturer will be ser- the separate Warranty Policy Card en-
viced free of charge according to this closed here.
37View original page 36From the M. Butkus archive. Original publisher and archive notices are retained.
Check the model and edition against your equipment.
PDF verified 2026-10-10.