Honeywell Pentax Spotmatic IIa User manual

HONEYWELL PENTAX
SPOTMATIC Ila*
\
OPERATING MANUAL

Index
Introduction.
Major working parts of the Honeywell Pentax Spotinatic Ila
Specifications.
Short operating course.
How to hold your camera.
Film loading.
Film wind and rewind.
Bright field focusing .
Microprism .
Automatic diaphragm.
Shutter.
Depth-of-field guide.
Depth-of-field tables.
Range of light measurement.
Mercury battery .
Flash synchronization.
Strobo-eye remote sensor.
Important notes.
Self-timer.
Infra-red photography.
How to make deliberate double exposure
Difference of angle of Takumar lenses.
Takumar interchangeable lenses.
Specifications of Takumar lenses.
Complete system of Honeywell Pentax accessories
for close-ups, macrophotography, photomicrography
and other miscellaneous accessories
Spot exposure meter III.
Honeywell Pentax warranty policy.
1
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25
34
35
41
44

HONEYWELL PENTAX
SPOTMATIC Ila
Your Honeywell Pentax Spotmatic ITa is the most advanced photo¬
graphic tool on the market today.
With its unique Strobo-Eye you have the capability for automatic elec¬
tronic flash ... off camera or on ... bounced , or direct... from 2' to 40'
... with a choice of f/stops.
There is no comparable system.
The Super-Multi-Coated Takumar is an unbeatable lens. The Super-
Multi-Coated Takumar reduces flare and boosts contrast to a degree far
beyond what was previously possible in optical technology. It is a tougher
coating than is available on any competitive lenses and results in pictures
with more detail and richer colors than is possible with any other sys¬
tem at any price.
The Spotmatic Ila itself is an outgrowth and refinement of the original
Spotmatic which introduced through-the-lens metering to the world of
photography. Its stopped-down metering system is the most accurate
method for perfect exposure determination. It also automatically gives
you a depth-of-field preview. It is an averaging system for the easiest
and most dependable exposures in typical picture-taking situations. This
metering system has been refined and improved each year in the Spot¬
matic to a degree of accuracy unmatched in the industry.
The original Spotmatic was the most compact 35mm SLR made. The
Spotmatic Ila retains that same traditional compactness and classic feel.
It also is designed for use with the accessories from the Pentax system, in¬
cluding all of the superb Takumar lens ranging from the ultra-wide-angle
17mm Takumar up to the super-telephoto 1000mm Takumar. The Pentax
system can grow with you as your interests develop in any direction.
This is today's most advanced photographic system. Its unique auto¬
matic electronic flash capability, its superior Super-Multi-Coated Taku¬
mar and classical Pentax body make this a camera we are very proud
to market.
We are sure you will be just as proud to own it.

A — Self-timer cocking lever
B — D-ring lug
C — Shutter release
D — Shutter speed dial
E — Shutter speed index
F — Hot shoe flash contact
G — Hot shoe
H — Film rewind crank
I — Film rewind knob
J — Strobo-Eye sensor
K — Exposure meter switch
L — Preview lever
M — FP flash terminal
N — X flash terminal

Honeywell Pentax Spotmatic I la
O ~
P -
Q-
R -
S -
T -
U -
Distance scale
Diaphragm and distance index
Diaphragm ring
ExjTOSure counter index
Automatic reset exposure
counter
"Cocked” indicator
ASA film speed setting
V — Rapid wind lever
W — F/stop scale
X — F/stop index
Y — ASA scale
Z — ASA index
AA — Range indexes
BB — Depth-of-field guide
CC — Focusing ring

Specifications
Type
35iTim single-lens reflex with built-in light meter.
Film and Picture Size
35mm film (20 or 30 exposures). 24mm x 36mm.
Standard Lenses
Super-Multi-Coated Takumar 50mm f/1.4 or 55mm
f/1.8with fully automatic diaphragm. Filters and
lenshood size: 49mm. Equipped with diaphragm
preview lever which affords visual check of depth
of field. Distance scale: 18' (45cm) to infinity.
Shutter
Focal plane shutter, with single non-rotating dial.
Speeds: B, 1 — 1 /1000 sec. Film speed (ASA) setting
dial and window on shutter speed dial. Built-in
self-timer releases shutter in 5-13 seconds. Shut¬
ter curtains of special rubberized silk.
Warning Signal
The index of shutter speeds turns to red when the
shutter and film speed settings are off the meter’s
measurability range. Refer to page 20.
Finder
Pentaprism finder with microprism Fresnel lens
for instant focusing; 0.88 X magnification with 50
mm lens and approximately life-size with 55mm
lens.
Focusing
Turn the distance scale ring until the subject image
on the ground glass comes into focus.
Reflex Mirror
Instant return type with special shock absorbers
for minimum vibration.
Film Advance
Ratchet type rapid wind lever (for film advance
and shutter cocking). 10’ pre-advancing and 160°
advancing angle.

Lens Mount
42mm threaded lens mount.
"Cocked” indicator
A red disk appears in a small window alongside
the shutter release button when the shutter is
cocked, and blacks out when it is released.
Film Exposure Counter
Automatic re set type.
Flash Synchronization
Equipped with FP and X flash terminals. Elec¬
tronic synchronization at 1/60 sec.
Exposure Meter
Built-in meter measures the brightness of the
ground glass, and couples directly to shutter and
film speed settings. Film speed (ASA) setting
ranges from 20 to 3200 (LVl-28 for ASA-100 film
with standard lens). Mefer is powered with a
mercury battery.
Film Rewind
Rapid rewind crank for speedy film take-up. Film
rewind release button on bottom of camera body
rotates while film is being rewound.
Strobo-Eye Electronic Flash Sensor
Built-in sensor measures reflected light from Stro-
bonar. Film Speed (ASA) setting ranges from 25
to 400. Selection of f/stop setting gives depth-of-
field and/or range.
Strobo-Eye Sensor Measuring Angle
12 degrees.
Dimension
Width S.S" (143mm) x height 3.66" (93mm) x
thickness 3.4* (88mm).
Weight
1 lb. 11 oz. (853 grams) with 50mm f/1.4 lens.
Body alone: 1 lb. 4 oz. (622 grams).

Short operating course
A mercury battery for the light meter is packed separately. Please be
sure to insert it into the battery housing before operating the camera.
For battery insertion, refer to page 16.
1. S ET FILM SPEED
Lift the outer ring of the shutter speed dial,
and rotate to set the ASA number of the
loaded film to the small red index which
appears alongside the figure 1. Then cock
the rapid wind lever.
2. S ET SHUTTER SPEED
Turn the shutter speed dial and set the speed
you wish to use to the index. When out¬
doors, set the speed at 1/125 sec. or faster,
depending upon the lighting. When indoors,
set it at 1/30, or in its neighborhood. Change
the shutter speed later, when necessary.
(Refer to instruction 5, page 7.)
3. C OMPOSE AND FOCUS
While viewing through the viewfinder, turn
the distance scale ring with your thumb and
index finger until you get the sharpest image
of your subject at the microprism center of
the finder.

4. T URN ON LIGHT METER SWITCH
Push up the switch button with your thumb.
Through the viewfinder, you will observe the
movement of the meter’s needle on the right
side of the ground glass. Be sure to turn off
the meter’s switch when not actually taking
readings.
5. ROTATE DIAPHRAGM RING
The needle moves up and down with the turn
of the diaphragm ring. When the needle rests
at the centre, you will get correct exposure.
If the needle does not come to the center no
matter how far you turn the diaphragm ring,
change the shutter speed. When the needle is
off center and close to the (+) mark, you will
get over-exposure: change the shutter speed
to a faster setting. If the needle is closer to
the (—) mark, you will get under-exposure:
change the shutter speed to a slower setting.
6. RELEASE SHUTTER
Hold your camera firmly and trip the shutter.
When the shutter is released, the meter switch
will automatically turn off, and the needle
will drop to the "OFF” position below center.
The diaphragm will reopen to its full aperture
and the overall image will look brighter. Cock
the rapid wind lever for the next picture.
(When taking a series of pictures under the
same lighting conditions, it is not necessary
to repeat instructions 4 and 5.;
7. S ET STROBO-EYE FOR ELECTRONIC
FLASH
Pull up the rewind knob. Set the ASA num¬
ber of your film opposite the ASA index.
Turn the outer dial to position the ASA in¬
dex opposite the desired range mark. Set
your lens to the f/stop indicated by the f/
stop index. Refer to page 18.
7

How to hold your camera
In horizontal position A. Hold
the camera firmly with your
left hand, and draw your arm
close to your body.
In vortical position B. Hold
your camera tightly to your fore¬
head with your left hand, and
draw your right arm close to
your body.
In vortical position C. Hold
your camera tightly to your fore¬
head with your left hand, raise
your right arm and draw your
left arm to your body.
As a genera] rule, your camera should
be held more firmly by the left hand
which does not release the shutter.
If you hold your camera with the
right hand—the hand which releases
the shutter — it may cause camera
movement. Very often, pictures
which are not sharp are due to move¬
ment of the camera. When you focus
with the camera held horizontally
(Position A), hold the lens barrel as
illustrated in photograph. Put the
camera on your left hand thumb and
little finger. Turn the distance scale
ring with your thumb and index
finger. When holding the camera
vertically, some people release the
shutter with the thumb (Position B),
while others release it with the in¬
dex finger (Position C). Position C
is more desirable for fast focusing
and shooting. With the Honeywell
Pentax, whether held vertically or
horizontally, you see your subject
image through the taking lens, ena¬
bling you to compose, focus and shoot
with a minimum of time and effort.

Setting ASA film speed
The ASA film
speed rating of all
35mm films is
given in the data
sheet packed with
each roll of film.
The higher the
ASA number, the
more sensitive the
film. Lift the out¬
er ring of the shutter speed dial and
rotate it until the ASA number of
your film is opposite the red index
mark.
Be sure to set your film speed on
the shutter speed dial because the
dial is connected to the exposure
meter system.
Film loading
Avoid direct sunlight when loading your
film.
1. Open the back by pulling out the
rewind knob until back cover snaps
open.
2. Place the film cassette into the cas¬
sette chamber, and push back the re¬
wind knob. Draw out the film leader
and insert it into slot of the take-up
spool.
3. Advance the film by alternately turn¬
ing the rapid wind lever and releas¬
ing the shutter until both sprockets
have properly engaged the film per¬
forations. Close the back by pressing
it firmly.
4. If the film is properly loaded, the re¬
wind knob will turn counter-clock¬
wise when you advance the film by
turning the rapid wind lever.
Setting Strobo-Eye
When you have pulled out the rewind
knob to load your film, turn the inner
dial until the ASA number of your
film is opposite the ASA index.
Turn the outer dial until the ASA
index is opposite the range mark de¬
sired and note the f/stop reading in¬
dicated by the f/stop index. A total
range of 3 f/stops is available for
each film speed.

Film wind and rewind
1 T he first portions of the film can¬
not be used for picture taking as
they have already been exposed
to light. Generally, two blank ex¬
posures should be made before
taking your first picture. Cock
the rapid wind lever until it stops.
Watch to see that the film rewind
knob automatically turns coun¬
ter-clockwise, indicating that the
film is moving from cassette to
take-up spool. Trip the shutter.
Cock the rapid wind lever for
the first picture; the exposure
counter automatically turns to
indicating that the first pic
ture is ready to be taken.
2 After the final picture on the
roll (20 or 36 exposures) has been
taken, the rapid wind lever will
not turn all the way as you stroke
it. This indicates that the final
picture has been taken on your
him, and that the film must be
rewound. DON’T open the back
of the camera, or all exposed
frames will be ruined.
3 Unfold the film rewind crank.
4 Depress the film rewind release
button. Turn the rewind crank
to rewind the film into the film
cassette. The film rewind crank
permits rewinding at a smooth,
even rate. (Under some atmos¬
pheric conditions, erratic or too
rapid rewinding will cause static
electricity marks on the film.)
You will feel the tension on the
rewind crank lessen as the leader
end of the film slips off the take-
up spool.
Stop rewinding when you feel
this happen. AVOID DIRECT
SUNLIGHT WHEN UNLOAD¬
ING YOUR FILM. (The rewind
release button will return to
normal position as you load your
next film and turn the rapid
wind lever.)
5 Pull out the film rewind knob
(the back will open automati¬
cally), and remove the film cas¬
sette.

Bright field focusing
1 You can start viewing and focusing
before and after cocking the rapid
wind lever. When the preview lever
is in "AUTO” (automatic) position,
and the meter is at "OFF”, the dia¬
phragm is fully open except for the
moment of exposure.
2 Turn the distance scale ring until
your subject image is clearly in focus.
It is not always necessary for you to
view and focus with the diaphragm
fully open. In bright sunlight, you
can easily focus with diaphragm
closed to f/5.6 or f/8 and still ob¬
serve the depth of field. It is easi¬
er, however, to focus with the dia¬
phragm fully open as your subject
image is much brighter.
When the letters "MAN” appears
beside the lever, the lens is in manual
position; when "AUTO” appears, it
is in automatic position.
Microprism
Honeywell Pentax cameras have a
Fresnel lens with a microprism cen¬
ter underneath the ground glass. As
you look through the finder, you will
see that the Fresnel lens consists of
many concentric rings which provide
the brightest possible image on the
ground glass.
The microprism is the center por¬
tion of this diaphragm. When your
subject is in focus, the image in the
microprism will be sharp and per¬
fectly clear. If your subject is not
in focus, the microprism will break
the image up into many small dots,
much like an engraver’s screen. You
can focus your subject on any por¬
tion of the ground glass.
11

Automatic diaphragm
OUT OF FOCUS
IN FOCUS
When the preview lever is in "AU¬
TO" (automatic) position, and the
exposure meter is turned to "OFF",
the fully automatic diaphragm is at
its largest aperture at all times, ex¬
cept for the instant of exposure, no
matter what aperture is set on the
diaphragm ring. When you release
the shutter, the diaphragm automat
ically stops down to the predeter¬
mined aperture and the shutter cur¬
tains start traveling instantly. When
the exposure is completed, the dia¬
phragm reopens to maximum aper¬
ture completely automatically and
you are ready to compose, focus and
shoot your next pictures. If you wish
to visually check exact depth-of-field
before making the exposure, move the
preview lever to "MAN” (manual)
position. This stops the diaphragm
to the aperture selected and shows
you exactly how much depth-of-field
will appear in your picture. The pre¬
view lever may be moved back to
"AUTO” (automatic) position before
or after making your exposure, or, if
you are making pictures in bright
sunlight, it may be left in manual
position, which permits a constant
check of depth of field.
*When the exposure meter switch is
turned to the "on” position, the lens
diaphragm changes from the auto¬
matic to manual position even though
the preview lever is in the "AUTO”
(automatic) position. When the shut
ter is released, the lens diaphragm
will automatically return to its au¬
tomatic position if the lever is set
on "AUTO”.

Shutter
Turn the shutter speed dial clock¬
wise or counter-clockwise to the
shutter speed desired. The shutter
speed may be sets either before or
after cocking the rapid wind lever.
As you cock the shutter by turning
the rapid wind lever, the "cocked”
indicator turns to red showing that
the shutter is cocked.
The indicator window blacks out
as you trip the shutter button. For
use of ,the X setting on the shutter
speed dial, refer to page 17.
With the shutter speed dial set on
B (bulb), the shutter will stay open
as long as you depress the shutter
button. As you release your finger
from the shutter button, the shutter
closes. When a long exposure is
desired while using the B setting,
attach a shutter release cable with a
locking device to the shutter button.
This will permit a "Time” exposure.
Cautions
—--— iff
At slow speeds—slower than 1/30
— support your camera rigidly or
use a tripKid to prevent movement
of your camera.
2 To protect the shutter mechan¬
ism, trip the shutter release be¬
fore putting the camera out of
use for any extended period.
If you want to know how great the
depth of field is at a certain aper¬
ture, look at the depth-of-field guide.
In the above photograph, the distance
scale is set at 15 feet... the lens is
focused on a subject 15 feet away.
The calibrations on each side of the
distance index correspond to the
diaphragm setting and indicate the
range of in-focus distance for differ¬
ent lens apertures. For example, if
the lens opening of f/8 is to be used.
Depth-of-field guide
the range on the distance scale ring
covered within the figure 8 on the
depth-of-field guide indicates the
area in focus at the lens opening.
You will note from the depth-of-field
guide in the photograph that the
range from approximately 10 to 25
feet is in focus. Note that as the lens
apertures change, the effective depth
of field also changes. For the depth
of fields at different apertures and
distances, refer to page 14.
[ D epth of field is the range between the |
nearest and farthest distances which I
are in focus at different lens apertures. J
13

Depth-of-field table:
^up®r-Multi-Coated Takumar 50mm lens
1'6"
2'
3'
5'
10'
15'
30'
oo
f/1.4
r 6.12'
r 6.13'
BQEl
iSSI
2'11.5'
3' 0.6'
4'I0.4'
5' 1.7'
9' 5.6*
10' 7.2'
13' 9.7'
16' 4.9'
25' 6.6'
36' 4.2'
169' 9.2*
oo
V2
r 5.9'
1' 6.1'
2'll.3'
3' 0.8'
9' 3.1’
10'10.6’
13' 4.3'
17' 1.2'
24' 0.2"
39'11.8'
118' 3.5'
OO
f/2.8
»' 5.8'
1' 6.2'
2'I0.9'
3' I.l'
EB
B'11.9'
11' 3.2'
12' 9.6'
18' 1.4'
22' 3'
46' 1.4'
84'1I.6'
f/4
1' 5.6'
r 6.4'
Bam
8' 7.4'
iri1.2’
12' 0.6'
19'l|’
20' 0.4’
59'11.6'
59' 6.4*
oo
f/5.6
r 5.5'
r 6.5'
rn. 2 '
2' 1'
2'10'
3' 2.3'
8' 1.9'
12'I1.2'
ir 2'
22'10.7'
17' 8.3'
100' 1.3'
*2' 6.8'
OO
f/8
1' 5.4'
r 6.6'
1'I0.8'
2' 1.3'
kmZB
4' 4.1'
5'I0.9*
7' 6.8'
14' 9.5*
10' 1'
29' 7.2'
15' 0.7'
oo
29'10.2*
oo
f/11
r 5.2'
1' 7'
rio.4'
2' 1.9'
m
nsi
6'11.3'
18' 0.6'
8'11.8'
46' 9.7'
12' 8.4'
oo
21' 9*
oo
f/16
r 4.8'
1' 7.3'
m
3'I0'
7' 3'
6' 1.2'
28' 7.6'
7' 7.2*
oo
10 ' r
oo
15'
oo
Depth-of-field table;
_Super-Multi-Coated Takumar 55mm
lens
\Diat«nc«
\
fSetllng\
f/1.8
r 5.9'
r 6.1'
V2
r 5.9'
1' 6.1*
i/2.8
1' 5.9'
1' 6.1'
i/4
r 5.8'
r 6.2'
f/5.6
1' 5.6'
r 6.4'
r i/8
r 5.5'
r 6.5'
vn
r 5.4'
r 6.7'
f/16
r 5.2'
r 7'
rio.3' 2' 7.8'
2' 2' 3' 5.5'
I0'll.5'
8'10.7'
11' 5.3'
8 ' 8 . 1 '
12' 1.7'
8 '
13' 4.4'
15'
30'
oo
13' 9.7'
16' 5'
25' 6.4'
36' 4.7'
168' 2.4"
oo
13' 8.3'
16' 7.1'
25' 1.3'
37' 3.2'
151' 4.8*
oo
13' 2.8'
17' 4'
23' 7*
41' 3.4'
108' 2.3*
oo
12' 7.1'
18' 6.7'
21' 7.2'
49' 2.8'
75' 9.5*
oo
irio.i'
20' 6.2'
19' 5.2'
66’ 3.4'
54' 2.3*
oo
10')0.3'
24' 4.6'
I6'I0.7’
138' 2.8'
37'n.9*
oo
9'I0.1'
3ri0.8'
14' 6.2'
oo
27' 8.2*
oo
ir 9.4*
oo
19' r
oo

Range of light measurement
The exposure irieter of the Spotmatic Ila measures the brightness of the
ground glass. Therefore, the meter should be turned on after you have
focused your subject on the ground glass. The following table shows the
range of the meter’s light measurement, and should not be interpreted as
the camera’s total range of f/stop-shutter speed combinations. As you will
note from the table below, with an ASAIOO film, you may use any shut¬
ter speed from 1 sec. to 1/1000 sec. in combination with any aperture that
will bring the meter needle to the midpoint in the viewfinder. The total
range of the aperture settings is, of course, determined by the minimum
and maximum apertures of the lens being used. For example, with the
50mm f/1.4 lens and ASAIOO film, an aperture from f/1.4 (the maximum
aperture of this lens) to f/16 (the minimum aperture) may be used with
any shutter speed from 1 sec. to 1/1000 sec. that will bring the meter needle
to midpoint.
B
D
n
n B
El
B
Hi
IB
B
HmIi
B B
B B
60
1000
20
• 25
32
B B
• 40
• 50
64
• 80
100
• 125
■ ■ ■
• 160
Bf il
200
B ^ 1
• 250
. 320
iiiiiiii
400
m
• 640
800
HHi
• 1000
IMP
• 1250
_ ■
^ '
1600
• 2000
IMB:
• 2500
HBmmI
B||:
3200
9K
-
11
The arei A indtcites the reeding range of the meter. The area B indicates that aithough the shutter speed index is
blach and the mater needle moaes. the meter is NOT operating properly.
When the meter needle is centered with the shutter speed dial set at B using ASA 20~50 films, this
xnaicaies that the exact shutter speed required is 2 seconds. Please expose your picture for 2 seconds.
15

Mercury battery
DANCER! A serious accident
battery into his mouth and has been
iion. Please
How to insert it
Open the battery housing cover on the
bottom cover plate with a coin. Insert
the battery with ( + ) side toward the
top of the camera. For replacement,
use Mallory PX 400 or RM-400-R or
equivalent.
How to check it
1. Set the shutter speed dial to B
(bulb) position.
2. Turn the ASA dial to ASA 100.
3. Push the meter switch to "on”
position.
Look at the meter's needle through
the viewfinder. If the needle rapidly
drops, the meter battery has sufficient
capacity; if it does not, replace the
mercury battery.
CAUTION: The mercury battery is
like a phonograph record. It can be
damaged by skin acids. Handle by the
edges with a dry cloth only. Be sure
the battery is cleaned with the cloth
before insertion into the camera. The
battery is not rechargeable.
has been reported of a small child who has pul a mercur
h. /. hospitalized for serwus gripes and stomach tnflamma
always keep a mercury battery from the reach of small children.

Flash synchronization
The Spotmatic Ila has FP and X terminals at the front of the camera body,
and a separate X flash contact on the built-in hot shoe. The table below shows
which flash contact, which shutter speed and which flash bulb may be com¬
bined for maximum lamp efficiency. Unless these combinations are rigidly
followed, there will be a failure in flash synchronization. Note the "X”
setting is exactly at the 60 marked on the speed dial. This indicates the
highest shutter speed at which electronic flash units may be used.
The hot shoe X flash contact may be used with hot shoe Strobonars and
Auto/Strobonars or any other electronic flash or flash gun that fits the
built-in hot shoe of the Spotmatic lla.
IV/ien not using these terminals, keep the plugs inserted in the terminals.
SHUTTER
SPEED
FLASH
TERMINAL
1
1000
1
500
1
250
1
125
1
60
X
1
30
1
15
1
T
1
4
1
2
1
CD
FP Class (Screw Base)
FP Class (Bayonet Base)
X
F Class
M Closs & MF Closs
Elettronic Flash
17

Strobo-eye Remote Sensor
The Spotmatic Ha has the
Strobo-Eye remote sensor built
into the camera body. The
sensor measures the light re¬
flected from the subject auto¬
matically and turns the Stro-
bonar off at precisely the right
time for perfect exposures.
The Remote Auto/Strobonar
may be used on or off camera
for dramatic lighting effects
or subtle bounce lighting.
1. To connect the camera and Remote Auto/Strobonar, connect a PC to
standard plug shutter cord to the outlet on the Auto/Strobonar and to
the X-sync terminal on the camera. The Auto/Strobonar can be used
rnounted on the camera or hand held to get perfect exposures automa¬
tically. If a hot shoe Remote Auto/Strobonar is mounted on camera
hot shoe, no shutter cord is required. Set shutter speed dial to X.
2. To set film speed, pull up on the rewind knob (I) when loading the
film and turn the inner dial until the ASA index (Z) is opposite the
ASA number of the film you are using. Any film from ASA 25 (DIN
15) to ASA 400 (DIN 27) may be selected.
3. To select f/stop, turn the outer dial until the ASA index (Z) is oppo¬
site the range indexes (AA) and note the f/stop readings indicated by
the f/stop index (X) at each mark. For each film speed, a total range
of 3 different f/stops are available with automatic flash.
EXAMPLE: With the film speed set at ASA 25 (DIN 15), the ASA index
^t at A, the f/stop selected would be f/2. Correspondingly, if the ASA
index were set to O, the f/stop would be f/2.8, and if set toD, would be f/4.
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