Film SLR · 1978

Canon A-1

The Canon A-1 is a film slr from 1978 that exposes a 48 × 41 mm frame on 35 mm film (135). Its crop factor is 0.69× — wider than full frame, so a 50 mm lens frames like 34 mm. Every number below is calculated for this exact film format.

Medium format 53.4 × 40 mm0.69× cropCanon FD
Canon A-1 camera
Photo: Martintoy, CC BY 3.0, via Wikimedia Commons
0.69×
Crop factor
48.0×41.0 mm
Image area
1968 mm²
Area · 228% of full frame
1978
Release year

Specifications#

Brand
Canon
Model
A-1
Camera type
Film SLR
Released
1978
Lens mount
Canon FD
Film format
35 mm film (135)
Image area
48.0 × 41.0 mm (Medium format 53.4 × 40 mm)
Crop factor
0.69×
Weight
620 g (21.9 oz)
Focus
Manual
Metering
Center-weighted average metering
Dimensions
92 x 141 x 48 mm
Production
1978-1985

Specifications merged from Wikipedia and Wikidata. Spot an error? Tell us.

Sensor size compared#

Canon A-1Medium format 44 × 33 mmFull frame (35 mm)APS-CFour Thirds / Micro Four Thirds
The Canon A-1 frame (highlighted) drawn to scale against common formats. Its area is 228% of a full-frame sensor.

Focal length equivalents & field of view#

Multiply any focal length by 0.69 to get the full-frame field of view. Angles are for a rectilinear lens focused at infinity.

Lens on this cameraFull-frame equivalentHorizontalVerticalDiagonal
21 mm14 mm97.6°88.6°112.7°
23 mm16 mm92.4°83.4°107.8°
28 mm19 mm81.2°72.4°96.8°
32 mm22 mm73.7°65.3°89.2°
35 mm24 mm68.9°60.7°84.1°
45 mm31 mm56.1°49.0°70.1°
55 mm38 mm47.1°40.9°59.7°
63 mm43 mm41.7°36.0°53.2°
80 mm55 mm33.4°28.7°43.1°
90 mm62 mm29.9°25.7°38.7°
110 mm75 mm24.6°21.1°32.0°
120 mm82 mm22.6°19.4°29.5°
150 mm103 mm18.2°15.6°23.8°
180 mm123 mm15.2°13.0°19.9°
250 mm171 mm11.0°9.4°14.4°
350 mm240 mm7.8°6.7°10.3°

Depth of field table#

Total depth of field at each subject distance, using a circle of confusion of 43.8 µm (the 0.030 mm full-frame standard scaled by the crop factor).

FocalAperture50.0 cm1.00 m2.00 m3.00 m5.00 m10.0 mHyperfocal
32 mmf/1.83.6 cm15.0 cm62.0 cm1.45 m4.48 m37.2 m13.0 m
32 mmf/2.85.6 cm23.5 cm99.8 cm2.44 m9.20 m∞8.39 m
32 mmf/48.1 cm34.0 cm1.52 m4.10 m30.5 m∞5.88 m
32 mmf/816.4 cm74.3 cm4.92 m∞∞∞2.96 m
63 mmf/1.80.9 cm3.7 cm15.4 cm35.1 cm99.0 cm4.10 m50.4 m
63 mmf/2.81.3 cm5.8 cm24.0 cm54.9 cm1.56 m6.77 m32.4 m
63 mmf/41.9 cm8.3 cm34.4 cm79.1 cm2.29 m10.9 m22.7 m
63 mmf/83.9 cm16.6 cm70.4 cm1.67 m5.38 m75.8 m11.4 m
107 mmf/1.80.3 cm1.2 cm5.2 cm11.9 cm33.7 cm1.37 m145 m
107 mmf/2.80.4 cm1.9 cm8.1 cm18.6 cm52.5 cm2.14 m93.5 m
107 mmf/40.6 cm2.7 cm11.6 cm26.6 cm75.2 cm3.10 m65.5 m
107 mmf/81.2 cm5.5 cm23.2 cm53.5 cm1.53 m6.66 m32.8 m
176 mmf/1.80.1 cm0.4 cm1.9 cm4.3 cm12.3 cm50.0 cm393 m
176 mmf/2.80.1 cm0.7 cm2.9 cm6.7 cm19.1 cm77.9 cm253 m
176 mmf/40.2 cm0.9 cm4.1 cm9.6 cm27.3 cm1.11 m177 m
176 mmf/80.4 cm1.9 cm8.3 cm19.2 cm54.7 cm2.25 m88.6 m

Equivalent aperture#

Exposure is identical at the same f-number on any format; equivalence only describes depth of field and total light.

Aperture on this cameraFull-frame equivalent (depth of field)Hyperfocal at 63 mm
f/1.2f/0.875.6 m
f/1.4f/1.064.8 m
f/1.8f/1.250.4 m
f/2f/1.445.4 m
f/2.8f/1.932.4 m
f/4f/2.722.7 m
f/5.6f/3.816.3 m
f/8f/5.511.4 m

Night-sky exposure limits#

Longest exposure before stars trail. The NPF rule accounts for pixel pitch and is stricter than the classic 500 rule — use it for pin-sharp stars on high-resolution sensors. (NPF needs a known resolution and is omitted here.)

Focal length500 rule
20 mm (14 mm eq.)36.5 s
29 mm (20 mm eq.)25.2 s
35 mm (24 mm eq.)20.8 s
51 mm (35 mm eq.)14.3 s
73 mm (50 mm eq.)10.0 s

Open the NPF / 500 rule calculator →

Handheld shutter speed guide#

The reciprocal rule uses the equivalent focal length. High-resolution sensors may need one stop faster than this for pixel-sharp results.

Focal lengthNo stabilisation (1/equiv. focal)With 3-stop ISWith 5-stop IBIS
35 mm1/25 s0.3 s1.3 s
73 mm1/50 s1/6 s0.6 s
146 mm1/100 s1/13 s0.3 s
292 mm1/200 s1/25 s1/6 s

Frequently asked questions#

What is the crop factor of the Canon A-1?

The Canon A-1 has a crop factor of 0.69× relative to 35 mm full frame (diagonal 63.1 mm vs 43.3 mm).

What size is the Canon A-1 frame?

48.0 × 41.0 mm (Medium format 53.4 × 40 mm), an area of 1968 mm² — 228% of full frame.

What lens mount does the Canon A-1 use?

The Canon A-1 uses the Canon FD (flange distance 42.00 mm).

How long can I expose the night sky with the Canon A-1?

With a 29 mm lens (20 mm equivalent) the 500 rule gives 25 s.

Sources & licences#

Last updated October 03, 2026 · How we calculate · Sources