Film SLR · 1982

Canon AL-1

The Canon AL-1 is a film slr from 1982 that exposes a 48 × 42 mm frame on 135 film. Its crop factor is 0.68× — 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 mm0.68× cropCanon FD
Canon AL-1 camera
Photo: Riverguardian, CC BY-SA 4.0, via Wikimedia Commons
0.68×
Crop factor
47.6×42.1 mm
Image area
2004 mm²
Area · 232% of full frame
1982
Release year

Specifications#

Brand
Canon
Model
AL-1
Camera type
Film SLR
Released
1982-03-01
Lens mount
Canon FD
Film format
135 film
Image area
47.6 × 42.1 mm (Medium format 53.4 × 40 mm)
Crop factor
0.68×
ISO range
25 – 1,600
Weight
490 g (17.3 oz)
Focus
Manual
Metering
EV3.5 to EV18
Flash
Hot shoe
Dimensions
86.5 × 142.1 × 47.6 mm
Made in
Japan

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

Sensor size compared#

Canon AL-1Medium format 44 × 33 mmFull frame (35 mm)APS-CFour Thirds / Micro Four Thirds
The Canon AL-1 frame (highlighted) drawn to scale against common formats. Its area is 232% of a full-frame sensor.

Focal length equivalents & field of view#

Multiply any focal length by 0.68 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 mm97.2°90.1°113.1°
23 mm16 mm92.0°84.9°108.2°
28 mm19 mm80.7°73.9°97.2°
32 mm22 mm73.3°66.7°89.6°
35 mm24 mm68.4°62.0°84.5°
45 mm31 mm55.7°50.1°70.4°
55 mm37 mm46.8°41.9°60.0°
63 mm43 mm41.4°37.0°53.5°
80 mm54 mm33.1°29.5°43.3°
90 mm61 mm29.6°26.3°38.9°
110 mm75 mm24.4°21.7°32.2°
120 mm82 mm22.4°19.9°29.7°
150 mm102 mm18.0°16.0°23.9°
180 mm123 mm15.1°13.3°20.0°
250 mm170 mm10.9°9.6°14.5°
350 mm238 mm7.8°6.9°10.4°

Depth of field table#

Total depth of field at each subject distance, using a circle of confusion of 44.1 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 cm15.1 cm62.4 cm1.46 m4.52 m38.2 m12.9 m
32 mmf/2.85.7 cm23.6 cm1.00 m2.46 m9.33 m∞8.33 m
32 mmf/48.1 cm34.3 cm1.53 m4.15 m31.8 m∞5.84 m
32 mmf/816.5 cm75.0 cm5.01 m∞∞∞2.94 m
64 mmf/1.80.8 cm3.6 cm15.0 cm34.2 cm96.5 cm4.00 m51.7 m
64 mmf/2.81.3 cm5.6 cm23.4 cm53.5 cm1.52 m6.57 m33.3 m
64 mmf/41.9 cm8.1 cm33.6 cm77.0 cm2.22 m10.5 m23.3 m
64 mmf/83.8 cm16.2 cm68.5 cm1.62 m5.18 m63.6 m11.7 m
109 mmf/1.80.3 cm1.2 cm5.1 cm11.6 cm32.7 cm1.33 m150 m
109 mmf/2.80.4 cm1.9 cm7.9 cm18.0 cm50.9 cm2.08 m96.4 m
109 mmf/40.6 cm2.6 cm11.2 cm25.8 cm72.9 cm3.00 m67.5 m
109 mmf/81.2 cm5.3 cm22.5 cm51.8 cm1.48 m6.42 m33.8 m
179 mmf/1.80.1 cm0.4 cm1.8 cm4.2 cm11.9 cm48.6 cm404 m
179 mmf/2.80.1 cm0.6 cm2.8 cm6.5 cm18.6 cm75.7 cm260 m
179 mmf/40.2 cm0.9 cm4.0 cm9.3 cm26.5 cm1.08 m182 m
179 mmf/80.4 cm1.8 cm8.0 cm18.6 cm53.2 cm2.19 m91.1 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 64 mm
f/1.2f/0.877.5 m
f/1.4f/1.066.5 m
f/1.8f/1.251.7 m
f/2f/1.446.5 m
f/2.8f/1.933.3 m
f/4f/2.723.3 m
f/5.6f/3.816.7 m
f/8f/5.411.7 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
21 mm (14 mm eq.)35.0 s
29 mm (20 mm eq.)25.3 s
35 mm (24 mm eq.)21.0 s
51 mm (35 mm eq.)14.4 s
73 mm (50 mm eq.)10.1 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
147 mm1/100 s1/13 s0.3 s
294 mm1/200 s1/25 s1/6 s

Frequently asked questions#

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

The Canon AL-1 has a crop factor of 0.68× relative to 35 mm full frame (diagonal 63.5 mm vs 43.3 mm).

What size is the Canon AL-1 frame?

47.6 × 42.1 mm (Medium format 53.4 × 40 mm), an area of 2004 mm² — 232% of full frame.

What lens mount does the Canon AL-1 use?

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

How long can I expose the night sky with the Canon AL-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

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