Film SLR

Canon T70

The Canon T70 is a film slr that exposes a 51 × 48 mm frame on 135 film. Its crop factor is 0.62× — wider than full frame, so a 50 mm lens frames like 31 mm. Every number below is calculated for this exact film format.

Medium format 53.4 × 40 mm0.62× crop
Canon T70 camera
Photo: Ashley Pomeroy, CC BY-SA 4.0, via Wikimedia Commons
0.62×
Crop factor
51.0×48.0 mm
Image area
2448 mm²
Area · 283% of full frame

Specifications#

Brand
Canon
Model
T70
Camera type
Film SLR
Film format
135 film
Image area
51.0 × 48.0 mm (Medium format 53.4 × 40 mm)
Crop factor
0.62×
Weight
580 g (20.5 oz)
Focus
Manual
Exposure modes
Manual, Shutter Priority and Program autoexposure
Flash
Hot shoe
Dimensions
89 x 151 x 48 mm
Made in
Japan
Launch price
69,000 1984, body only

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

Sensor size compared#

Canon T70Medium format 44 × 33 mmFull frame (35 mm)APS-C
The Canon T70 frame (highlighted) drawn to scale against common formats. Its area is 283% of a full-frame sensor.

Focal length equivalents & field of view#

Multiply any focal length by 0.62 to get the full-frame field of view. For fixed-lens cameras use the real focal length printed on the lens (e.g. “6.1–18.3 mm”), not the 35 mm equivalent.

Lens on this cameraFull-frame equivalentHorizontalVerticalDiagonal
21 mm13 mm101.1°97.6°118.1°
23 mm14 mm95.9°92.4°113.4°
28 mm17 mm84.6°81.2°102.7°
32 mm20 mm77.1°73.7°95.2°
35 mm22 mm72.2°68.9°90.0°
45 mm28 mm59.1°56.1°75.8°
55 mm34 mm49.7°47.1°65.0°
63 mm39 mm44.1°41.7°58.1°
80 mm49 mm35.4°33.4°47.3°
90 mm56 mm31.6°29.9°42.5°
110 mm68 mm26.1°24.6°35.3°
120 mm74 mm24.0°22.6°32.5°
150 mm93 mm19.3°18.2°26.3°
180 mm111 mm16.1°15.2°22.0°
250 mm154 mm11.6°11.0°15.9°
350 mm216 mm8.3°7.8°11.4°

Depth of field table#

Total depth of field at each subject distance, using a circle of confusion of 48.6 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
35 mmf/1.83.3 cm13.8 cm57.2 cm1.33 m4.05 m28.8 m14.0 m
35 mmf/2.85.2 cm21.7 cm91.6 cm2.21 m7.91 m∞9.04 m
35 mmf/47.4 cm31.3 cm1.38 m3.62 m20.7 m∞6.34 m
35 mmf/815.1 cm67.5 cm4.08 m48.7 m∞∞3.19 m
70 mmf/1.80.8 cm3.3 cm13.8 cm31.4 cm88.6 cm3.66 m56.1 m
70 mmf/2.81.2 cm5.2 cm21.5 cm49.1 cm1.39 m5.96 m36.1 m
70 mmf/41.7 cm7.4 cm30.8 cm70.6 cm2.03 m9.32 m25.3 m
70 mmf/83.4 cm14.8 cm62.7 cm1.47 m4.61 m41.4 m12.7 m
119 mmf/1.80.2 cm1.1 cm4.6 cm10.7 cm30.2 cm1.22 m162 m
119 mmf/2.80.4 cm1.7 cm7.2 cm16.6 cm47.0 cm1.91 m104 m
119 mmf/40.5 cm2.4 cm10.3 cm23.7 cm67.3 cm2.76 m73.0 m
119 mmf/81.0 cm4.8 cm20.7 cm47.7 cm1.36 m5.85 m36.6 m
196 mmf/1.80.1 cm0.4 cm1.6 cm3.8 cm10.9 cm44.6 cm440 m
196 mmf/2.80.1 cm0.6 cm2.6 cm6.0 cm17.0 cm69.5 cm283 m
196 mmf/40.2 cm0.8 cm3.6 cm8.5 cm24.3 cm99.4 cm198 m
196 mmf/80.3 cm1.6 cm7.3 cm17.0 cm48.7 cm2.00 m99.1 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 70 mm
f/1.2f/0.784.2 m
f/1.4f/0.972.1 m
f/1.8f/1.156.1 m
f/2f/1.250.5 m
f/2.8f/1.736.1 m
f/4f/2.525.3 m
f/5.6f/3.518.1 m
f/8f/4.912.7 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
23 mm (14 mm eq.)35.2 s
32 mm (20 mm eq.)25.3 s
39 mm (24 mm eq.)20.8 s
57 mm (35 mm eq.)14.2 s
81 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
39 mm1/25 s0.3 s1.3 s
81 mm1/50 s1/6 s0.6 s
162 mm1/100 s1/13 s0.3 s
324 mm1/200 s1/25 s1/6 s

Frequently asked questions#

What is the crop factor of the Canon T70?

The Canon T70 has a crop factor of 0.62× relative to 35 mm full frame (diagonal 70.0 mm vs 43.3 mm).

What size is the Canon T70 frame?

51.0 × 48.0 mm (Medium format 53.4 × 40 mm), an area of 2448 mm² — 283% of full frame.

How long can I expose the night sky with the Canon T70?

With a 32 mm lens (20 mm equivalent) the 500 rule gives 25 s.

Sources & licences#

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