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Canon EOS-1D Mark III

Canon · Canon EF · 1.28× crop

The Canon EOS-1D Mark III uses the Canon EF mount with a 1.28× crop factor (about 28.1 × 18.7 mm sensor). Below: equivalent focal lengths, maximum shutter speeds for sharp stars, a hyperfocal distance chart, compatible lenses and how to check the shutter count.

Mount
Canon EF
Crop factor
1.28×
Sensor (approx.)
28.1 × 18.7 mm
Circle of confusion
0.0234 mm

Equivalent focal length & field of view

Lens focal lengthFull-frame equivalentDiagonal FOVHorizontal FOV
8 mm10 mm129.3°120.7°
10 mm13 mm118.7°109.1°
12 mm15 mm109.2°99.0°
14 mm18 mm100.6°90.2°
16 mm21 mm93.1°82.6°
18 mm23 mm86.3°75.9°
20 mm26 mm80.3°70.2°
24 mm31 mm70.2°60.7°
28 mm36 mm62.2°53.3°
35 mm45 mm51.5°43.7°
50 mm64 mm37.3°31.4°
85 mm109 mm22.5°18.8°
135 mm173 mm14.3°11.9°
200 mm256 mm9.6°8.0°
300 mm385 mm6.4°5.4°
400 mm513 mm4.8°4.0°
600 mm769 mm3.2°2.7°

Multiply by the 1.28× crop factor for the full-frame equivalent field of view.

Milky Way exposure: NPF and 500 rule

Focal lengthNPF @ f/1.8NPF @ f/2.8Strict NPF @ f/2.8500 rule
8 mm22.5 s26.9 s14.5 s48.8 s
10 mm18.0 s21.5 s11.6 s39.0 s
12 mm15.0 s17.9 s9.7 s32.5 s
14 mm12.9 s15.4 s8.3 s27.9 s
16 mm11.2 s13.4 s7.3 s24.4 s
18 mm10.0 s11.9 s6.5 s21.7 s
20 mm9.0 s10.8 s5.9 s19.5 s
24 mm7.5 s9.0 s4.9 s16.3 s
28 mm6.4 s7.7 s4.2 s13.9 s
35 mm5.1 s6.1 s3.4 s11.1 s
50 mm3.6 s4.3 s2.4 s7.8 s

NPF = (35 × f-number + 30 × pixel pitch) ÷ focal length, with a pixel pitch of 3.9 µm (typical for this format — exact resolution not in our database). The strict version (Michaud's detailed NPF for the galactic core) gives pin-point stars at 100% view; the 500 rule is a loose rule of thumb that shows trailing on modern sensors.

Hyperfocal distance chart

Focal lengthf/2.8f/5.6f/8f/11f/16
10 mm1.5 m0.8 m0.5 m0.4 m0.3 m
14 mm3.0 m1.5 m1.1 m0.8 m0.5 m
16 mm3.9 m2.0 m1.4 m1.0 m0.7 m
18 mm5.0 m2.5 m1.7 m1.3 m0.9 m
20 mm6.1 m3.1 m2.2 m1.6 m1.1 m
24 mm8.8 m4.4 m3.1 m2.3 m1.6 m
28 mm12 m6.0 m4.2 m3.1 m2.1 m
35 mm19 m9.4 m6.6 m4.8 m3.3 m
50 mm38 m19 m13 m9.8 m6.7 m

Focus at the hyperfocal distance and everything from half that distance to infinity is acceptably sharp (circle of confusion 0.0234 mm). Use the hyperfocal calculator for other settings.

Compatible lenses (280 in our database)

LensFocal lengthMax apertureMount
Canon EF 8-15mm f/4L Fisheye USM8–15 mmf/8Canon EF
Canon EF 11-24mm f/4L USM11–24 mmf/11Canon EF
Canon EF 14mm f/2.8L II USM14 mmf/14Canon EF
Canon EF 15mm f/2.8 Fisheye15 mmf/15Canon EF
Canon EF 16-35mm f/2.8L USM16–35 mmf/16Canon EF
Canon EF 16-35mm f/2.8L II USM16–35 mmf/16Canon EF
Canon EF 16-35mm f/2.8L III USM16–35 mmf/16Canon EF
Canon EF 16-35mm f/4L IS USM16–35 mmf/16Canon EF
Canon EF 17-35mm f/2.8L USM17–35 mmf/17Canon EF
Canon EF 17-40mm f/4L USM17–40 mmf/17Canon EF
Canon EF 20mm f/2.8 USM20 mmf/20Canon EF
Canon EF 20-35mm f/3.5-4.5 USM20–35 mmf/20Canon EF
Canon EF 22-55mm f/4-5.6 USM22–55 mmf/22Canon EF
Canon EF 24-70mm f/2.8L USM24–70 mmf/24Canon EF
Canon EF 24-85mm f/3.5-4.5 USM24–85 mmf/24Canon EF
Canon EF 24-105mm f/4L IS USM24–105 mmf/24Canon EF
Canon EF 24mm f/1.4L USM24 mmf/24Canon EF
Canon EF 24mm f/2.824 mmf/24Canon EF
Canon TS-E 24mm f/3.5L24 mmf/3.5Canon EF
Canon EF 24-70mm f/2.8L II USM24–70 mmf/24Canon EF
Canon EF 24-70mm f/4L IS USM24–70 mmf/24Canon EF
Canon EF 24mm f/2.8 IS USM24 mmf/24Canon EF
Canon EF 24-105mm f/4L IS II USM24–105 mmf/24Canon EF
Canon EF 24mm f/1.4L II USM24 mmf/24Canon EF
Canon EF 24-105mm f/3.5-5.6 IS STM24–105 mmf/24Canon EF
Canon EF 28-70mm f/2.8L USM28–70 mmf/28Canon EF
Canon EF 28-105mm f/3.5-4.5 II USM28–105 mmf/28Canon EF
Canon EF 28-300mm f/3.5-5.6L IS USM28–300 mmf/28Canon EF
Canon EF 28-135mm f/3.5-5.6 IS USM28–135 mmf/28Canon EF
Canon EF 28mm f/1.828 mmf/28Canon EF
Canon EF 28mm f/1.8 USM28 mmf/28Canon EF
Canon EF 28mm f/2.828 mmf/28Canon EF
Canon EF 28-80mm f/3.5-5.6 USM IV28–80 mmf/28Canon EF
Canon EF 28-80mm f/3.5-5.6 USM28–80 mmf/28Canon EF
Canon EF 28-90mm f/4-5.6 USM28–90 mmf/28Canon EF
Canon EF 35mm f/1.4L USM35 mmf/35Canon EF
Canon EF 35mm f/1.4L II USM35 mmf/35Canon EF
Canon EF 35mm f/2 IS USM35 mmf/35Canon EF
Canon EF 35-70mm f/3.5-4.535–70 mmf/35Canon EF
Canon EF 35-80mm f/4-5.6 III35–80 mmf/35Canon EF

Native and adapter-free compatible lenses from the Lensfun database. Third-party and adapted lenses may also work.

How to check the Canon EOS-1D Mark III shutter count

Canon stores the count only for some models (mostly recent mirrorless bodies such as the R-series). Older EOS DSLRs usually need a tethered utility that reads the counter over USB. Try `exiftool -ShutterCount -MechanicalShutterCount image.cr3`.

ExifTool tag: ShutterCount / MechanicalShutterCount. Always test an original, unedited file straight from the card.

Where to buy

Compare new and used prices at these retailers:

B&H PhotoAmazonKEH (used)MPB (used)

Other Canon EF cameras

FAQ

What is the crop factor of the Canon EOS-1D Mark III?
1.28×. A 24 mm lens frames like a 31 mm lens on full frame.
What shutter speed should I use for the Milky Way with the Canon EOS-1D Mark III?
With a 8 mm lens at f/2.8, about 27 seconds keeps stars sharp (NPF rule).
How do I check the shutter count on the Canon EOS-1D Mark III?
Canon stores the count only for some models (mostly recent mirrorless bodies such as the R-series). Older EOS DSLRs usually need a tethered utility that reads the counter over USB. Try `exiftool -ShutterCount -MechanicalShutterCount image.cr3`.
Which lenses fit the Canon EOS-1D Mark III?
Lenses for the Canon EF mount and compatible mounts (Tamron Adaptall) — 280 are listed above.