The Keystone Calculator does its calculations based on a camera with a full frame 35mm sensor measuring 24mm by 36mm. This sensor has an aspect ratio (the ratio of the sensor height to its width) of 2:3. Cameras with full frame sensors include:
- Canon 1D
- Canon 5D
- Canon 6D
- Nikon D4S
- Nikon Df
- Nikon D750
- Nikon D810
- Sony SLT A99
"Half Frame" Cameras
If you are using a camera with a smaller sensor such as in APS-C (or APS-H) sensor then when using the calculator you must enter the 35mm equivalent focal length of your lens, not the true focal length.
Cameras with APS-C sensors include:
- Canon EOS 7D
- Canon EOS 70D
- Canon EOS 60D
- Canon EOS 50D
- Canon EOS 40D
- Canon EOS 30D
- Canon EOS 20D
- Canon EOS 10D
- Canon EOS 700D/Rebel T5i
- Canon EOS 650D/Rebel T4i
- Canon EOS 600D/Rebel T3i
- Canon EOS 550D/Rebel T2i
- Canon EOS 500D/Rebel T1i
- Canon EOS 450D/Rebel XSi
- Canon EOS 400D/Rebel XTi
- Canon EOS 350D/Rebel XT
- Canon EOS 300D/Rebel
- Canon EOS 100D/SL1
- Canon EOS 1100D/Rebel T3
- Canon EOS 1000D/Rebel XS
- Canon EOS D60
- Canon EOS D30
- Nikon D1H
- Nikon D1X
- Nikon D2H
- Nikon D2Hs
- Nikon D2X
- Nikon D2Xs
- Nikon D40
- Nikon D40x
- Nikon D50
- Nikon D60
- Nikon D70
- Nikon D70s
- Nikon D80
- Nikon D90
- Nikon D100
- Nikon D200
- Nikon D300
- Nikon D300S
- Nikon D3000
- Nikon D3100
- Nikon D3200
- Nikon D3300
- Nikon D5000
- Nikon D5100
- Nikon D5200
- Nikon D5300
- Nikon D5500
- Nikon D7000
- Nikon D7100
"Micro Four Thirds" Cameras
Cameras with a Micro Four Thirds sensor have a sensor that is a different shape to full frame and APS-C sensors. Four Thirds sensors have an aspect ratio of 3:4 as compared the 2:3 aspect ratio of full frame and APS-C sensors.
The Keystone Calculator does all its calculations based on an aspect ration of 2:3.
If you are using a camera with a Micro Four Thirds sensor then you must enter the lens focal length as the 35mm equivalent focal length, not the true focal length.
You should also specify a wider Border when preparing your group to allow for the fact that your camera's sensor is a different shape to the full frame sensor used by the calculator.
Cameras with Four Thirds sensors include:
- Olympus E-5
- Olympus E-1
- Olympus E-3
- Olympus E-30
- Olympus E-620
- Olympus E-600
- Olympus E-500
- Olympus E-510
- Olympus E-520
- Olympus E-300
- Olympus E-330
- Olympus E-450
- Olympus E-400
- Olympus E-410
- Olympus E-420
- Panasonic Lumix DMC-L10
- Panasonic Lumix DMC-L1
- Leica Digilux 3