I refer anyone to http://www.dofmaster.com/dofjs.html and enter these details
5m
400mm
F8 for the 7D and the 5D2.
It seems to contradict what you say.
A cropped camera has a narrower field of view and less depth of field and the circle of confusion is much smaller for a 7D.
For those who cannot be bothered, according to the calculator
the DOF for the 7D is 4cm for those parameters and 7cm for the 5D, a full frame
Perhaps that site has it\'s database for camera and lens specs wrong.
The 7D crop factor gives a telephoto effect, hence a narrower DOF compared to full frame.
Mike Engles
That is only because the framing is different. If you shoot with the same lens from the same distance and with the same aperture and then you crop the 5D Mark II image to the same field of view as the 7D image, the depth of field of the 7D image and the cropped 5D Mark II image will be identical. On the other hand, if you use the same lens with the same aperture and adjust the distance so that framing will be the same, the 5D Mark II image will have shallower depth of field. In no case, on shots taken with the same lens at the same aperture and with the same field of view (whether cropped to the same field of view or with the same field of view because of a distance adjustment), will the 7D image have shallower depth of field.
For example, using the depth of field calculator that you have linked to, if you shoot with your 400/5.6 and a 7D at 100 feet and with an aperture of f5.6, the depth of field is 4.04 feet. If you shoot with the 5D Mark II and with the same 400/5.6 at f5.6 and adjust the distance to 62 feet to get the same framing, the depth of field is reduced to 2.43 feet.
Or, alternatively, if you use a 600 mm lens with the 5D Mark II at f5.6 and a distance of 100 ft to get approximately the same framing as you would get with the 7D and a 400 mm lens at f5.6 and a distance of 100, the 5D Mark II combination has a depth of field of 2.82 feet compared to the 4.04 feet of the 7D combination.
Thus, in a focal length limited situation, if you use the 5D Mark II with a longer lens or by shortening the camera to subject distance (if possible) you reduce the depth of field significantly with the 5D Mark II compared to the 7D. If you use the same lens from the same distance and get the same field of view by cropping the 5D Mark II image to the 7D field of view, the depth of field is identical. Thus, the 5D Mark II image is never going to have larger depth of field.
( I really don\'t know why I\'m bothering to reply.)
I refer anyone to http://www.dofmaster.com/dofjs.html and enter these details
5m
400mm
F8 for the 7D and the 5D2.
It seems to contradict what you say.
A cropped camera has a narrower field of view and less depth of field and the circle of confusion is much smaller for a 7D.
For those who cannot be bothered, according to the calculator
the DOF for the 7D is 4cm for those parameters and 7cm for the 5D, a full frame
Perhaps that site has it\'s database for camera and lens specs wrong.
The 7D crop factor gives a telephoto effect, hence a narrower DOF compared to full frame.
Mike Engles
That is only because the framing is different. If you shoot with the same lens from the same distance and with the same aperture and then you crop the 5D Mark II image to the same field of view as the 7D image, the depth of field of the 7D image and the cropped 5D Mark II image will be identical. On the other hand, if you use the same lens with the same aperture and adjust the distance so that framing will be the same, the 5D Mark II image will have shallower depth of field. In no case, on shots taken with the same lens at the same aperture and with the same field of view (whether cropped to the same field of view or with the same field of view because of a distance adjustment), will the 7D image have shallower depth of field.
For example, using the depth of field calculator that you have linked to, if you shoot with your 400/5.6 and a 7D at 100 feet and with an aperture of f5.6, the depth of field is 4.04 feet. If you shoot with the 5D Mark II and with the same 400/5.6 at f5.6 and adjust the distance to 62 feet to get the same framing, the depth of field is reduced to 2.43 feet.
( I really don\'t know why I\'m bothering to reply.)
I refer anyone to http://www.dofmaster.com/dofjs.html and enter these details
5m
400mm
F8 for the 7D and the 5D2.
It seems to contradict what you say.
A cropped camera has a narrower field of view and less depth of field and the circle of confusion is much smaller for a 7D.
For those who cannot be bothered, according to the calculator
the DOF for the 7D is 4cm for those parameters and 7cm for the 5D, a full frame
Perhaps that site has it\'s database for camera and lens specs wrong.
The 7D crop factor gives a telephoto effect, hence a narrower DOF compared to full frame.
Mike Engles
That is only because the framing is different. If you shoot with the same lens from the same distance and with the same aperture and then you crop the 5D Mark II image to the same field of view as the 7D image, the depth of field of the 7D image and the cropped 5D Mark II image will be identical. On the other hand, if you use the same lens with the same aperture and adjust the distance so that framing will be the same, the 5D Mark II image will have shallower depth of field. In no case, on shots taken with the same lens at the same aperture and with the same field of view (whether cropped to the same field of view or with the same field of view because of a distance adjustment), will the 7D image have shallower depth of field.
( I really don\'t know why I\'m bothering to reply.)
Les
Sep 04, 2012 at 11:58 AM
Previous versions of uz2work's message #10933930 « How noisy is your 7D? »
