DOF and Cropping take 2

Started 5 months ago | Discussions thread
moving_comfort
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Re: DOF and Cropping take 2
In reply to awaldram, 5 months ago

awaldram wrote:

moving_comfort wrote:

• Using the same lens on a APS-C crop sensor camera and a 35mm full frame body, the APS-C crop sensor camera image has 1.5x LESS depth of field than the 35mm image would have

The answer in NO it doesn't, the image created on the aps-c sensor is identical to the middle 66.6% of the FF sensor.

mod edit: removed personal attack

Read what I and others have said above - you're not cutting out the middle 66% of the image and displaying it at those dimensions, you're cutting it out and magnifying it, which is what changes DOF.

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So lets be clear a 300 F2.8 on FF is exactly the same as a 300 f2.8 on aps-c shutter iso and f-stop will be the same for any given exposure.

300 f/2.8 aps-c vs 300 f/2.8 FF? FOV will be different, DOF will be different, and if you shoot at the same ISO, noise will be different. You're shooting blanks now

Some apropos points to ponder:

• For an equivalent field of view, an APS-C crop sensor camera has at least 1.5x MORE depth of field that a 35mm full frame camera would have - when the focus distance is significantly less then the hyperfocal distance (but the 35mm format needs a lens with 1.5x the focal length to give the same view).

• Using the same lens on a APS-C crop sensor camera and a 35mm full frame body, the APS-C crop sensor camera image has 1.5x LESS depth of field than the 35mm image would have (but they would be different images of course since the field of view would be different)

If you use the same lens on an APS-C crop sensor camera and a 35mm full frame body and crop the full frame 35mm image to give the same view as the APS-C crop image, the depth of field is IDENTICAL

• If you use the same lens on an APS-C crop sensor camera and a 35mm full frame body, then shoot from different distances so that the view is the same, the APS-C crop sensor camera image will have 1.5x MORE DOF then the full frame image.

• Close to the hyperfocal distance, the APS-C crop sensor camera has a much more than 1.5x the DOF of a 35mm full frame camera. The hyperfocal distance of an APS-C crop sensor camera is 1.5x less than that of a 35mm full frame camera when used with a lens giving the same field of view.

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