Focus Breathing in lens when using focus stacking
Jan 11, 2018 13:31:03 #
BebuLamar wrote:
Hi Gene!
I often use the bellow for close up and using bellow is when focus stacking is most needed. With the bellow I can change the plane of focus in 3 ways or combination of the 3. Moving the lens, moving the body, moving the body and lens away or toward the subject. So according to your post the best way is to move both camera and lens by the same amount? Of course using the bellow doesn't have the problem of focus breathing but still it is still best to move both?
I often use the bellow for close up and using bellow is when focus stacking is most needed. With the bellow I can change the plane of focus in 3 ways or combination of the 3. Moving the lens, moving the body, moving the body and lens away or toward the subject. So according to your post the best way is to move both camera and lens by the same amount? Of course using the bellow doesn't have the problem of focus breathing but still it is still best to move both?
Yes. Once you set up your camera for optimum image quality, which is usually around F8-F11 depending on the lens, then you pick an increment that is within your DoF criteria for sharpness. I use a chart, but I cut the DoF in half - in other words, if I am using a Tamron 180 F3.5 Macro, and I am at a distance of 20" from leading edge of subject to sensor plane on a full frame camera, the DoF is .14 inches at F11. I will use a much tighter .07 inch as my increment for moving the lens and camera. The reason you move both the lens and the camera, even if you are using a bellows, is that racking just the bellows causes small changes in light getting to the sensor. Moving both eliminates that variable.
Jan 12, 2018 00:33:28 #
Some FS software like Helicon seem to be “aware” of the issue and try to compensate for it.
I can see breathing if I watch for it
on many of my lenses. I’m guessing the others do it too but it’s just not obvious. Per what I read somewhere/when in the past is that the only lenses that don’t breath are cinema lenses and they cost like the devil!
I can see breathing if I watch for it
on many of my lenses. I’m guessing the others do it too but it’s just not obvious. Per what I read somewhere/when in the past is that the only lenses that don’t breath are cinema lenses and they cost like the devil!
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