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07-12-2019, 02:24 AM   #1
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In live view mode with a tripod with a series of frames, they are of different sizes

Help! When shooting with a tripod (column) in live view mode on the pentax 645z and a 120mm 1: 4 macro lens with a series of shots, the object turns out to be a dimly sized one!
I shot without live view with a raised mirror. Just in live view mode with a tripod. I have a very massive tripod column, which in theory should exclude any vibration. However, in the end, if I want to shoot several frames with sharpness in different places (to make stacking later), then the objects in the frame are of different sizes (the object does not move and the camera too). Please help with solving this problem!

07-12-2019, 02:32 AM   #2
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Welcome to the forums, Yuri

Could you post two or three captured frames to illustrate what you're describing? It would be very helpful for us in getting to the bottom of your problem.

The behaviour you describe sounds to me like "focus breathing", where the angle of view changes with the focus distance. But I confess I'd be surprised if it was noticeable between multiple shots focused at only slightly different distances for the purposes of stacking...
07-12-2019, 02:45 AM   #3
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Here is an example of what I'm talking about. Focus on different frames for subsequent stacking. It happens that I take pictures on the 3D table (and do not change the focus point, the object simply rotates around the axis) and stacks with the same problem.
07-12-2019, 02:47 AM   #4
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Here are the photos

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07-12-2019, 03:43 AM - 1 Like   #5
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You need a rail to move the camera back. 1:1 is at the minimum focus distance. Since the lens extends to reach 1:1 as you change focus you are extending your distance and no longer at 1:1.
A work around is to frame at the farthest focus point at 1:1 with what you want in frame. Then as you focus on other parts it gets bigger so you can crop on those frames. Distortion can sometimes be a problem, less if you don't start at 1:1 but maybe 1:1.2

Edit by bigger I meant more stuff in frame. In stack it can resize and that extra can be cropped.

Edit more on focus rail and macro.

Last edited by swanlefitte; 07-12-2019 at 03:59 AM.
07-12-2019, 03:57 AM   #6

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The stacking software should deal with slight change of subject size/perspective when moving the focus.
07-12-2019, 04:06 AM   #7
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Thanks a lot! I'll try to do this


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