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<blockquote data-quote="blackstar" data-source="post: 752726" data-attributes="member: 47518">Hi everyone, Thanks to DS's reasonable explanation regarding focal length vs magnification, I wonder if I have run (some time) into an issue by using the zoom ring (FL ring) to focus as I have no rail but using a tripod to fix and stabilize shooting position? Once setting a fixed position in a roughly short focal distance to the subject, I then start turning the zoom ring until making a sharp focus on the subject and continue turning ZR if different focusing planes are needed. This operation of macro shooting may cause two issues: 1. Since each shooting occasion is set by a briefly different focal distance to the subject, the outcome will render a briefly different magnification due to different ZR position (focal length), 2. For multi-focus shots, since they are made by changing ZR (focal length) each of them will have different magnification and have issues in focus stacking (this can be resolved if &quot;align&quot; succeeds in the process though). Anyone's thoughts?</blockquote>

[QUOTE="blackstar, post: 752726, member: 47518"] Hi everyone, Thanks to DS's reasonable explanation regarding focal length vs magnification, I wonder if I have run (some time) into an issue by using the zoom ring (FL ring) to focus as I have no rail but using a tripod to fix and stabilize shooting position? Once setting a fixed position in a roughly short focal distance to the subject, I then start turning the zoom ring until making a sharp focus on the subject and continue turning ZR if different focusing planes are needed. This operation of macro shooting may cause two issues: 1. Since each shooting occasion is set by a briefly different focal distance to the subject, the outcome will render a briefly different magnification due to different ZR position (focal length), 2. For multi-focus shots, since they are made by changing ZR (focal length) each of them will have different magnification and have issues in focus stacking (this can be resolved if "align" succeeds in the process though). Anyone's thoughts? [/QUOTE]

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