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FM Lens test for Centering (Mount tilt / swing)

  
 
Fred Miranda
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p.8 #1 · p.8 #1 · FM Lens test for Centering (Mount tilt / swing)


Ix4224 wrote:
I just got a new lens and going through this decentering test but I'm having issues with consistency. I'm performing the test right-side up only instead of doing the upside down method as I thought this would be more consistent.

I've run through the lens many times (about a dozen) using a different distant building/sign/pole each time and I'm getting very inconsistent results. Sometimes I'll see that top left corner is a bit softer, sometimes it's the bottom right corner and other times all corners look roughly equal.

I'm making sure to use electronic shutter, IBIS off, manual exposure only and handheld
...Show more

Perform the upside-down method outlined in this thread and analyze the outcomes. I consistently achieve high reliability, indicating that if a lens displays decentering, it does so consistently.



Mar 09, 2024 at 10:31 AM
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