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04-12-2014, 12:13 PM   #1
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testing front and back focusing

I have a sigma 135-400. I have a pentax k30 and k5. do you know the setting on lens calibration for this lens. is there a easy way to fix the front and back focus?

04-12-2014, 12:55 PM   #2
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Here's our article on FF/BF:
Fixing Front and Back Focus - Introduction -

Since you have a zoom you will have to test it at various focal lengths to see if the problem is consistent.

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