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D700 Backfocus on manual focus

timberline12k

Kansas City, US
490 posts

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timberline12k Registered since 10th Sep 2008
Tue 24-Nov-09 01:46 AM | edited Tue 24-Nov-09 01:52 AM by timberline12k

I did not feel comfortable changing out my focus screen so I mailed my D700 to Katz Eye to swap out the focus screen. They ran a calibration test that showed a significant back focus condition on manual focus. They adjusted the shim thickness from 0.15mm to 0.25mm and set the manual focus calibration screw. They cleaned and retested to confirm the adjustment was accurate. Turn around was one week and they had good communication.

I have read about back focus, but don't really understand what it is and how if affects photographs.

Does anyone want to take a stab at a simple explanation and is this common with D700's?

David
D700 | 21/2.8 ZF.2 | 50/2 ZF.2 | 85/1.4 G | 100/2 ZF.2 | 200/2 G | 24-120/4 G

G