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D7000 Backfocus: am I missing something?

doppler_fto

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"RE: D7000 Backfocus: am I missing something?"

doppler_fto Registered since 23rd Mar 2013
Fri 10-May-13 03:54 AM

Note that if the mirror stops aren't tuned correctly, that could cause this to happen. The center of the mirror is half-silvered in the center, and the half-silvered section has a _secondary_ mirror which reflects light down to be split between the metering sensor and the AF sensor. If that mirror is positioned incorrectly, it could change the length of the light path for the AF sensor and cause AF inaccuracies.

Unfortunately, the AF fine tune adjustments don't have any units, so it's unclear how much the mirror would have to be off to require a correction of -20.

Not having used a D7000, I have no idea how likely or unlikely this is; just a theory.

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This is a hot, active topic! D7000 Backfocus: am I missing something? [View all] , RLDubbya Silver Member , Wed 09-Jan-13 10:29 AM
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