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D7000 Backfocus: am I missing something?

RLDubbya

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

RLDubbya Silver Member Nikonian since 24th Dec 2011
Thu 10-Jan-13 10:24 PM

>>Not trying to be argumentative - just want to be clear on
>the
>>facts.
>
>Well in that case, I assumed your OP was supposed to be the
>18-55 for I only know of one 17-55 and that is the f/2.8
>Nikkor which I would hardly call cheap or define as a kit
>lens.
>
Sorry, I sometimes type (and speak) wrong numbers. Like when I told my wife on her 40th birthday that I was going to trade her in for a pair of 20 year olds. Definitely misspoke there.

The 18-55 is indeed a cheap kit lens. Sorry for the confusion.


>But still, the 18-55 that's listed in your profile slower
>variable aperture and seems to be working fine at wide angle,
>and the newer faster lenses would by design have a narrower
>DOF when shooting wide open aren't; perhaps there is a slight
>variation there. But again I know you are diligent in your
>testing and I'm sure you took that into account.
>

Yes, not even close. I have a nice contrasty target, and even using AF-S with a Speedlight assist, getting focus locked, and then checking in Capture NX to make sure that focus was at that point - not even close. Shot about 50 "real world" shots, both with flash and without, and not one even close to being in focus. I even thought about the DOF, and did some shooting at f11, and focus was the same abysmal miss.

At this stage of the ballgame, I pretty much always assume operator error is the issue, mainly because I know the operator.

I just started testing, shot 3 shots with af-tune -20, 0, +20. -20 is clearly approaching (if not in) focus.

That's as far as I've taken it. I'm sure I could do some real world shooting and get at least acceptable results at -20, but I want to test some more.


>But again I don't feel this has anything to do with DX versus
>FX designs, and is more due to calibration tolerances and luck
>of the draw.
>
>Pete
>

Fair enough; I tend to agree, and I do appreciate your thoughts on this.

Thanks,

Bob

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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