Continuation of my Nikon D4 assymetrical AF saga Part III

Started Jun 16, 2013 | Discussions thread
chlamchowder Senior Member • Posts: 2,083
Re: My interpretation

I did bring sample images in once but leonard-talk started and the rep would tell me about the standard procedures and line chart that Nikon uses to test AF. I feel that they are not doing anything (yet) because they don't want things to be blown out of proportions... furthermore some senior techs at sendai factory will get the beating for sure.

If I were in your position, I wouldn't even bother bringing sample images. They didn't see them being taken, so they can say all sorts of things about clumsy technique, improper AF fine tune calibration, or so on. Well, I might bring one or two real world images showing how badly the problem affects results.

What I would do is to actually take the camera itself into the conversation. As soon as that talk about whether the problem actually exists starts, I'd take the camera out of the bag, mount a lens on it, and give him a demonstration.

I'd focus on a subject using the leftmost point in AF-S mode several times, and show him (via image review) that each time, the subject comes out OOF even though the camera clearly confirmed focus and the right AF point was clearly selected (visible in image review as a red box over the subject). Then, I'd focus/recompose using the center point, or use live view CDAF, and show him just how much of a difference that left point focus inaccuracy makes. And finally, I'd take some pictures using the center focus point to show that I've already done AF fine tune, and explain that adjusting AF fine tune to the left point would throw off my center point, and so on.

It's easy to deny that equipment is at fault when only sample images are in question. After all, there are a ton of factors in any scenario that could cause focus inaccuracy. But I think it'll be pretty convincing if you demonstrate the problem right there.

 chlamchowder's gear list:chlamchowder's gear list
Sony Alpha DSLR-A580 Nikon D600 Sony DT 18-55mm F3.5-5.6 SAM +8 more
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