Hi folks, I have a question about AF through the viewfinder. I notice my D600 back-focuses regardless of lens use (G, D, Ai, Third-Party), but looking through the viewfinder, I can see it focusing exactly where I've place the focus spot (I use single spot). Looking at it through live view or after taking a shot, the image is back-focused.
I deduct from this therefore that AF through the finder is dependent on how the focus screen is spaced. For those of you who are aware, you know that there are tiny spacer shims behind the focusing screen that position it relative to the pentaprism (or pentamirror, depending on your camera).
So my question is, which way would the screen have to go to correct for this? Although I don't mind taking the screen off and removing a shim if that will do it, I would do it only if I know the screen would need to be closer to the pantaprism in order to reach correct AF. I don't want to bother messing with it otherwise.
So does anyone know if I would have to remove or add a spacer shim to compensate for back-focus? Obviously if I have to add one I have to bring it to a shop, but if it's simple enough for me to remove one, I'll do that. I believe that there are different thickness spacers used, I would simply start with the thinnest one first.
Thanks for any info on this.