I have run across aftermarket manual focusing screens for the D7000 on eBay. They are from Chinese vendors, come cheap ($20), and appear to be copies, functionally, of the 'P' type screens (microprism collar around RF split-image set at 45 degrees) made for the F3, F4, and other film SLRs. The listings carry instructions, which appear simple and safe, but I wonder? Anyone have any experience using these in the D7000 , or other cameras (the screens are made for a lot of cameras). Basically, are these safe to use, do they work well (interfere with AF?), and can the original screen be put back securely later on? I have a growing number of manual focus Nikkors, and I pine for the ease of focus on fully mech bodies. Thanks.
#1. "RE: D7000 aftermarket focusing screens?" In response to Reply # 0 Mon 29-Apr-13 12:53 PM by gfinlayson
I have used one bought from http://www.focusingscreen.com/. It's made from a genuine Nikon type K3 screen and has the split prism and micro-prism. It's more expensive than the $20 variants though, but every bit as good as the katzeye I had for my D700.
All of the installation tools were supplied, plus a few shims for fine-tuning the focus. It works well, and doesn't interfere with AF at all. The only issue to be aware of with these types of screens is that they will overexpose in spot metering mode because of the prisms.
With fast lenses, the difference is minimal, but on slower lenses, the difference can be as much as one and a half stops.