That's the site. I've installed three separate focusing screens so far in three different Nikon bodies. I opted for the super precision matte canon S screen (i.e. optimized for fast lenses below f2.8) each time as I don't like to be restricted to focusing in the centre only.
None of the original nikon metal shims worked with the new focusing screen but they do supply plastic ones of variable thickness which allow you to fine tune the distance perfectly. I had to order a slightly slimmer shim once as well and they sent a few at no charge. I had to insert two shims each time. Yes, it is a bit fiddly (they do provide all the tools) and you have to be careful no to scratch the focusing screen during installation but the results are far better than the standard screen for manual focusing. I have not tried other types but the s type is fantastic as you are able to see actual depth of field at wide open.
I think it is worth it and it does not seem to affect AF operation or metering either.
None of the original nikon metal shims worked with the new focusing screen but they do supply plastic ones of variable thickness which allow you to fine tune the distance perfectly. I had to order a slightly slimmer shim once as well and they sent a few at no charge. I had to insert two shims each time. Yes, it is a bit fiddly (they do provide all the tools) and you have to be careful no to scratch the focusing screen during installation but the results are far better than the standard screen for manual focusing. I have not tried other types but the s type is fantastic as you are able to see actual depth of field at wide open.
I think it is worth it and it does not seem to affect AF operation or metering either.
infocusing screen.com ........suggest you google replacement screens for Nikon Df ....plenty of information including how to videos . Not easy and calibration requires luck or skill .