I have been very lucky buying this SLR old-school focusing screen for only 17 euro, it is like new, 0 scratch, just had de resize it to the K200D FS size, it is maybe 1/100 mm thiner than the genuine screen so I inserted a very thin adhesive on screen borders. The demi-disks are now perfectly calibrated, tested on macro shots wide open, perfect focus ! I'm pretty shure it's better quality than Catzeyes products, brighter than the genuine one, and the mate surface is awesome
I should not anymore miss any MF shoot (in fact I only MF shoot).
My new focusing screen by
Bruno Polleri, sur Flickr
As I have no AF lens, can't say if it would have an impact on AF, but probably not, I'll see if I need an AF lens one day
This one has the 2 demi-disks and the micro-prisms ring around, only missing horizontal and vertical lines, but I now know how to make them using a hard china ink drawing pen, a razor blade can do the job with very gentle pressure and you get your rulers...