Some of you will remember I bought this on eekBay 10 or so days ago: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7573618765
Here are the focus accuracy results using the microprism center: http://www.donsauction.com/pdml/istD_FocusScreen.htm This is with a Sigma 50/2.8 macro wide open, focus point was the highlight in the top birdies eyeball, manual focus. Seems absolutely spot on to me, though the screen seems a bit less bright than the original, focusing was very easy, the microprism effect was quite pronounced. Autofocus seems to not be affected in any way. The new screen seems to increase exposure by about 1/2 stop. All in all, a good $30.00 spent for a focus challenged person such as myself. ;-) One Caution: The new screen is a bit thicker so it loads the springs on the closed retainer frame a bit more. When you release it, be ready to catch it as it pops out! Don
