Could you elaborate on that a bit? How does it increase exposure? Does it require a greater exposure time for the same results as the original screen, or less?
The focus looks pretty good on the pics you posted .... Shel > [Original Message] > From: Don Sanderson > 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!
