----- Original Message ----- From: "Roman Melihhov" Subject: katz eye focusing screen and slow apertures
> How catz eye focusing screen works with apertures slower than 4 - 5.6? > From my earlier experience with non-pentax bodies and AF-screen with > microprisms it's not so good on apertures 5.6 and slower. In fact - it > may be useless or disturbing and given that some good DA series lenses I > own are f/4.0 or f4.0-6.3, I'd rather hear your practical opinion before > I decide to change my installed K20D AF-screen for katz eye. > I just tried the A400/5.6. The microprism is fine, the split image is fine, but make sure your eye is well centered on the viewfinder or else there is blackout on the split image. With the A400/5.6 and the 1.4X converter mounted, the microprism is fine, the split image is suffering partial blackout, but is still usable. With the A400/5.6 and the 2x converter, the microprism is fine, the split image is suffering partial blackout, but is still usable. In all cases, it is easier to focus the K20 with the Katz Eye than the K10 with the stock screen, though not by a huge margin. As I mentioned the other day, the K20 AF seems to be more accurate than what I can acheive with manual focus, which I expect says more about my eyesight than anything elses. I did get the optibrite treatment for the Katz Eye. Were I only using AF lenses, I wouldn't bother with a replacement screen, but I use a mix of manual focus and auto focu lenses, and i think I will find the Katz Eye helps my manual focusing, especially with the longer focal lengths such as the 400 and 600mm. William Robb -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
