Well, I finally got around to installing the Katz-Eye focus screen in my 20D today. It all went quite smoothly according to the excellent directions on thier web site. Took about 10 minutes from start to finish and all you really need for tools is a wooden tooth pick and a tweezers. First impression is I like it. Much easier to critically focus using either the split screen or the micro prism collar. I Just tried it with my 400mm Telyt f/6.8 and it works well with the split screen but not the micro prism collar. Split screen is not usable with the 400mm and 2X APO extender which is not too surprizing. The Micro prism collar works very well with all of wide to 90mm lenses and should speed up focusing quite a bit. Was it worth the $105 price tag? My first impression is yes. I will let you know more after I have had more chance to use it. It still is not as bright as my R7 viewfinder but I wasn't expecting that anyway. Dave Saalsaa ------ Unsubscribe or change to/from Digest Mode at: http://www3.telus.net/~telyt/lrflex.htm Archives are at: www.freelists.org/archives/leicareflex/