Archived posting to the Leica Users Group, 2001/03/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Mon, 19 March 2001, "Jason Hall" wrote: > > > Excuse my naivete but I do not understand what Dick Gilcreast means > when he > > comments in Volume 28 No 2 1995 on the SL that "the central > microprism is > > cut for the relatively large lens speed of f2.8 ...and is therefore > > relatively more accurate shooting at f2". He also says that the best > lenses > > to use with the SL screen are f2, f2.8, f3.4 and f3.5 lenses. > > He means that the central miscroprism partially blacks out past f4 and > the surrounding ground glass has to be used for focusing, between f2.8 > and f4 it is less effective than at f2 unless you are focussing on a > bright subject. > > > He makes similar comments about the outer prisms being "cut for > about f5.6". > > Im not sure what he means by this, my SL appears to be plain ground > glass outside the central microprism and is usable stopped down past > 5.6 although it does become more difficult to focus. I believe there > is more than one type focus screen installed in the SL though and I > only have one example, I also dont have any lenses slower than 2.8, I > was testing by stopping a 50 Summicron down with the DOF preview. > > Maybe Doug can comment further, I've been thinking of adding a slow > Telyt to my kit and hadnt considered the screen until reading your > comment above. > > Jason Hall ?? why on earth would anyone think I'd read a message with the subject line "Leicaflex SL" ?? <g> The area outside the SL's central microprism area looks like ground glass but AFAIK it's composed of extremely small microprisms. The SL's standard viewscreen works extremely well with the f/6.8 Telyt. Some SL bodies have plain matte viewscreens (a special-order or retrofit item) that was intended for use with longer lenses. I haven't used an SL with this viewscreen. Since I can focus on flying birds with the standard screen I don't feel the need for the other viewscreen. The central microprism area is more difficult to use at f/6.8 so those who would rather focus in that area might prefer the matte viewscreen. BTW the SL2's standard viewscreen with the split-image focussing aid can also be installed in the SL. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com ___________________________________________________ The ALL NEW CS2000 from CompuServe Better! Faster! More Powerful! 250 FREE hours! Sign-on Now! http://www.compuserve.com/trycsrv/cs2000/webmail/