If the split image is really affecting the stopped-down metering vs a plain ground glass ( stock ) viewscreen in these cameras at all ( spot or average metereing modes) it could be why Pentax isnt offering one. BUT, once again it just strenthens my case why stopdown metering (GB) with K/M lenses isnt as good as open aperture metering would be and why they should be offering a top model DSLR that fully supports K/M lens functions like OPEN APERTURE metering and AE and then they could do split screens without affecting the metering because stop down metering wouldnt be necessary with K/M lenses if they had a K/M lens aperture cam sensor in there. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Cory Papenfuss Sent: Thursday, April 12, 2007 5:00 PM To: Pentax-Discuss Mail List Subject: RE: Manual focus solution for istD series, Split image RF screen On Thu, 12 Apr 2007, J. C. O'Connell wrote: > I didnt do any controlled testing if this screen has > any measurable change effect on metering, but so > far with program mode using "A" lenses, screw lenses > in AV mode, and PK/M lenses using stop down GB > method I am not noticing any differences visibly. > I use the centerweighted metering mode ususally. > I guess I could put the old screen back in > to do some controlled tests, but I like this > one so much better that there is no way > I am going back to the old screen even > if there is a slight difference so I dont > even want to bother fooling around with > the old screen anymore. The split image really helps on this camera > (istDS) for MF lenses and thats all I use... > jco > I agree with the one I filed down from an old Minolta. With the kit lens (f/5.6) though, I found I have to be careful with eye placement to keep the split prism from blacking out. Also, I'm surprised you say that the GB hack works OK. I've found that with center-weighted (and especially spot), any more than f/8 and it blacks out and overexposes. Certainly not consistent. Bottom line, with S/K/M lenses (almost all of what I use too), many shots require a couple test fires with the check of the histogram to get it right. -Cory > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of Boris Liberman > Sent: Thursday, April 12, 2007 12:08 PM > To: Pentax-Discuss Mail List > Subject: Re: Manual focus solution for istD series, Split image RF > screen > > > John, what about metering, notably center weighted and spot? > > Thanks. > > On 4/12/07, J. C. O'Connell <[EMAIL PROTECTED]> wrote: >> FYI, >> >> Just got this split image RF screen >> for my istDS ( should work in any >> of the istD series cameras ) : >> >> http://preview.tinyurl.com/yu25dy >> >> works fine, nice clear split image >> and a large microprism surround. >> I dont think you can get this from >> Pentax (yet?). Works easily to F4 >> on any lens I tried and still very usable >> to F5.6 on some lenses. Focus seems >> as accurate as the original screen based >> on my tests. >> >> Recommended, and it's cheap for >> the vast improvement it makes IMHO. (P.S. >> dont forget to specify what camera >> you need it for when you pay, he >> makes them for a whole bunch of >> different model DSLRS.) >> >> jco >> >> >> -- >> PDML Pentax-Discuss Mail List >> [EMAIL PROTECTED] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> > > > -- ************************************************************************ * * Cory Papenfuss, Ph.D., PPSEL-IA * * Electrical Engineering * * Virginia Polytechnic Institute and State University * ************************************************************************ * -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net
