A quick question ... what is the approximate exposure range for UV photography? I followed a lightmeter reading done through a Hoya UV (black) filter ...but I just realised I may be getting the exposures all wrong. ----- Original Message ----- From: "Kelvin" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 16, 2001 11:26 AM Subject: Re: [Cameramakers] re: field curvature and coverage, curved field camera? > hi Bob > > That's a very interesting article on UV photography. I played with some UV > photography recently and > got back erm, no results. Used a Super Tak (monocoated) 50/1.4 , Provia and > a black UV filter. > > Guess the lens has too much glass. Maybe Provia wasn't the right film...but > someone suggested it > works. > > Since we can't use most glass lenses except possibly some tessars (as you > suggested) ... any > suggestions which cheap lenses are of a tessar design? > > Furthering your idea of using mirror lenses as an alternative, how about > using a Holga > which has a plastic lens? Would light leakage be a major problem with UV > photography? > And besides, being somewhat scale focus, fixed aperture and having a > viewfinder composition, > there is a lot less to worry about. > > I'd just mount the black UV filter on top of the lens and compose with the > viewfinder. > AND...the Holga has a widish angle 60mm lens. > > ----- Original Message ----- > From: "Robert Monaghan" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, January 14, 2001 11:30 AM > Subject: [Cameramakers] re: field curvature and coverage, curved field > camera? > > > > > > which raises an interesting question; is there a really wide field simple > > design which would yield better results if the film plane were properly > > curved? IIRC, we used to have a slightly curved film holder assembly for > > some of our telescope setups (60" Bethany observatory at Yale)? I know > > the minox had a curved film plane IIRC too for similar reasons, right? > > > > one reason I am interested is for ultraviolet photography using quartz > > optics, where each element costs major $$; a fairly simple few element > > design for wide angle work would be handy ;-) > > > > regards bobm > > > > PS see http://www.smu.edu/~rmonagha/mf/uv.html on UV photography etc. > > using uncoated low cost lenses and making quartz optics and filters etc > > _______________________________________________ > > Cameramakers mailing list > > [EMAIL PROTECTED] > > http://rmp.opusis.com/mailman/listinfo/cameramakers > > > > _______________________________________________ > Cameramakers mailing list > [EMAIL PROTECTED] > http://rmp.opusis.com/mailman/listinfo/cameramakers > _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
