Peter, Yeah, you do 99.5 for say 11 air to glass surfaces and you end up with a number that is not quite so large. BTW, you should tell Eric that you drive a La Salle, not a DeSoto! Jerry "Peter K." wrote: > OK Eric. I guess with your vast knowledge of the optical world you > must be right. I am just a poor soul who only uses cameras. ;-) Did > not realize you were so experienced in optical design. Peter KOn > 5/21/06, Eric Goldstein <egoldste@xxxxxxxxx> wrote: > > Modern coatings pass 99.5+%... no longer an issue... > > You're livin' in the past, dude... Now let's drop the top on > the > DeSoto and go for a little spin... ;-) > > Eric Goldstein > > > On 5/21/06, Peter K. <peterk727@xxxxxxxxx> wrote: > > And more air to glass surfaces can be interpreted as more > problematic too. > > > > > > On 5/20/06, Eric Goldstein <egoldste@xxxxxxxxx> wrote: > > > > > Ordinary more elements means more degrees of freedom means > higher > > order corrections, but as these are two entirely different > designs, > > one retrofocus, we are comparing apples and orangutans... > > > > Eric Goldstein > > > > -- > > > > On 5/20/06, Peter K. <peterk727@xxxxxxxxx> wrote: > > > > > > The Planar on your 2.8E is a 5-element lens and the SL66 > a 7-element lens. > > > Technically with less elements the 2.8E Planar should at > least equal or > > > ourperform the SL66 lens, but I would tend to think the > more modern design > > > of the SL66 lens compensated for the additional > elements, so it is > > unlikely > > > you will see a difference unless you go to a print of > about 40x40. > > > > > > Peter K > > > > > > > > > On 5/19/06, Richard Sintchak < rich815@xxxxxxxxx> wrote: > > > > > > > > > > > > > I'm having a hard time distinguishing whether my SL66 > 80/2,8 Planar is > > any > > > better or worse than my 80/2.8 Planar on my Rolleiflex > 2.8E TLR. Then > > again > > > I highly suspect they are identical. > > > > > > > > Richard S. > > > > > > > > > > > > > > > > On 5/19/06, Jeff Dilcher < dilcher@xxxxxxxxxxxxxxx > > wrote: > > > > > > > > > > > > > > > My 80mm lens has a lens hood. Unfortunately, some > of the > > > > > non glare "coating" on the inside of the lens hood > has peeled > > > > > off, leaving a shiny subsurface visible. I haven't > used it > > > > > much because I am afraid the glare from the shiny > areas will > > > > > defeat the purpose of the lens hood! > > > > > > > > > > If you want to start some interpersonal disputes, > let me hang > > > > > this question out there- > > > > > > > > > > Do the lenses created for the SL66 produce sharper > images than > > > > > the built in lenses on the TLR Rolleis? > > > > > > > > > > I wonder if anyone might have a strong opinion? > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Fri, May 19, 2006 at 10:12:47AM -0400, Dan Kalish > wrote: > > > > > > > > > > > > > > Date: Fri, 19 May 2006 00:55:36 -0400 > > > > > > > From: Craig Roberts < crgrbrts@xxxxxxxxxxx > > > > > > > > Subject: [rollei_list] WTB: SL66 thingies > > > > > > > > > > > > > > Good morning fellas. > > > > > > > > > > > > > > I'm still looking for the elusive 80 - 150 lens > hood for my quaint > > old > > > > > > > SL66. Anybody got a spare, please? By the way, > any other SL66 > > fans > > > > > > > around? We're getting as scarce as the lens > hoods. > > > > > > > > > > > > > > Many thanks! > > > > > > > > > > > > > > Craig > > > > > > > Washington, DC > > > > > > > > > > > > I'm a SL66 fan. I subscribe to this list for > those rare occasions > > when > > > > > > something about an SL66 is posted. Sometimes a > new link is > > worthwhile. I > > > > > > don't have enough discipline to ignore everything > else -- the > > interpersonal > > > > > > disputes are just too funny to ignore. > > > > > > > > > > > > Dan > --- > Rollei List > > - Post to rollei_list@xxxxxxxxxxxxx > > - Subscribe at rollei_list-request@xxxxxxxxxxxxx with > 'subscribe' > in the subject field OR by logging into www.freelists.org > > - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with > 'unsubscribe' in the subject field OR by logging into > www.freelists.org > > - Online, searchable archives are available at > //www.freelists.org/archives/rollei_list > > > > > > -- > Peter K > Ó¿Õ¬ > > ---------------------------------------------------------------- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.0.392 / Virus Database: 268.6.1/344 - Release Date: > 05/19/2006 >