My understanding is that they achieved 1.8 by betting the aperture blades to open just a wee bit more. No other changes... Regards, Bob S.
On 3/26/07, Wilko Bulte <[EMAIL PROTECTED]> wrote: > On Mon, Mar 26, 2007 at 01:02:39PM -0500, Bob Sullivan wrote.. > > 40 years since they made these lenses. > > The 2.0 and 1.8 are optically equivalent (elements, etc.) > > What is it that accounts for the difference in speed, do you know? > > > Any competent repairman could have salvaged 1 good lens from 2 poor ones. > > The build quality is excellent. I once had one of mine apart for servicing, > this is just a different league from all that plastic stuff we have these > days >:-| > > Wilko > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
