I'm talking about the lens diameter, not the barrel diameter. For example, the diameter of the front element of my 35mm Summicron (f/2.0) is about 1-inch while the front element of my Pentax 35mm f/2.0 is 1.5-inches. I'd be curious what the diameter of the front element is on an M or A 35mm 2.0 ... anybody got that figure?
You mention "later design." That implies that the lens diameter (just the glass) is smaller than earlier models. If that's the case, then it should be possible to design a smaller diameter lens for a DA than for film - at least that's one way to look at it. Shel > [Original Message] > From: Adam Maas > Shel, They are, because they have a far simpler aperture design. No > aperture coupling or full-aperture mechanism is required for an RF lens, > not to mention a smaller-diameter mount (which allows smaller-diameter > barrels). But even so, fast RF glass isn't all that much smaller than a > Pentax 50mm f1.4 of SMC-M or later design. > > -Adam > > > Shel Belinkoff wrote: > > I'm not sure that's correct ... I'll have to check the diameter of my Leica > > glass. It seems to me that the lenses for my Leica, compared to the same > > focal length/aperture of my Pentax glass, are smaller. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
