On 17/09/06, Eric Featherstone <[EMAIL PROTECTED]> wrote: > On 16/09/06, Shel Belinkoff <[EMAIL PROTECTED]> wrote: > > 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? > > M 35/2 front element is 1 1/16"
The front element of my Summilux-M 35/1.4 ASPH is about 34mm (about 1 1/3") and concave but the filter ring is 46mm. Wide angle lenses particularly special designs don't conform to the simple Gaussian model that most fast 50 primes do. Generally the front element diameter of a fast 50 is simply the focal length / max aperture. -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
