On Aug 30, 2011, at 8:07 PM, John Francis wrote: > On Tue, Aug 30, 2011 at 07:25:41PM -0400, Paul Stenquist wrote: >> >> On Aug 30, 2011, at 4:42 PM, Collin Brendemuehl wrote: >> >>> They've got that 55/1.4 that I drool after, >>> so how about a 30/1.4, and a companion 15ish fast lens? >> >> The fast 30 is a worthy goal, but they have a 14/2.8. Can't much faster >> than that without getting really big and expensive. >> >> >>> Perhaps a 100/2 or /1.7? >> >> Probably not enough buyers, considering the price that that a lens that long >> and fast would require-- probably 2K. I think it would require a front >> element of at least 90 mm. > > I rather doubt that. If a 200/f2.8 can be made with a 72mm front element, > I'd expect a 100mm/1.7 to be possible at something smaller than that - > possibly even sharing the same filter thread as the 50-135/f2.8.
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