fisheyes have focal lengths that get smaller off axis. the stated focal length is the center region. a 16mm may not give any more overall angle of view than a 17mm from corner to corner. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of P. J. Alling Sent: Friday, June 15, 2007 4:37 PM To: Pentax-Discuss Mail List Subject: Re: 17mm f/4 Fisheyes don't work that way. I think the diagonal corner to corner coverage of the 16mm is exactly the same as the 17mm. But I can't find where I read that at the moment. Mark Roberts wrote: > Rick Womer wrote: > > >> You're not going to get much fisheye effect at 17mm >> unless you're getting a 1DS. >> > > I'd be curious to see just how much fisheye effect does show up. > Cotty's 1D-II is a 1.3 crop, so it ought to be more apparent than on a > 1.5 or 1.6 crop camera. > > Another lens to consider is the Pentax SMC A 16mm fisheye. Only 1mm > wider but every millimeter makes a big difference at these focal > lengths, especially with a cropped-format sensor. > > >> Tokina makes the 10-17 fisheye zoom in a Canon mount. >> Of course, you would miss the sadistic glee of a mount >> transplant without anesthesia... >> > > I'd like to know if the Tokina lens covers the 1.3-crop sensor (thery > certainly don't warn against it). That information could be interesting > in many ways :) > > > -- All dogs have four legs; my cat has four legs. Therefore, my cat is a dog. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
