Oops :-) On Fri, Dec 22, 2006 at 07:01:13PM -0500, Paul Stenquist wrote: > And the DA 14/2.8. > Paul > On Dec 22, 2006, at 6:58 PM, John Francis wrote: > > > On Fri, Dec 22, 2006 at 12:53:26PM -0800, Shel Belinkoff wrote: > >> There is a photo I'd like to make, but the widest lens I have is > >> still too > >> long as it forces me to include an undesirable object in the frame > >> and I > >> don't want to mess around with cloning the object out of the > >> scene. I will > >> need to borrow a wider lens, but I don't know what focal length > >> would work. > >> Is there a way to determine the focal length I need based on the > >> subject > >> distance and framing I want using the longer lens. I know how > >> close I must > >> get to the subject to eliminate the unwanted element. Perhaps a > >> formula of > >> some sort? > >> > >> For what it's worth, the subject is about 12-feet long and I have > >> to get > >> about six feet from it. > > > > > > So, as you know now, for APS-C the answer is somewhere around 15mm > > (give or > > take; I assume your distances quoted above aren't absolutely precise). > > > > That leaves you with three or four choices: > > > > o The A 15mm > > > > o A DA 16-45, if you can get away with a 16mm > > > > o The DA 10-17 fisheye zoom, if distortion is OK > > (although you can defish the image digitally) > > > > o The DA 12-24; probably your best choice. > > > > I don't know what access you have to loaner lenses, but if > > you decide on the fisheye I've now got one of those in my bag :-) > > > > > > -- > > 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
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