Perspective would be identical if the lenses were accurately proportioned at a ratio exactly matching that of the film area vs. the APS-C sensor. The AOV would match as well. Both are virtually identical in the examples. No one, to my knowledge has ever suggested that DOF would be the same. Wheatfield has groused over discussions that use 35mm focal lengths to represent the AOV of a lens on APS-C. To me, it doesn't matter a lick. Whatever works.
> Perspective is quite similar, however the DOF tells which is which. And > points > out that comparing them that way only tells part of the story. Which shows > what > Wheatfield and I have been trying to say all along. > > graywolf > http://www.graywolfphoto.com > "Idiot Proof" <==> "Expert Proof" > ----------------------------------- > > > Dario Bonazza wrote: > > To me, they look equivalent. Yes, different color balance, but this > > depends on white balance and film in use. Just either a bit more exposed > > the 18mm, or some underexposure for the 28mm, depending on the details > > you look at. Small difference in AOV, which could also be visible using > > two different lenses of the same focal length on the same camera. Same > > perspective and same everything, as it should be. Thanks Shel, this > > picture is worth a thousand words. > > > > Dario > > > > ----- Original Message ----- From: "Shel Belinkoff" > > <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Thursday, July 21, 2005 2:17 PM > > Subject: Theory of Equivalency > > > > > >> Last week we talked about whether or not an 18mm lens on a Pentax DSLR > >> and > >> a 28mm lens on an SLR were equivalent. Saturday my friend and I > >> tested the > >> concept. Here are the results. You decide how close the two lenses > >> are to > >> being equivalent. > >> > >> http://home.earthlink.net/~pdml-pics/2818.html > >> > >> Shel > >> > >> > > > > > > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.323 / Virus Database: 267.9.2/55 - Release Date: 7/21/2005 >
