At 2:52 PM +0000 3/29/06, [EMAIL PROTECTED] wrote:
Thanks Cotty and Henning -
I'm pretty much following you - been chewing on it. Forgive me,
this is the first time I've really tried to get a grip on this
question. I think I do understand what is discussed in Mike's
article.
Let me rephrase the question: in 35mm format my favorite w/a is
24mm, not just because I like the FOV, but also because for me it's
the widest lens that still looks "normal" - wider lenses seem to me
to call attention to themselves as sort of "special effect" lenses.
I think even in a rectilinear lens, there's a lot of keystoning,
pincushion and various other linear alterations. Maybe "distortion"
is the wrong word.
So, on a 1.6 format camera, to get the same FOV as a 24mm I need to
use a 15mm lens, but on a 35mm camera a 15mm lens is practically a
fisheye. If I take a photo in 35mm with that lens and then crop it
in PS by 1.6, those stretched lines are still evident.
Therefore what I'm understanding - and help me out here - is that
the same thing is going to happen on a 1.6 DSLR, that 15mm lens is
still going to be a 15mm lens with all its innate characteristics,
and the only way I'm going to get a photo similar to the one I take
with a 24mm on my 35mm is with a FF DSLR.
AND, if that's true, is all of the above also true with lenses whose
image circle has been adjusted for the small sensor, as in EF-S
lenses?
Thanks for bearing with me here.
Ken
Ken, if you shoot with a 15 on a 30D, it will look just like a shot
with a 24 on a FF camera. Not like a 15 shot on a FF camera. Neither
have anything to do with fisheye per se, unless one of the lenses has
a geometry correction like a fisheye, in which case the shot with the
30D will look like a cropped fisheye shot.
So, if you like the look of a 24mm lens on a film or FF camera, then
you'll want a _rectilinear_ 15mm lens, or at least a fully
correctable 15mm lens. Your best bet is to get one of the short zooms
designed for APS sized sensors, like the Canon 10-22, Sigma 10-20 or
Tokina 12-24 that include 15mm in their focal range. The only fixed
lenses that come close are ones like the Canon 14/2.8, which is quite
large, extremely expensive and not that good.
The only difference is that at the same numerical aperture, the 15 on
the 30D will give you more depth of field than the 24 on film.
--
* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:[EMAIL PROTECTED]
|[ ]| http://www.archiphoto.com
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