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Old Oct 2, 2005, 6:21 PM   #1
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Hey everyone,

I am in need of a lens for a Canon D20 dSLR that has wide angle. I need it to be able to produce an image over a 25x26cm area at46cm/18"distance (maybe 24-28mm...?). It does not have to have IS built in (if any even have them, I don't know). I'd like it to have minimal zoom capability, but that is not required. If any lenses go below F2.8, that would be a plus. We currently use F1.4 lenses - and used to sell F.85 lenses (but, can't find them anymore).

I am completely new to dSLR technology and don't know what my options are for this type of setup. Also, keep in mind that the distance to subject is static. 18"is my working range and it will not likely change.

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Old Oct 2, 2005, 7:59 PM   #2
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i think the angle of view you're looking for is somewhere along 42 degrees.

my math (i'm not sure if the angle of view is only the horizontal or both, so i assumed the latter):

a 25 x 26 frame, take the diagonal ~= 36cm
from a distance of 46cm, the angle is 2[ tan inv (18/46) ] ~= 42

you can use cosine law but i think its faster this way (i only have the comp calc on me...)

anyway, there's the sigma 30mm f/1.4 ... it's angle of view is 45 degrees.

for something a little narrower, You can try the canon 35 f/2 or the canon 35 f/1.4L...

as for zooms, there's the canon 16-35 f/2.8L, or sigma 18-50 f/2.8 ... my best guess...
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Old Oct 2, 2005, 8:16 PM   #3
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FYI - http://www.dudak.baka.com/fovcalc.html

-> there's also the two 24-70 f/2.8's from Canon and Sigma (as well as the Tamron 28-75 f/2.8...)
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