35mm = to 50mm on cropped sensors?

divided

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So if i wanted a true 50 mm FOV on my XTI, i would need a 35mm lens? Is that correct? Along the same logic, does that make my current 50mm 1.8 prime, eqivalant to a 85mm on a 35mm camera? IS this all correct or am i missing something? Is their a chart anywhere with all the conversions for cropped sensored cameras?
 

Alex_B

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with respect to the angle of view provided you are approximately right.

however, even though the angle of view is approximately the same for a 50mm on full frame and a 35mm on a 1.6 crop, depth of field will be different. The smaller sensor gives more DOF than the larger sensor at the same aperture.
 
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divided

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The smaller sensor gives more dof, does that mean more is in focus while shotting wide open? If not, can you clairfy, thanks.
 

Alex_B

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more or less, yes, if the distance to the subject is the same.

p&s cameras with their extremely small sensor have a very deep DOF, which for example sometimes makes it impossible to get a blurred background
in a protrait ... even in cases where on a 35mm full fame SLR a slow lens would give a DOF shallow enough.
 

Alex_B

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uhm .. technically my typing was certainly not 100% well phrased ... but practically this is how things behave.
 

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you basically have it all right, my man.

But you don't really need a chart. Multiply your regular lens by 1.6 and you get the equivalent when you put it on a crop camera.
 

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at first glance this seems bad because you lose wide angle photography, but your telephoto lenses have a greater effect, and if you want wide angle photography EF-S lenses(can only use on crop sensor bodies) go down to 10mm, or a pricey sigma fisheye goes to an astounding 8mm
 

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Alex_B - thank you for confirming that I'm not crazy. :)

I recently upgraded to a DSLR from a P&S and noticed way more bokeh (I think that's what it's called) in my pictures at wider apertures. It's much easier to get something to pop off a background.
 

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