Crop Factor. Something to consider when buying a lens when you are shooting other than FF.

Started Jun 6, 2014 | Discussions thread
OP dtssounds New Member • Posts: 5
Re: Crop Factor. Something to consider when buying a lens when you are shooting other than FF.

Simion1 wrote:

But a 10-24mm f4 isn't a 15-35mm f6. The light gathering properties are still f/4.

As for your comment "That is why many people using such lenses on APS cameras are having a hard time throwing the background out of focus". I have no problem throwing the background out of focus with a Canon APS-C body with 24mm 1.4 and 50mm 1.2 lenses, or even a 70-200. If anything with the primes I have to stop them down to prevent parts of the photo being out of focus due to too shallow DOF. Maybe you'd be better off getting closer to your subjects if your aim is shallow DOF.

Well yes the light gathering capability will still be f4. But this thread is about comparing the DoF between different sensor sizes when trying to achieve the same angle of view and using the same f stop.

Maybe this will help.

http://www.youtube.com/watch?v=Es7gK3V22hM

Or if you prefer to read...

http://admiringlight.com/blog/full-frame-equivalence-and-why-it-doesnt-matter/

And as for the comment "That is why many people using....." I take it back. My bad, it got away from my censorship.

Cheers!

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