Is a 300mm @21mp same as a 600mm@10mp?

Started Nov 14, 2008 | Discussions thread
Victor Engel Forum Pro • Posts: 18,487
Re: Nice, but why not vertical?

saynomore wrote:

Isn't vertical (the shorter dimension) better to compare cameras with
different ratios? Or are crop factors (for instance, the 2x of
FourThirds) calculated based on the horizontal? I guess I could just
look up the specs...

EDIT: Yeah, looking at the specs, horizontal it is. I still think
vertical is more relevant to come up with crop factors though.

I wasn't going to mention this, in order to be as simple as possible. You can use any linear dimension. Possibilities are horizontal, vertical, diagonal, and square root of megapixel count. Just as long as you use the SAME dimension for each camera.

I could have obfuscated things further by mentioning aspect ratio, but I chose to assume any camera being considered used the same aspect ratio, so it can be ignored.

 Victor Engel's gear list:Victor Engel's gear list
Canon EOS 5D Canon EOS 5D Mark II Canon EOS 600D Canon EOS 5DS Canon EF 50mm f/1.8 II +12 more
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