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

Started Jun 6, 2014 | Discussions thread
JackM Veteran Member • Posts: 8,447
Re: What about medium format or larger?

forpetessake wrote:

Manufacturers lie all the time, it's called advertisement!

When they convert the focal length to the FF equivalent and conveniently forget to convert the f-stop as well they intentionally want to confuse the ignorant buyers blah blah blah

Except f2.8 at ISO 200 will meter the same shutter speed on FF, APS-C, m4/3, and on and on, so there is no need to convert f-stop.

Furthermore, it is an immutable mathematical fact.  Focal length divided by f-stop = aperture size, and that is that.

 JackM's gear list:JackM's gear list
Canon EOS 5D Mark IV Canon EF 100mm f/2.0 USM Canon EF 70-200mm F2.8L IS II USM Canon EF 24-70mm F2.8L II USM Canon EF 16-35mm F4L IS USM +5 more
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