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

Started Jun 6, 2014 | Discussions thread
forpetessake Veteran Member • Posts: 4,895
Re: What about medium format or larger?

JackM wrote:

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.

And it looks you understood exactly nothing in this thread. What's your definition of the "need"? Is there a need to convert the focal length? Do you understand the equivalence? What it actually means and why do people do those calculations? I think not.

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

So what? You can divide or multiply anything upon anything, what's the meaning of it? What's the meaning of f-stop? Why is it important? You don't seem to know.

What's surprising in these forum discussions is not the ignorance per ce, it's the arrogance -- people are ignorant even about their ignorance, but they got somewhere the idea that they understand what they are talking about. No wonder they never learn anything.

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