[JJ_SO]

If you find a valve and a strong enough bicycle pump you can blow it up... With some luck and a really strong pump the black will turn into white.

 

It's because you get with both lenses the same shutter speeds at f/2.8 or any other aperture. That's what you equivalence preachers ignore in big style  DoF is only one thing in a picture.

 

I like Nasim's ideas to that subject: "Everyone's right, Everyone's wrong". And I requite his quote of a reader (who plays sort of same role as some of us here, me included":

 

And I loved this quote by our reader Betty, who summed up a lot of what I have said in this article: “As soon as you start using different cameras (!), with different processing engines (!), different sensors (!) and different pixel densities (!), and then start zooming a lens (!) to achieve or compensate for different crops, all bets are off. Your ‘results’ are meaningless”. What a great way to describe what a lot of us are sadly doing.

It all comes down to the fact that even if one has different cameras with different sensor sizes, we will not carry them and their lenses around but take the picture with what's at hand. With a bit of luck and (even non-scientific) knowledge, the tool will be decent enough.


Btw. the Earth was a disc for quite a while according to scientists, bumblebees can't fly and homeopathy can't help. Using science to explain non-scientific, incomparable things because the differences do matter, leads to wrong assumptions. Which doesn't matter more than ignoring them and use "da wide" and "da long" lens.