Crop Factor, Low Light and Aperture with m4/3 lenses?

Started Jun 15, 2014 | Discussions thread
texinwien Veteran Member • Posts: 3,326
Re: Handevision Ibelux ?

Truthiness wrote:

Sergey_Green wrote:

tokumeino wrote:

I was actually thinking of lenses like the Pana 25/1.4 which is 1 stop behind a Sony FE 55/1.8.

Yes, it is 50/2.8 equivalent. An Ok to have, but nothing to give you an edge when it comes to DoF and light. And stopped down to f/2.8 fast FF lenses do usually produce better results, than a wide open on a smaller formats equivalents.

Additionally there is one inherit advantage larger formats have over smaller ones: enlargement factor. A large format image needs to be enlarged less than a medium format image, which needs to be enlarged less than FF image which needs to be enlarged less than APS-C image which needs to be enlarged less than m4/3 image which needs to be enlarged less than cell phone image

This inherent factor is taken into account by switching from "Screen" to "Print" when viewing DXO's measurement graphs.

and when less enlargement is needed, the lens is stressed less,

What does "the lens is stressed less" mean? Is that accepted optics terminology? Do you have some links to authoritative sources that talk about this in more detail?

thus the lens can be of lesser quality to achieve the same image quality.

Lesser quality in what respect?

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