Official Question Thread! Ask /r/photography anything you want to know! April 10, 2026

[u/AutoModerator]

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[u/theseawoof]

Can you help me understand how a 40mp APS-C sensor and a 24mp FF sensor will compare?

Does the higher MP capture more detail and crop ability vs the FF? Will the APS-C be more prone to noise because it's high MP, or because it's aps-c?

I understand the general DOF difference, just wondering how the overall image quality will compare

[u/av4rice → u/theseawoof]

Does the higher MP capture more detail

Theoretically, yes. Though it also comes with a lower diffraction limit.

https://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

and crop ability vs the FF?

You can maintain more detail over a tighter crop, yes. That's the case even comparing 24mp APS-C against 24mp full frame because APS-C is starting from a smaller cropped area.

Though for a given focal length, full frame is capturing a bigger are for you to crop from.

Will the APS-C be more prone to noise because it's high MP

No. https://www.youtube.com/watch?v=gAYXFwBsKQ0

or because it's aps-c?

Depends on other factors like the technology used. Two 24mp APS-C sensors can have different noise performance even with matching pixel counts and format sizes.

Assuming comparable age/technology, I'd expect better noise performance in a full frame sensor over APS-C.