Full Frame sensor does not necessary giving you better IQ than smaller sensor

Started 6 months ago | Discussions thread
hjulenissen
Senior MemberPosts: 1,626
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Re: Full Frame sensor does not necessary giving you better IQ than smaller sensor
In reply to yfan, 6 months ago

yfan wrote:

If you look at image quality comparison pictures in this site, it’s not difficult to draw conclusion that FF is about one full stop better than APS-C.

Are those comparisions staged to get:

1. "Equivalent" images? (if so, what is the goal DOF etc, and what happens to cameras that cannot reach it?)

2. Optimal noise for each camera?

3. Optimal sharpness for each camera?

...

It might be that a Canon 5Dmk3 with the 85mm f/1.2 at maximum aperture, 1/100s and ISO to suit provides less noise than a Canon 70D with the 50mm f/1.2 at maximum aperture, 1/100s and ISO to suit. This does not mean that the FF system will necessarily have less noise for those that happens to need more moderate DOF.

This leads me to something that bugs me: FF does not (seem to) have "1 stop less noise than crop". FF allows you access to lenses that (often) will have larger max apertures, thus shining more light onto the sensor, thus giving less noise. They will also allow you access to lenses that (commonly) resolve more details per image, and along with (commonly) higher pixel counts, one might expect larger sensor systems to be able to give more spatial details in ideal conditions.

This has to be balanced by the slower model update and less state-of-the-art sensor technology often used in larger sensor systems, as well as cost/weight/size issues. For some photographers, "resolution density" might be more relevant than total resolution (e.g. macro or extreme tele).

-h

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