Re: Official: Fujifilm GFX 50S Medium Format Announced!
freaklikeme wrote: Matt Grum wrote:
GMPhotography wrote:
Dan diffraction hits sooner on a larger sensor than it does on a smaller system. . Using f22 on a large sensor is like death even f16 is bad. You actually have to shoot more wide open than 35 FF .
Tariq Gibran wrote:
Maybe I misunderstand, but I don\'t think this is accurate as a blanket statement.
Actually, we can say that if sensel size is the exact same for the larger sensor as smaller sensor (thus the larger sensor has higher MP\'s), the visual appearence of diffraction is always going to be less with the large sensor than with the smaller sensor at the same output/print size (and, of course, when both are shot at the same aperture).
You might be able to see the effects of diffraction sooner with a medium format sensor if it has the same size pixels, but that\'s a function of the pixel count, not the sensor size, a higher megapixel FF sensor would give you the same effect.
For the same pixel count / FOV / entrance pupil diameter, diffraction is the sme regardless of sensor size.
I do understand where Guy is coming from, Matt, but I think, from what you\'re saying and from my own experience, it has more to do with the lenses. The digital tech camera lenses that were designed with this sensor spec in mind, like the Rodenstock HR 35/4, for example, typically peak a single stop down from their max aperture and then start to lose resolution to diffraction on this sensor. That same 35 on the a7rII peaks at about f/4.5 and then starts to lose resolution. That\'s much different from the way my Canon 35L II performs on the a7rII, where diffraction isn\'t apparent until a little past f/8, and is mild in comparison to the loss on the Rodenstock.
So would the performance difference in those two lenses of like focal length on the a7rII come down to a difference in the entrance pupil diameter?
Yes, there are many variables and I too was thinking maybe both the lenses (better lenses will reveal diffraction effects sooner) and the fact that all medium format sensors did not have AA filters at a time when most smaller sensors did (except Leica of course) could account for the difference as well. If all these variable are kept constant, then the larger sensor will show diffraction effects less than the smaller sensor (same sensel size, technology, lenses dof and so on.)
Sep 20, 2016 at 07:02 PM
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