gdanmitchell Offline Upload & Sell: Off
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Peter Figen wrote:
Diffraction, anybody?
Yeah, at some point we run into limits on image resolution that are not determined by photo site density. If one is really going to make a lot of really gigantic prints it is perhaps time to consider a larger format... though the 33x44 format doesn't get you that much larger at equal resolution — at least not the ratio between old school 35mm and MF film.
There are some other potential values in higher MP that I mention below.
To me it is kind of a "100MP isn't going to change my life, but if has equivalent performance and doesn't cost more and might be useful in some situations," why not? ;-)
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jcolwell wrote:
I'll raise, anti-aliasing?
I hope that a 100MP FF camera, if it actually appears, doesn't have an AA filter. Few people would see any advantage from that at all... especially with the diffraction blur issue that Peter mentions.
If I understand correctly, Canon has recently seemed to move in the direction of AA filtering but weakening it. I could see them doing that, but I'm not sure why. We don't hear a lot of complaints about the AA-filter cancellation system in the 5DsR, nor about the absence of AA filtering in the Fujifilm GFX system.
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jwolfe wrote:
But more precisely on the tech side - jamming that many small pixels on a sensor will probably not resolve much more detail and will probably significantly worsen the high iso performance, making this really a landscape or portrait camera. Which is fine, but my sense is if you printed a 50 mp image and a 100 mp image at 24x36" there would be no discernible difference.
A few observations on that.
First, the thing I agree on:
Based on print tests I've done with high MP cameras in different formats. I agree that virtually no one will notice any difference between prints from uncropped 50MP and 100MP originals at 24" x 36". If you really know what you are looking for, and up close at a nose-length distance, and carefully scan back and forth between the two side-by-side images you might, maybe, sometimes, feel like you could see a difference... but in all likelihood you would not be able to consistently pick the better example.
(I have some stories about pretty stark examples of this that I could tell...)
I think that somewhere around 30" x 40" the resolution advantage might begin to have some effect with real world visibility, but it would still be quite small.
(Still, if — and see below — a higher MP sensor comes at the same price point and with equal or better overall camera performance, why not get it? There are potential advantages other than pure resolution: smaller "noise grain" at high ISO, potentially smoother gradients, potential for cropping.)
Second, the thing about which I'd quibble a bit:
"will probably significantly worsen the high iso performance, making this really a landscape or portrait camera"
That simply has not turned out to be the case over the 20 years during which DSLRs and now mirrorless cameras have been evolving. At _every_ point when photo site density increased, there have been those telling us that this would diminish the performance of the sensors and worsen image quality — we'd lose DR and end up with problems with noise.
They said this when we went for 3MP to 4MP, from 4MP to 6MP, from 6MP to 8MP... from 20MP to 50MP, and onward.
If you compare the same generation of sensors, say that in a 5DsR and a 5DIV or so, the lower MP sensor is going to have better noise and DR performance. But typically the next generation of the high MP sensor improves on the performance of the previous one — it doesn't get worse, it gets better. At every upgrade point, the performance of the new, higher MP sensor has otherwise at least equally and usually improved on the previous generation of high MP sensor.
So, to summarize, I can agree that the advantages of the higher MP sensor may be minimal or even nonexistent for many users, but I disagree that a higher MP Canon sensor is going to perform worse than the 5Ds/5DsR generation of sensors.
Dan
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