That lens is not suitable for a 5DsR is disinformation

During my pre-purchase research I run into many threads of people alleging to the fact that glasses without the best optics perform poorly on a 5DsR body leading to the common belief that a 50 mpx body maximizes any lens flaw and requires only the best and recent glasses.
After 4 months of 5DsR extensive use I totally disagree with the above.

I have been looking through my last 2 years of pictures taken with 6D and 5DsR for a printing project and just figured out that obviously the best glasses help resolving the 50 mpx sensor but the improvements are even more noticeable when "average" glasses are used. In fact the outcome produced by the 24-105 f/4 L v.1, 85 1.8, 70-200 f/4 L from the 5DsR files blows the same files from the 6D out of the water. These lenses on the 5DsR are sharper and better in every regard at low iso.

I'm not looking for an answer - just giving (some of you) food for thought...

Cheers
Francesco

Another example of not to believe everything you read on the internet, and not everyone is an expert on the net, even though they think they are.

Was anyone else looking at his avatar whenever he said "glasses" ?

The claim never made any sense. Think about it, if the lens performs poorly on the 5DsR then it will perform worse on the 7DII, 7D, and every recent Dxxx camera as their pixel density is even greater.

gjl711 wrote in post #18302182
The claim never made any sense. Think about it, if the lens performs poorly on the 5DsR then it will perform worse on the 7DII, 7D, and every recent Dxxx camera as their pixel density is even greater.

Well, a FF lens that performs well on the high-density crops would need to be sharp enough across the field instead of just in the crop-size center. That is assuming, though, that the user needs full sharpness across the frame.

Uhm... "not suitable" is a big claim.
I think it should be translatead as: "these lenses, wide open, will not fully resolve the available sensor resolution over the entire frame when shooting test charts".

Now, if photography was all about sensor and lens resolution, it would not be an art.

I've noticed on the Dxo site that there's some correlation between pixel count and lens performance in terms of sharpness. The bigger the sensor, and the bigger the pixel count, the better a lens' sharpness.

iowajim wrote in post #18302545
I've noticed on the Dxo site that there's some correlation between pixel count and lens performance in terms of sharpness. The bigger the sensor, and the bigger the pixel count, the better a lens' sharpness.

I don't think that the lens is sharper but the sensor can resolve more detail.

iowajim wrote in post #18302545
I've noticed on the Dxo site that there's some correlation between pixel count and lens performance in terms of sharpness. The bigger the sensor, and the bigger the pixel count, the better a lens' sharpness.

That is because DXO uses sensors to "read" the lens sharpness, what matters here is only sensor element density.
If a lens is "sharper" on a denser sensor it is only because the other sensor was not dense enough to fully resolve the lens.

Thinking about it a bit I guess you can tell if the camera is out resolving the lens when you move to a higher density camera and there is no increase in resolution. So far I have never seen that but I think it's because we still have a way to go before sensors become so dense that an increase in sensor resolution will not result in an increase in image quality.

Exactly, unless the lens is quite bad.

gjl711 wrote in post #18302182
The claim never made any sense. Think about it, if the lens performs poorly on the 5DsR then it will perform worse on the 7DII, 7D, and every recent Dxxx camera as their pixel density is even greater.

I think the issue the OP is alluding to is that some lenses have less resolving power than others and wouldn't be able to take full advantage of a higher resolution sensor.

i've had my 5DSr for about a year now and have used a number of my lens (both prime and variable) with it. My favorite being my 11-24. That said I haven't found that I have a lens that won't work with the body in terms of IQ. I will agree that the 51mp could reveal any short-comings in a lens but I have found my biggest problem with IQ detail is in doing the DOF right and keeping the camera from any movement whatsoever.

I've also found that this is not a body that I would ever try and use for all of my work. The detail is fantastic but for the vast majority of my work the 80D and the 1Dx are just great.

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mwsilver wrote in post #18307470
I think the issue the OP is alluding to is that some lenses have less resolving power than others and wouldn't be able to take full advantage of a higher resolution sensor.

This is absolutely correct, and has been proven time and time again with bench tests. But the OP seems to be saying that this is not true.

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Tom Reichner wrote in post #18307990
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This is absolutely correct, and has been proven time and time again with bench tests. But the OP seems to be saying that this is not true.

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That's likely what he's implying, but perhaps what he was really trying to convey was that the 5Dsr sensor will allow lenses to reach their full potential. Clearly resolving power can vary greatly and all lenses are not created equally.

Others have suggested that regardless of bench tests it's the real world results that count.