Do you believe that some Canon lenses have the resolution ...

Here is the Moon taken by the NEX7 and 500L plus 2XIII extender. Applied Dynamic Contrast then brightened the photo in Photoshop. No sharpening or noise reduction.

Vince





NEX7 with 500L plus 2XIII.  f/8  1/500sec  ISO100
NEX7 with 500L plus 2XIII. f/8 1/500sec ISO100
 
My anecdotal experience suggests that most Canon L lenses have plenty of room re resolution.

Vince
You do see more resolution from it when you are using 36 MP FF sensor (compare to 21 MP FF Canon) ? This is what my experience too, when using 18 MP APSC. I compare it with APSC crop from 5DII (21 MP --> 8 MP). The result is 18 MP APSC has more resolution. The lens is support that density, at least in the center of the lens. Can't say for the corner of the lens, since my 7D is using only the center of it.

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Brian
 
While testing lenses at work, I was amazed at how good lenses could be on axis, when critically focused, and how easily they lost that resolution away from best focus.
 
...if future advances in ADC performance does not partially explain why Canon isn't busting a gut at the moment to compete with 'only' 14 stops of DR at base ISO.
I don't know if an exodus out of Canon is coming but if they doesn't come with a breakthough sensor after Photokina, I will start my migration to Sony or Pentax Z.
Hmm. I guess threatening to leave might make you feel better for a while, but whether eventually you do or not but that'll be the total impact it'll have. Sorry.
My post was a sharing moment with all dpr fellows and not a threat to Canon. Sorry, for that there must be a complain department at Canon Inc.
 
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My anecdotal experience suggests that most Canon L lenses have plenty of room re resolution.

Vince
You do see more resolution from it when you are using 36 MP FF sensor (compare to 21 MP FF Canon) ? This is what my experience too, when using 18 MP APSC. I compare it with APSC crop from 5DII (21 MP --> 8 MP). The result is 18 MP APSC has more resolution. The lens is support that density, at least in the center of the lens. Can't say for the corner of the lens, since my 7D is using only the center of it.
Of course 36mp > 21mp to have more resolution. Of course your 7D will resolve more if you shoot from the same distance and unable to move closer such as in moon shot than your 5D2.

Telescope lenses (some are not expensive at all) at FL 2000 mm+ with max aperture F10 or more, can resolve moon surface lots better than Canon 500L with 2.0x TC and lots cheaper. 24mp NEX-7 can resolve more than 36mp A7R if you crop A7R photo to fit NEX-7's AOV. But that doesn't mean NEX-7 is better than A7R, doesn't mean that cheapo telescope lens is better than 500L.

Resolution is one thing, sharpness and overall optical quality are other things. In wildlife photography, if I can move closer with 500L to fit the animals into FV sufficiently, I have no reasons to use TC especially with 2.0x TC that compromises IQ quite a bit. Birding photog will use 800L with or without 1.4x TC that outresolves 500L with 2.0x TC and noticeably sharper cropped to the same AOV.
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http://qianp2k.zenfolio.com/
 
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Of course 36mp > 21mp to have more resolution.
True.

I don't know if there such a worst lens that isn't worth to use it above 5DII's pixel density.

If such a lens is exist, then it's little (or zero) benefit to use 36 MP sensor over the 21 MP one.

So I think max resolution is a combination between sensor resolution and lens resolution.

Of course other factors could affect the resolution : camera shake, focus, diffraction, etc.

Though 12 MP is already plenty for most application (or situation), for most people.

I am using G1X (not the mark II) myself, and I believe its max resolution is less than 12 MP.


But I know that you are not in the most people category,

and that's a compliment, Peter.

I know that you are stitching, I consider you are not satisfy with current camera's resolution can give you, at least not in one shot picture.

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Brian
 
that could maximize 50 MP in FF, so it will have the same resolution as the 50 MP MF with its lens ?
NO
Or is it just too difficult (impossible) to make a such lens that sharp ?
YES
So the only way at the moment is just to make the sensor larger, thus less stretch for the lens ?
YES. Resolution of the lens and pixel density of the sensor go hand in hand. If you have a small sensor with a big number of pixels (50mp as you suggest) than
I could understand if smaller format (such APSC or mFT) will have another problem, DOF control problem, even if someone could make a lens sooo sharp for them.

But there is no DOF control problem in 35mm FF, is there ?
But it has. The maximum sharpness (and so the resolution) of a lens is achieved at 1-2 stops down from it's maximum aperture. So if you have let's take for example an 50mm f1.4 than to use the maximum resolution of the lens you would have to shoot at f2. And then you have a very shallow depth of field. That is why we say that you have DOF control actually, not because you cannot achieve the DOF you want. FF can achieve shallower DOF than APSC or MFT. But in order to achieve maximum sharpness you need to shoot at a wide aperture and so you have a very shallow depth of field.

Sharpness is usually needed in shooting landscape and product photography. That is where you normally shoot f9 up to f16. Or even f22 for small products when you shoot with a macro lens. But after f9 difraction critically lowers the resolution that you can achieve with a certain sensor/lens pair. And the bigger the pixel density, the difraction kicks in faster.
Maybe just resolution problem in wider aperture ? in f/2 perhaps ? But not resolution in f/2.8 ?

Some one who know these, please chime in ...

Thanks

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Brian
 
Of course 36mp > 21mp to have more resolution.
True.

I don't know if there such a worst lens that isn't worth to use it above 5DII's pixel density.

If such a lens is exist, then it's little (or zero) benefit to use 36 MP sensor over the 21 MP one.

So I think max resolution is a combination between sensor resolution and lens resolution.
The actual, aka, perceptual resolution is less than sensor resolution affected by many factors, sensor crop format, lens...larger sensor format, better lens, less loss in resolution.
Of course other factors could affect the resolution : camera shake, focus, diffraction, etc.
Belong to areas of better techniques.
Though 12 MP is already plenty for most application (or situation), for most people.
Yes for those Facebook and regular family photos.
I am using G1X (not the mark II) myself, and I believe its max resolution is less than 12 MP.
But I know that you are not in the most people category,

and that's a compliment, Peter.
Thanks. At this moment 12mp is not enough for me. 22mp is OK as I only have 2650x1440 resolution monitor at this moment, but 36mp is ideal when I own a 4K monitor as usually 50% of crop has the best displaying quality. When one day there is a 8K monitor, then even 36mp is not enough and want a 54mp then.
I know that you are stitching, I consider you are not satisfy with current camera's resolution can give you, at least not in one shot picture.
Not really for resolution but for UWA and pano purposes. There is no lens can record such wide angle near 180 degree with reasonable resolution and virtually without distortion. I have lots of pano photos to be processed in my recent central EU trip.
--
http://www.flickr.com/photos/55485085@N04/
http://qianp2k.zenfolio.com/
 
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