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How many lenses could you mount on a 5DMkIII?

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jc88:
With rumours flying around about a 25mp+ 5DMkIII likely to see our stores next year, how many of the current lineup of Canon lenses have the resolving power to utilise such a large sensor?

Honestly I see this move to big sensors as an excuse for Canon to update their lenses and bully consumers into update their current equipment if they want to utilise a new FF system with proper AF. /2cents.

Grendel:
Pretty much any lens that came out during the last year or so and then some. I don't think that there will be a shortage of good lenses for a 25MP FF.

epsiloneri:

--- Quote from: jc88 on October 28, 2010, 09:00:08 PM ---With rumours flying around about a 25mp+ 5DMkIII likely to see our stores next year, how many of the current lineup of Canon lenses have the resolving power to utilise such a large sensor?

--- End quote ---

It's hard to know, because the way lenses are measured (at least at review sites) they use current generation Canons that would not sample the lens at that resolution in FF. For the central APS-C part you can compare to, say, 7D pixel densities (which are much higher than the current FF lineup). For the region in FF outside APS-C I don't know how you would know (unless the current lenses are already oversampled).


--- Quote from: jc88 on October 28, 2010, 09:00:08 PM ---Honestly I see this move to big sensors as an excuse for Canon to update their lenses and bully consumers into update their current equipment if they want to utilise a new FF system with proper AF. /2cents.

--- End quote ---

I see nothing wrong with that... if you really want/need the higher resolution you're welcome to, but it's not like they're forcing you. The lenses you have wont get worse.

jc88:

--- Quote from: epsiloneri on October 29, 2010, 05:14:17 AM ---

--- Quote from: jc88 on October 28, 2010, 09:00:08 PM ---Honestly I see this move to big sensors as an excuse for Canon to update their lenses and bully consumers into update their current equipment if they want to utilise a new FF system with proper AF. /2cents.

--- End quote ---

I see nothing wrong with that... if you really want/need the higher resolution you're welcome to, but it's not like they're forcing you. The lenses you have wont get worse.

--- End quote ---

You haven't considered the number of people who will upgrade from a 5DMkII for reasons other than a larger sensor, such as those moving away from the awful AF system.

Flake:
Not very long ago I posted a piece on the theoretical resolution of lenses, and it's not as simple as some might believe.  The actual maxima depends on the colour because of the wavelength of light.

Of greater importance is the resolution at the borders and the corners.  On the current 5D MkII lenses like the 17 - 40mm f/4 L have virtually no resolution in the corners wide open at 17mm.  When images are reduced in size the resolution across the image is reduced and the effect can be very noticeable.  On a camera with fewer MP (such as the D3) this effect is no where near as noticeable because the difference between the centres & the borders is less.  The solution would be a complete new lens mount with a larger image circle, or perhaps a different sensor shape, square perhaps, or even circular.  We are still being driven by the legacy of 35mm film Leica has broken the mould with the S2, but I somehow doubt that many Canon users would be pleased if their precious lens collections was suddenly obsolete.  (I wouldn't!)

As for replacement of lenses it's never going to be a perfect solution, no matter how good a lens is physics dictate that the corners will never be as good as the centre, the question each individual has to decide on is how good does it need to be for you to say it's good enough?

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