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Steve Perry wrote:
Let's say lens "B" has hit its limit and now "A" is out resolving it. Lens "A" will eventually hit a limit also, and the difference is the percentage between the two in sharpness. I don't think that percentage changes depending on the sensor - the sensor can't make a lens any sharper than it already is.
Sure, I see what you're saying. The lens' actual resolution doesn't change because of the sensor behind it.
I think the OP's question was more of a practical one, though - that is, could there be a change in apparent sharpness difference between two lenses by changing the sensor resolution. I think the answer is yes - there are some situations where that would be possible, namely if one lens is being resolution limited by the sensor and the other one is not.
If lens "A" resolves 100 l/mm, "B" resolves 200 l/mm, on a 24mp sensor that resolves 90 l/mm, they will appear very similar (these are made up numbers but not completely out of whack). On a 54mp sensor that resolves 150 l/mm, the difference should be much more noticeable though.
In some ways it might seem a trivial distinction but I think we're at a point now that the sensor resolutions are high enough where some lens designs are actually hitting that limit, and some lens designs are not.
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