08-08-2011, 02:04 PM
[quote name='Klaus' timestamp='1312809799' post='10503']
In theory such a "chart" could be custom-created by the semiconductor industry. We are talking about a mask equivalent to about 20x of the resolution of an image sensor ... just consider the costs for this. Assuming the pixel density of the upcoming NEX7/A77 sensor we would talk about a gigapixel charts printed on 36x24. In practice we would face all sorts of alignment and focusing problems. Not to mention centering issues. The margin of error would be extreme.
Regarding our findings - I think its viable to assume that they are at least valid till a max. magnification of 1:5 for a macro lens (with floating elements). That should be good enough anyway.
[/quote]
I have a target that outresolves my camera by a big margin at 1:1... focusing is indeed very porblematic, let along trying to determining what the results would be.
In theory such a "chart" could be custom-created by the semiconductor industry. We are talking about a mask equivalent to about 20x of the resolution of an image sensor ... just consider the costs for this. Assuming the pixel density of the upcoming NEX7/A77 sensor we would talk about a gigapixel charts printed on 36x24. In practice we would face all sorts of alignment and focusing problems. Not to mention centering issues. The margin of error would be extreme.
Regarding our findings - I think its viable to assume that they are at least valid till a max. magnification of 1:5 for a macro lens (with floating elements). That should be good enough anyway.
[/quote]
I have a target that outresolves my camera by a big margin at 1:1... focusing is indeed very porblematic, let along trying to determining what the results would be.