02-19-2012, 11:18 PM
[quote name='wim' timestamp='1329686292' post='15926']
Because at higher resolution sensors, the system resolution comes into play more, amongst others. This is no longer obfuscated by the AA-filter, which just cuts off real resolution at a specific point anymore.
When you check the different reviews, you will likely find that this happens probably around 12-14 MP for APS-C, and 16-18 MP for FF.
Furthermore, with twice the number of pixels, one only gets a maximum increase in resolution of about 40% (square root of two, - 1 of course) at most, as MPs increase with area, two-dimensional IOW, and resolution is expressed as a linear, 1-dimensional parameter. However, that si just the sensor. System resolution still is the inverse of (the inverse of lens resolution plus the inverse of sensor resolution) by formula.
Essentially, MTFs start looking more like MTFs obtained with film with higher resolution sensors, be it at about twice the resolution obtained with (colour negative) film.
Kind regards, Wim
[/quote]
Yes, thanks Wim, I understand your logic.
What we see, however is that in moving from 10MP to 16MP the centre performance improves but the edges/corners do not. It's not a small difference. It's not like moving from DX to FX as there is no physical effect from sensor size and a deterioration in the telecentric efficiency of the lens. It does in fact LOOK like a comparison of DX and FX! ? ? ?
Because at higher resolution sensors, the system resolution comes into play more, amongst others. This is no longer obfuscated by the AA-filter, which just cuts off real resolution at a specific point anymore.
When you check the different reviews, you will likely find that this happens probably around 12-14 MP for APS-C, and 16-18 MP for FF.
Furthermore, with twice the number of pixels, one only gets a maximum increase in resolution of about 40% (square root of two, - 1 of course) at most, as MPs increase with area, two-dimensional IOW, and resolution is expressed as a linear, 1-dimensional parameter. However, that si just the sensor. System resolution still is the inverse of (the inverse of lens resolution plus the inverse of sensor resolution) by formula.
Essentially, MTFs start looking more like MTFs obtained with film with higher resolution sensors, be it at about twice the resolution obtained with (colour negative) film.
Kind regards, Wim
[/quote]
Yes, thanks Wim, I understand your logic.
What we see, however is that in moving from 10MP to 16MP the centre performance improves but the edges/corners do not. It's not a small difference. It's not like moving from DX to FX as there is no physical effect from sensor size and a deterioration in the telecentric efficiency of the lens. It does in fact LOOK like a comparison of DX and FX! ? ? ?