However, as I indicated in the article, I did apply a *lot* more sharpening to the 1Ds3 file in the raw converter than either the 5D or 1Ds2: ACR amount 50/Detail 50 as opposed to 30/25 for the 5D and 35/30 for the 1Ds2. That is the reason I infer the 1Ds3 has a stronger AA filter. Note however, I am only theorizing it has a stronger AA filter due to the additional capture sharpening required and I don't know that for a fact...
I see! I'm no expert on sharpening routines and those lengthy tomes on the subject, by Bruce Frazer and others, are not high on my list of reading priorities. However, is it not a fact that larger files generally either require
more sharpening or can take
more sharpening before they begin to look unnatural and over-sharpened?
I recall one of your own sharpening routines is to interpolate a file to a larger size, apply a greater degree of sharpening than you would normally at the smaller size and then downsample the image to its original size using 'bicubic sharper'.
That the 1Ds3 image should require greater sharpening to bring out the additional fine detail it is able to capture does not seem odd to me, or indicative of a stronger AA filter, but what one would expect when using the same lens that was used on the other cameras.
It has to be the case that every time we get an increase in pixel count, the additional pixels are capturing softer detail, less contrasty detail, if we are using the same lenses.
If, for example, the cut-off point for resolution with the 1Ds2 is 50 lp/mm and the cut-off point for the 1Ds3 is 60 lp/mm (let's not quibble about the precise numbers), we can't expect detail at 60 lp/mm (on the 1Ds3) to have the same contrast as detail at 50 lp/mm on the 1Ds2. This point should be obvious to anyone who understands MTF charts.
The reason I mention this is because already, as a result of your suggestion that maybe the AA filter on the 1Ds3 is even stronger than that on the 1Ds2, we have comments from readers on this forum that they have suddenly lost interest in the 1Ds3 and will cancel their order, or not place an order.
You've put the wind up some folks, Jack .