On Oct 28, 2012, at 3:26 PM, William Robb wrote: > On 28/10/2012 1:50 PM, Larry Colen wrote: >> >> On Oct 28, 2012, at 12:48 PM, David Parsons wrote: >> >>> So, you'd have sensor based IS trying to keep the sensor stable during >>> an exposure, and at the same time, moving the sensor to introduce AA? >>> >>> What does 'mechanical AA do that the optical method doesn't do? What >>> would be the advantage of it? >> >> The advantage is that most of the time you leave it off. But, if you have >> something like the K5-IIs, without optical AA, and you are photographing >> something with a pattern, like fabric, you could turn it on. >> >> And I'd implement it as an either/or with image stabilization, not a both at >> the same time. > > Seems to me if the sensor moves in relation to the projected image during the > exposure, you are going to just get a blurred image. This isn't quite what an > AA filter does.
I thought that what an AA filter did was specifically to blur the image on the order of a pixel width so that no transition was narrower than a pixel. I.e. acting as a low pass filter to ensure that there are no patterns of a higher frequency than the sampling rate. The trick would be to only blur the image on the order of a pixel. > -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
