>From Kodak: "The DCS Pro 14n does not have an anti-aliasing filter. Consequently, the DCS Pro 14n yields images that are sharper than most other digital SLR cameras. The resolution of the Pro 14n is so high that aliasing artifacts are generally not an issue for most applications."
And "No, the sensor's much higher resolution reduces the need for an anti-alias filter because the high frequency of detail required to cause moire will seldom occur. Additionally we have some moire reduction built into DCS Photo Desk and the camera Firmware. Not having an anti-alias filter also delivers sharper images." >From dpreview: "Whenever you sample something digitally, you need to sample twice as fast as the highest frequency. This makes more sense in sound (the human ear can hear up to about 20K Hz so CDs are stored at 44K Hz) but also applies to sampling light on a CCD or CMOS sensor. If the resolution of your lens is higher than your sensor (and in most cases that is true) then you must blur the image a little before reading the data. If you don't you will get aliasing creating moire. Depending on the subject and type of moire, it can look quite ugly. There are two types. Color and luminance depending on the scene and subject material. The 1D, because of a weaker AA filter, will look sharper (because it blurs the image less) but is more prone to aliasing (moire). The Sigma SD-9 is not susceptible to color moire because it samples all three colors simultaneously at each location. It is, however, very susceptible to luminance moire because it has no AA filter. This lack of an AA filter is one of the things that gives the SD-9 and SD-10 their very crisp look." There is a lot of good info here if you dig through it - very interesting page! http://www.bythom.com/ccds.htm > -----Original Message----- > From: Rob Brigham [mailto:[EMAIL PROTECTED] > Sent: 06 July 2004 16:03 > To: [EMAIL PROTECTED] > Subject: RE: *istD anti-aliasing? > > > Isnt this the way they (DSLRs) all work? Except the full > frame Kodak jobbie which has no AA filter (and has problems > with moire etc as a result I believe). > > > -----Original Message----- > > From: Jostein [mailto:[EMAIL PROTECTED] > > Sent: 06 July 2004 15:54 > > To: [EMAIL PROTECTED] > > Subject: *istD anti-aliasing? > > > > > > Gang, > > > > After a chat with a pentax guy today, I got the impression > > that the *istD doesn't use much firmware antialiasing, but > > rely on a softening filter in front of the CCD to avoid > > jagged edges. Does anyone have any other info on this? > > > > > > Jostein > > > > > > > > > > > > ---------------------------------------------------------------- > > This message was sent using IMP, the Internet Messaging Program. > > > > > >
