Archived posting to the Leica Users Group, 2004/10/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 04:29 PM 9/30/2004, Adam Bridge wrote: >I thought there wasn't going to be a low pass filter in the digital R? >Has that changed? Did I miss it? You cannot use high resolution lenses on a digital sensor without a low pass filter. The Nyquist problem is a fact of nature. You cannot sample a 10MHz signal with a 2MHz clock. Artifacts galore if you try. The missing info cannot be completely added (interpolated) later. The gaps are too large. They may claim that no low pass filter is used, but you can bet your boots that some sort of mechanism is used to reduce the lens resolution to more match the resolution of the sensor. It's a fact of physics. Miss matched frequencies must somehow be matched. JB