On Thu, Feb 9, 2012 at 5:57 PM, Tom C <[email protected]> wrote: > Continuing the side discussion on the D800E... it does have a low pass > filter, but apparently not an anti-aliasing filter. The 800E low pass > filter, being ostensibly in lower demand, commands a higher cost. > > http://www.imaging-resource.com/PRODS/nikon-d800/nikon-d800A.HTM
Reading the description, it sounds to me like the two offsetting OLPFs are present to ensure the same amount of refractive material in the optical path. That allows them to make the 800 and 800E mechanically identical (i.e. the sensor in the same position). It's sort of like telephoto lenses with rear filters... if you don't want to use a particular filter, you need to have a clear filter in place because the lens is designed with its refractive properties in mind. "In this way, the light has the same optical path through the LPF/IR filter stack as in the standard camera, but the effects of the first LPF layer are undone by the second. If the characteristics of the two LPFs are exactly opposite each other, the net result is the same as if there were no LPF at all." -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
