Archived posting to the Leica Users Group, 2000/02/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]"A.H.SCHMIDT" wrote: > > At the time, when the Pentax Spotmatic was released, Pentax advertised a Ghostless > UV filter. > > This filter did not have a flat ground glass, but it was curved. A similar curve > like the front element of a lens. Pentax in their leaflet says: "The Ashai > Pentax Ghostless Filter is a breakthrough in filter design. With this curved UV > filter, the image light reflected back to the Ghostless filter and retransmitted > through the lens, forms a duplicate image in the air, thus eliminating a ghost > image on the film plane." ><Snip> Would not introducing a curve into a filter make it act like a lens? I'm surprised it did not change the "power" of the lens!! Mark Rabiner