8 > > How many stops is 256x? > > On Sat, Jul 3, 2010 at 12:57 PM, Brendan MacRae > <[email protected]> wrote: > > > > > > > > > > ----- Original Message ---- > >> From: Anthony Farr <[email protected]> > >> To: Pentax-Discuss Mail List <[email protected]> > >> Sent: Sat, July 3, 2010 3:58:31 AM > >> Subject: Re: Strange "Asahi NC Takumar 3,3/300mm Pentax M42" on Ebay > >> > >> "The mounting the tube seems also an original." > > > > Are you sure about > >> that? Compare the pictures at > >> AOHC: > > > > http://www.aohc.it/cameras/nocta.jpg > > and, > > http://www.aohc.it/images/sp40.jpg > > > > to > >> the picture at the > >> auction: > > > > > http://i.ebayimg.com/11/!Bw0VCdQBGk~$(KGrHqIOKioEwPgB+i)hBMKt40,WIw~~_1 > 2.JPG > > > > You > >> can see that the historic pictures show a much shorter tube > > between the wide > >> part of the lens and the body of the image > > intensifier, with no obvious > >> tapering or visible bright metal. The > > ebay lens doesn't have any place > >> where an image intensifier could be > > placed according to the old > >> pictures. > > > > regards, Anthony > > > > The Nocta is described pretty well in Oosten's "The Ultimate Asahi > Pentax Screw Mount Guide 1952-1977," pgs 255-256. From the three > pictures in this book, it appears as though the eBay lens is complete > minus the larger focusing handle. A rare unit indeed. > > > > The description of lens from the book: > > > > "The lens is a highly specialized Takumar 1:3.3/300mm for Infrared > photography. The minimum aperture is f/22, the angle of view is 8 > degrees. It was supplied with a 256X Neutral Density filter (42mm) for > use under daylight conditions. The actual front of the lens measures > 300/3.3 = 91mm in diameter of which only the central part is used in > daylight." - pg 255. > > > > -Brendan > > > > > > > > > > -- > > 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. > > > > > > -- > Aloha Photographer Photoblog > http://alohaphotog.blogspot.com/ > > -- > 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.
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