Just a little confused... Am I picturing this right - you couple the mounting flanges together, leaving the 2 front elements as front and back? Is the focal length summed? One apperture used or both?
<scratching head> Mike Y ----- Original Message ----- From: "Dr E D F Williams" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, September 25, 2002 11:14 AM Subject: Re: OT:Homebrewing a LF lens > I have often coupled two 35mm lenses together. I get a coverage of somewhat > less than a third that given by one of them alone. > > D :-) > > Dr E D F Williams > > http://personal.inet.fi/cool/don.williams > Author's Web Site and Photo Gallery > Updated: March 30, 2002 > > > ----- Original Message ----- > From: "Anthony Farr" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Wednesday, September 25, 2002 11:09 AM > Subject: Re: OT:Homebrewing a LF lens > > > > Evan, > > > > A onetime work acquaintance of mine, at the Australian Museum, was Jim > > Frazier of Mantis Films, whose hobby was to tinker with dismantled lenses > > looking to discover the answer to some of his optical challenges. As it > > turns out he did find the answers, which are now closely guarded trade > > secrets, and went on to film many of the insect sequences in David > > Attenborough's "Life on Earth", to forge a unique joint venture with > > Panavision who manufacture and rent out his lens designs without actually > > knowing what the optical principle of them is, and to win an Oscar for his > > contribution to the motion picture industry. > > > > He once attempted to explain his lenses optical principle to me over a > beer, > > and I vaguely understood it at the time. How I wish I could remember it > > better now! > > > > And all this began because he tinkered with bits of lenses. Go for it! > > > > Regards, > > Anthony Farr > > > > ----- Original Message ----- > > From: "Evan Hanson" <[EMAIL PROTECTED]> > > > > > Well I'm getting pretty close on my homemade LF project so I'm starting > to > > > think about lenses. I could have sworn I heard once that you could > couple > > > two 35mm lenses together and get enough coverage for a 4x5. Has anyone > > ever > > > heard of this? If I could homebrew a LF lens out of a couple of k > mounts > > I > > > could contribute to PUG with a clear conscience. > > > > > > > > > Evan > > > Who is increasingly finding he has little use for the miniature format. > > > > > > > > > > >
