Problem solved: I inserted some aluminum foil from the kitchen between the lens and the 1.7x converter and now it does auto focus with every lens in my budget arsenal! From what I read here on pdml the 1.7x optics are excellent, will test it soon.
Toine On 4/6/06, Toine <[EMAIL PROTECTED]> wrote: > It won't focus with a Petri 2.8/35mm which also has a black anodized K > mount. I will definitely try my abrasive experiment on a old T-mount > adapter. If successful I plan to modify a Novoflex adapter. > Jens: maybe the adaptall adapter is also black (isolating anodized layer)? > > Toine > > On 4/6/06, Jostein <[EMAIL PROTECTED]> wrote: > > Alternative explanation: f/6.9 > > > > I think the AF needs at least f/5.6 (effective f/stop with converter > > attached) to work properly. > > > > Jostein > > > > ----- Original Message ----- > > From: "Jens Bladt" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Thursday, April 06, 2006 8:45 PM > > Subject: RE: 1.7x AF > > > > > > > Mine won't focus with a Tamron Adaptall 6.9 200-500mm !! > > > I guess it's never sharp enough?? Or is there any other explanation? > > > IOther than that I'm very impressed with this converter. I's > > > actually a > > > brilliant piece of equipment. > > > Regards > > > Jens > > > > > > Jens Bladt > > > http://www.jensbladt.dk > > > > > > -----Oprindelig meddelelse----- > > > Fra: Toine [mailto:[EMAIL PROTECTED] > > > Sendt: 6. april 2006 20:24 > > > Til: [email protected] > > > Emne: 1.7x AF > > > > > > > > > I noticed my 1.7x AF converter doesn't autofocus with T-mount > > > lenses. > > > It does autofocus with M-series lenses. The only difference I can > > > imagine is the K-mount on a M-series lens is electrical conductive > > > and > > > the T-mount is made of (isolating) anodized Aluminium. > > > I feel temped to use fine abrasive paper to remove the anodized > > > layer > > > on an old T-mount or short circuit two or more contact on the K > > > mount. > > > Would that make any difference? Maybe dangerous for the D body? > > > > > > Toine > > > > > > -- > > > No virus found in this incoming message. > > > Checked by AVG Free Edition. > > > Version: 7.1.385 / Virus Database: 268.3.5/303 - Release Date: > > > 04/06/2006 > > > > > > -- > > > No virus found in this outgoing message. > > > Checked by AVG Free Edition. > > > Version: 7.1.385 / Virus Database: 268.3.5/303 - Release Date: > > > 04/06/2006 > > > > > > > >
