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
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