Re: Teleconverter F 1.7x AF: any comment?

[Herb Chong]

AF essentially stops working when the effective F-stop drops smaller than 
f5.6.

Herb...
----- Original Message ----- 
From: "Marco Ferrari" <[EMAIL PROTECTED]>
To: <pentax-discuss@pdml.net>
Sent: Wednesday, September 07, 2005 8:31 AM
Subject: Teleconverter F 1.7x AF: any comment?

I shot slide films, and I'm interested in converting a mirror lens and the
SMC-A 50/1.4 (both
manual focus) in a long telephoto and a 85/2.38 autofocus lenses.