On Nov 4, 2010, at 14:03, Subash wrote:

> hi,
> 
> anybody have experience with this lens? pretty heavy, a little over
> 1.5kg, but i saw one today for sale, it's in almost mint condition and
> so badly needs a caring home :) the one i saw today is the one on this
> page:
> 
> http://www.pentaxforums.com/lensreviews/Takumar-300mm-F4-1962.html
> 
> i guess what i really want to know is that once mounted with an m42
> adapter, does one use this like a K/M lens with stop-down
> metering/green button? would appreciate any input you may have...
> 

It will be different.  The aperture does not get held open, so if you're 
dialing the lens down to f/11 you'll be looking through a lens which is 
actually stopped down to f/11.

On the bright (ha!) side, metering in Av mode would be real-time with no need 
for the green button.

 -Charles

--
Charles Robinson - charl...@visi.com
Minneapolis, MN
http://charles.robinsontwins.org
http://www.facebook.com/charles.robinson


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