I'd love to see a gallery of photos you took using av mode/m42s so I can see 
for myself how accurate the metering is.  When I do it that way I get a lot of 
junk.

Sent from my phone.

On Nov 5, 2010, at 10:46 PM, "J.C. O'Connell" <hifis...@gate.net> wrote:

> 
> av mode will work on pentax DSLRS
> using M42 lenses because the metering
> is based on actual light reaching
> sensor, so if you shoot a shot at F4,
> it will give a specific shutter speed,
> but if you stop down, less light reaches
> sensor and slower correct shutter speed
> will occur.
> 
> --
> J.C. O'Connell (mailto:hifis...@gate.net)
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> 
> -----Original Message-----
> From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of Sam
> L
> Sent: Friday, November 05, 2010 10:01 AM
> To: Pentax-Discuss Mail List
> Subject: Re: m42 takumar 300/4
> 
> 
>> On Thu, Nov 4, 2010 at 3:10 PM, Charles Robinson <charl...@visi.com> 
>> wrote:  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, forgive me for asking, but do you actually use m42 lenses on a
> recent pentax dslr?
> 
> I ask because I think it is a little misleading to say that metering in Av
> mode is "automatic".  Let me immediately state that I'm a nOOb at both dslrs
> and m42s.  But my experience is that when working with pentax dslrs and m42
> lenses:
> - Av mode will work correctly ONLY if your aperture is wide open.  if you
> want to stop down the lens, then the metering gets helplessly inaccurate.
> - Manual mode:  the meter works reliably but requires one extra push of your
> metering or green button.  (focus, set your aperture on the lens such that
> the blades actually visibly stop down, press the green button, fire away).
> 
> I'm not trying to be a jerk but trying to get a better understanding for
> myself as well as others.  Everyone feel free to enlighten me!
> 
> Thanks,
> ---------------------------
> Sam
> 
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