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11-28-2009, 08:28 PM   #1
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SMC Takumar M42 2.5/135 lens on K10D

I have the above lens together with a M42 Pentax adapter for my K10D.
This lens has a moveable slide on the lens body (MAN/AUTO) what setting should this be on to take a shot, how, when & why is this function used.
What is the correct sequence for taking shots
Camera settings & technique steps:
1. MF = On, Mode = M, Focus subject, Set F-stop, set exposure speed value, (shutter release halfcocked) shoot,
2. MF = On, Mode = Av, Focus subject, Set F-stop, exposure speed value autoset by camera, (shutter release halfcocked) shoot,
Both of these techniques appear to work OK giving similar results whether the lens diaphram clutch slide is in the MAN or AUTO position.
What other modes/techniques/settings can I use. ?
On the K10D can/do I use the AV-L or green button for setting exposure settings ?
How,when and why do i need to change the Man/Auto lens setting.,or is it safe to always set on MAN for the K10D for EV and f-stop adjustments, and taking the shot ?
TIA

11-28-2009, 08:57 PM   #2
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The camera does not interface with that lens in the way the "auto" setting requires: the lens will stay wide open if set to auto. In manual, the aperture will close down to the f-stop to which you set the lens as you set it. The viewfinder will grow darker, depth of field will increase.

As for exposure method, 1 or 2 will work. I find when using Av mode I often need to set my exposure compensation to +0.5 to 1.5, but your camera may vary - this is based on looking at the histogram on the results. Good luck!
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