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07-27-2013, 09:07 PM   #1
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old lens and K10

Hi

I have recently acquired a K10 and would like to be able to use my pre digital lenses. For example my Asahi SMC Pentax M 1.2 50mm. I put it on the camera and set the focal length. How do I then control exposure. I guess it should be on Manual. Am I ( or the camera) able to control the shutter speed and the aperture somehow?

Cheers,

07-27-2013, 09:09 PM   #2
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A text & video guide is available here:
https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-meter...k-x-k-7-a.html

Adam
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07-28-2013, 10:33 AM   #3
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The camera manual is your friend (free download from pentaximaging.com), though the information it provides for vintage lens use is a bit spotty.

The link Adam provided is a great resource and is where we generally refer noobs so they can get started with their older glass.

Beyond that, here are few bullet points:
  • There is a setting in the "Custom Setting" menu called "Using Aperture Ring". That should be set to "Permitted".
  • Manual mode (M) is used with K-mount lenses lacking the "A" contacts. As you might imagine, it is the same as a manual exposure film camera. You set the aperture using the ring on the lens and the shutter speed using the front control dial on the camera.
  • Metering is a complicated matter. In theory, you can use green button (stop-down) metering and indeed this will give you settings that are based on the camera's program line for the amount of light striking the meter's sensors. Unfortunately, those settings are often off by as much as 2-3 stops. The reasons are complicated, but the short solution* is to use those settings as a start point. Use the preview image in the rear LCD along with the image histogram as hints to get the correct exposure. Alternatives include using a hand-held meter or estimating using "Sunny-16" rule.
I know this sound cumbersome, but it is not really too much trouble. I do the majority of my K10D shooting with vintage lenses and have been generally happy with the experience and the results.


Steve

*Unfortunately, there is no long solution either with the K10D. This issue exists for other brands (e.g. Nikon) and is related to mathematical corrections dialed into the metering system. Recent model Pentax dSLRs (K-7 and newer) do a much better job.
07-29-2013, 08:39 PM   #4
kittyshen2013
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This is a really good read for me, Must admit that you are one of the best bloggers I ever saw.Thanks for posting this informative article.

07-30-2013, 08:46 AM   #5
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You will also want to record RAW files, you can adjust them in post-processing far more than jpeg. Using RAW it's preferable to underexpose a bit more than overexpose. The sensor records a lot of data in dark areas, but this isn't true for overexposed "blown" areas.

Also, if you don't have a lens hood for the old lens, get one of those rubber collapsible ones, it makes a HUGE difference.

I'll also say the Magic Lantern guide for the K10 was a huge help to me as a beginner, but it doesn't do a lot for showing how to use the older fully manual lenses. The ability to operate in fully manual mode was an attractor to Pentax for me.
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