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10-14-2010, 08:10 PM   #1
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Quick question

I know this has been discussed many times but I'm not sure if they're talking about just digital cameras or not. If a genuine Pentax screw mount adopter is used on an MX is metering done in normal fashion? Thanks=

Mark

10-14-2010, 10:41 PM   #2
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No, you will be doing stop down metering, not open aperture metering.
10-15-2010, 12:52 PM   #3
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As wheatfield said, no. However, the MX should meter properly with pre-A K mount lenses, which the digital bodies can only handle via stop-down.
10-15-2010, 06:56 PM   #4
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Original Poster
Let's say I've screwed an S-M-C Takumar lens to my MX or ME Super what exactly would I do? I know the Taks that I've looked at have a manual/auto lever on the front. I assume this comes in to play.

Mark

10-15-2010, 07:12 PM   #5
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Note the camera meters correctly only when the switch on the lens is at "manual" and the aperture ring of the lens is set at the aperture value you want. Cameras with bayonet mount do not control the switch on the screwmount lens.

You can change the switch to "auto" (lens will be at full aperture regardless of the aperture setting) for ease of focusing (bright viewfinder).

Before hitting the shutter release, you have to manually set the switch on the lens to "manual" and the aperture ring of the lens is set at the aperture value you want.

(Sorry for the repetitive-ness. I'm not sure how to make it clear).

Last edited by SOldBear; 10-15-2010 at 07:19 PM.
10-15-2010, 07:33 PM   #6
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What those other guys said. There is nothing special about the MX. The flow is essentially the same as for stop-down metering on a Spotmatic and K-mount bodies except that you have to manually stop down the lens using the A/M switch. It goes like this:
  1. Choose your desired shutter speed
  2. With the lens stopped down (A/M switch in M position), meter the subject using the aperture ring to select the appropriate f/stop
  3. Move the A/M switch back to the A position
  4. Frame and focus
  5. Move the A/M switch back to the M position
  6. Release the shutter
  7. Repeat steps 3-6 until you change subjects, change shutter speeds, or the light changes

Steve

Last edited by stevebrot; 10-15-2010 at 07:39 PM.
10-15-2010, 07:37 PM   #7
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Thanks. This is all new to me. I think I'll rule out Takumar lenses.

Mark
10-15-2010, 07:48 PM   #8
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QuoteOriginally posted by Mark R Quote
Thanks. This is all new to me. I think I'll rule out Takumar lenses.

Mark
That's a shame. Once you use them for about 30 seconds you will discover how simple it is. Especially on a camera with a light meter and matched needle metering like the MX

10-16-2010, 06:30 PM   #9
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Thanks again. I'm sure I could get used to it but at this point I'm simply looking to upgrade my old F2 50mm and the Takumar was certainly one of my choices. I think I'll end up with either a SMC K 55 1.8 or the much recommended 1.7. I will almost certainly end up with a Takumar at some point if for no other reason than to enjoy the build quality of the early lenses. Thanks again.



Mark

Last edited by Mark R; 10-16-2010 at 06:36 PM.
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