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11-02-2015, 04:21 PM   #1
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Using Aperture Ring

I have a mix of Pentax lenses, including some with aperture rings and an "A" setting and those with aperture rings that are fully manual, i.e. no "A" setting. On the latter you need to set the menu item "Using Aperture Ring" to "enable." What I'm wondering is if it makes any difference to leave that set that way (enabled, or "2") all the time? I generally leave my lenses on A if they have that, and sometimes would forget to turn that setting back to 1. But as far as I can tell it doesn't matter...or does it?

11-02-2015, 04:28 PM   #2
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It does not matter. It is better to leave it enabled so there is not a problem when you use your manual glass. Auto focus lenses are not affected by this option being enabled.
11-02-2015, 04:29 PM   #3
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leave it on enable.........I do it on k-r and k-50 no problems
11-02-2015, 04:42 PM   #4
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On my K-5 II and now on the K-S2 I leave it "on" all the time. No problems.

11-02-2015, 04:50 PM   #5
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Using a K-500 and noticed no problems with leaving it on
11-02-2015, 05:18 PM - 1 Like   #6
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I think the *real* explanation for that setting is:

"Allow exposure when no lens detected."

As far as the camera body is concerned, Pentax-M = no lens due to no electrical contacts on the M's. Same for bellows or a reversed lens.
11-02-2015, 06:35 PM   #7
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QuoteOriginally posted by Jinnax Quote
I think the *real* explanation for that setting is:

"Allow exposure when no lens detected."

As far as the camera body is concerned, Pentax-M = no lens due to no electrical contacts on the M's. Same for bellows or a reversed lens.
Ding! Ding! Ding! We have a winner!


Steve
11-02-2015, 06:40 PM   #8
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QuoteOriginally posted by Jinnax Quote
I think the *real* explanation for that setting is:

"Allow exposure when no lens detected."

As far as the camera body is concerned, Pentax-M = no lens due to no electrical contacts on the M's. Same for bellows or a reversed lens.
Well, not exactly given how different models handle painted/coated rear lens mounts vs bare metal lens mounts. My K10D doesn't care - the green button in manual mode will actuated the stop-down lever. I believe on the K30/K50 the green button will not actuate unless at least the data pin is shorted out.

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