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10-28-2007, 01:13 PM   #1
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SMC on a K10D? What limitations?

SMC on a K10D? What limitations?

Manual focus; ok

Setup apeture mode to allow non-a-setting???

IS there auto aperture or manual? any other restricitons???

If it if K-mount it definitely fits right? when were these SMC lenses produced about? 1980s?

Thanks

10-28-2007, 01:50 PM   #2
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Your question is somewhat vague. SMC refers to the anti flare coating on the front/rear lens elemnts. It can apply to lens of today or from 30 years ago.

If you mean an M42 screwmount then with the correct adapter then it can be used in M (manual mode) only once the 'Allow Aperture Ring" is set to "allow" in the menu. . Same for the K and M series lenses. You will have to set the aperture you want and hit the green button for the correct shutter speed.

A series and the AF variants can be used in all modes.
10-28-2007, 01:56 PM   #3
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Older lenses have the following restrictions:

Screw Mount lenses do not have any apature function through the body. yoou have to focus wide open (brightest image) then stop down with the apature ring to the desired setting. Camera, if in the Av mode will meter correctly. or use green button in manual mode.

K Mount lenses in Av mode will only shoot wide open (some have suggested if you don't lock them tight or drill a second locking point in the mount so the apature does not engage, they can work as screw mount in Av mode)

K mount in M mode can do full apature focusing and stop down to shoot. Metering is done by pressing the green button.

There is no P-TTL with either screw mount or K mount, You need KA mount or newer for P-TTL flash
10-28-2007, 02:27 PM   #4
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The Pentax k10D will take any of the older lens. For the very old screw mounts you need an adapter. Some of the older lens remain as manual focus. The aperture and shutter controls on the k10d are unprecidented to any of the cameras in its price range and has some unique combination such as the the shutter and aperture priority and lets you set either one and then adjusts the sensitivity. There is a front and back dials that help to control these and the custom menus give these dials some different controls.

10-28-2007, 02:50 PM   #5
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QuoteOriginally posted by rdrum76 Quote
SMC on a K10D? What limitations?
Manual focus; ok
Setup apeture mode to allow non-a-setting???
IS there auto aperture or manual? any other restricitons???
If it if K-mount it definitely fits right? when were these SMC lenses produced about? 1980s?
SMC = Super Multi Coating, it is the anti-flare treatment for the optical lens elements.
But am I correct in assuming that you refer to the lenses known as SMC Pentax <focal length>?
Like the SMC Pentax 28 f/3.5, SMC Pentax 50 f/1.4 and so on?
Well, those lenses are actually the first generation for the Pentax K-mount, called K-serie lenses.
(but the 'K' is not written on the lens). Full name is "Ashai Optical SMC Pentax 50 1:1.4" and so on. Ashai Optical = the company name. Pentax = brand name. 1:<aperture>.
Ok... those lenses are manual focus, mechanical only. You can't set aperture on the body, so you use aperture on the lens. You press the "green" button in M)anual exposure mode to get an exposure reading and setting the shutter speed. Centrumweighted and spot metering works, multisegment metering not. No P-TTL flash.
10-28-2007, 05:58 PM   #6
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You might find my page about the lens series useful, rdrum: Pentax Lenses Explained

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10-28-2007, 06:09 PM   #7
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Thanks to all

Definitely one of the perks of having a Pentax
10-28-2007, 06:11 PM   #8
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QuoteOriginally posted by Lowell Goudge Quote
Older lenses have the following restrictions:

K Mount lenses in Av mode will only shoot wide open
Perhaps more accurate to say at the specified aperture value set manually on the lens.

10-28-2007, 06:14 PM   #9
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Adam, that's a good page. You should have that as a link on the lens review data base for all to find.
10-28-2007, 06:17 PM   #10
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QuoteOriginally posted by creampuff Quote
Perhaps more accurate to say at the specified aperture value set manually on the lens.
Actually, the pentax cameras will not releaase the apature activating mechanism at all in AV mode, for K mount lenses.

Regardless of the apature set on the lens, the camera will always take the shot wide open, but it does meter correctly on the full apature, and adjust the shutter speed.

The only way to have a K mount lens stop down is manual mode.,
10-28-2007, 06:55 PM   #11
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Lowell Goudge Sorry misread what you wrote. Yes you're correct, in Av mode the lens won't stop down to the set aperture.
10-29-2007, 05:03 AM   #12
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Copied from the chart:

M and K lenses work on all cameras except the MZ/ZX-30, MZ/ZX-50 and MZ/ZX-6. [...] They work with stop-down metering on the *ist D series and K series digital SLRs provided that a custom function is set appropriately.

Custom function for stop-down metering???

I am going to play around to see how to do it.

Last edited by rdrum76; 10-29-2007 at 05:09 AM.
10-29-2007, 05:17 AM   #13
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QuoteOriginally posted by rdrum76 Quote
Custom function for stop-down metering???
Well, not really for stop-down metering but for allowing the use of the aperture ring on the lenses. When you have set this custom function to allow the use of the aperture ring, then you can stop-down to the set aperture so the camera can measure the opening and setting a shutter value, this happens when you press the green button in Manual mode.
10-29-2007, 08:00 AM   #14
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got it; that makes more sense

now if a get a lens that does have an "A" setting on the lens; leave it on "A" and you have auto aperture; do you need to go into the menu to now take off the "permitted use of aperture ring"?; i geussing probably not; since I switched between the 18-55 with no problem

I wonder why they even force you to permit use on the aperture ring if it only helps and does not hurt?

Thanks again
10-29-2007, 08:14 AM   #15
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Nope, just leave that setting alone and you can use every compatible lens no matter what the type (IE: Da, F, FA, A, M, M42 etc). No idea why that setting is there and the camera was set to Permitted on all from the factory.
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