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04-25-2008, 08:31 PM   #1
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SMC Pentax-M 50mm F2

Came across and old SMC M 50 F2 lens in my fathers collection. It fits my K10 but it does not activate (but instead flashes "F--") I like to think that I'm simply missing something in the setup as I'd like to give the lens a try. Is it possible?
thx

04-25-2008, 08:50 PM   #2
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I'm not familiar with the K10, but you will have to tell the camera what focal length lens you're using. You'll also have to activate the allow aperture ring thingy. Wherever that is on a K10.

Also, when you select an aperture for your shot, you'll need to hit the AE lock button to set the exposure before you shoot.
04-25-2008, 08:54 PM   #3
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check out this guide for the K100D,K100D (Super) Pictorial guide to using manual lenses [imgs] [Page 1]: Pentax SLR Talk Forum: Digital Photography Review should be similar for the K10D, but you press the Green Button instead of AE-L to meter
04-25-2008, 08:59 PM   #4
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Setting up K10D for M lenses

QuoteOriginally posted by beaumont Quote
Came across and old SMC M 50 F2 lens in my fathers collection. It fits my K10 but it does not activate (but instead flashes "F--") I like to think that I'm simply missing something in the setup as I'd like to give the lens a try. Is it possible?
thx
beaumont: As with any MF lens that does not have the "A" electronic aperture contacts, you need to enable the Aperture Ring.

Go to page 210 of your User Manual.

In [Custom Setting] set [Using Aperture Ring] to [Permitted].

Now when you are using a lens that does not have the "A" setting on the aperture ring (or for that matter when an "A" lens aperture is set manually) the camera electronics will permit the shutter to fire. You will have limited camera automation - it will behave much more like a manual body, and you will need to use stop-down metering.

In M Hyper-Manual mode once you have set the aperture on the lens, compose, check DoF with Optical Preview switch (AE metering is turned on), re-compose, manually focus until the hexagon lights and you hear a beep - then fire away.

You can also use the Green Button to turn on AE-L. Read pp. 148-158 of the manual.


Last edited by monochrome; 04-25-2008 at 11:16 PM.
04-25-2008, 09:13 PM   #5
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Thanks monochrome, good write-up. I'm beginning to feel like I shouldn't have posted, but it was 20 minutes since the original post there was no answer at all. I figured the OP would at least like to know his camera wasn't broken or sup'm.

Does the K10 handle flash with the M series lens, or will M mode & a flash chart be required?
04-25-2008, 09:22 PM   #6
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Man, you guys are good! I've just been sorting through some old boxes and have so far found three old lenses (including a Tele-Tokina) and an old Bellows Unit. I then come back to my post and wham!...immediate answers.
Thanks muchly, we'll give it a shot.
04-25-2008, 09:25 PM   #7
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Auto Flash?

QuoteOriginally posted by TourDeForce Quote
Thanks monochrome, good write-up. I'm beginning to feel like I shouldn't have posted, but it was 20 minutes since the original post there was no answer at all. I figured the OP would at least like to know his camera wasn't broken or sup'm.

Does the K10 handle flash with the M series lens, or will M mode & a flash chart be required?
Heh - we need a new Help post. I don't have a P-TTL flash yet, just a 285HV that I haven't tested the trigger voltage on, so I have only used the on-body flash so far. External flash stuff is on pp. 179.

We're hijacking his thread, though.

Last edited by monochrome; 04-25-2008 at 09:43 PM.
04-25-2008, 09:31 PM   #8
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M 50mm f/2

QuoteOriginally posted by beaumont Quote
Man, you guys are good! I've just been sorting through some old boxes and have so far found three old lenses (including a Tele-Tokina) and an old Bellows Unit. I then come back to my post and wham!...immediate answers.
Thanks muchly, we'll give it a shot.
Many here believe the M50/2 is a very nice walking around lens - sharp and good color saturation. Only thing it might lack is low-light indoor utility. I have two laying around that are on my For Sale list.

04-25-2008, 10:18 PM   #9
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Thanks all... she's up and working. (And thx for the link K100D.) We'll see how she operates in the daylight tomorrow.
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