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01-27-2007, 04:25 PM   #1
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Mounting screwmount lenses on K100

Well I am now the more or less permanent owner of a free (always the best kind) Takumar 200/f4 screwmount lens. So now that I have the thing how do I mount it on my K100D?

01-27-2007, 04:42 PM   #2
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you'll need one of these

eBay: Pentax ScrewMount M42 Lens to K Mount Camera Adapter (item 120080157764 end time Feb-02-07 19:50:47 PST)
02-01-2007, 10:42 PM   #3
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*bump*
I don't want to make another thread about the same thing but is there some kind of FAQ about what features are available with screw-mount lenses on the k10?

I know there's the whole manual focus thing, which i like and i'm accustomed too since I've only owned slow consumer lenses with slow AF's. BUT, I don't know about the whole controlling the aperture thru the lens instead of the camera thing. What's that all about? Does it apply to all screwmount/m42 lenses or just some? This is what i've read at least.

I'm really confused about what I can and cannot do because i'm itchin' to get my hands on a nice smc takumar prime.

p.s. genuine pentax adapters are o/s at the official site, any place else that sells the genuine ones?

Last edited by skydragoness; 02-01-2007 at 10:57 PM.
02-01-2007, 11:01 PM   #4
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You need to be in manual mode.
You need to set the custom setting that permits camera operation when the aperture is set to other then 'A'.
You should set the green buttion in Tav & M to shift shutter.

Aim, Focus; (*)set aperture with ring, press green button to set proper shutter speed, (repeat from * to 'set' desired DoF), fire!

02-02-2007, 08:52 AM   #5
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What does the (*) stand for? Sorry.
02-02-2007, 09:21 AM   #6
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Placemarker; as in repeat from this step or repeat from step 3. You don't have any automation in Manual mode/manual focus. You must pick an aperture with the ring on the lens and the green button will set the appropriate shutter speed.

There are many aperture/shutter speed combinations that give an equivalent exposure. A wide aperture (small number like 1.2, 1.4, 2, 2.8) will give a very shallow depth of field especially when the subject is close. But you can use a faster shutter speed.

A small aperture (large numbers 11, 16, 22) gives a very deep depth of field, even with the subject close. But they require a very slow shutter speed.

Unlike a program mode which has a bias for speed or for depth of field or for best lens performance, in manual mode all those decisions are made by the photographer.

Restating:
1) Aim,
2) Focus;
(3*)set aperture with ring,
4) press green button to set proper shutter speed, (repeat from "3*" to 'set' desired DoF),
5) Fire!

Clear as mud, right?
02-02-2007, 02:37 PM   #7
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green button, on k100?
02-02-2007, 02:44 PM   #8
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Is that an actual pentax model? Or is that the same as the others where you lose, what is it, an f-stop and infinity focus?

02-02-2007, 04:04 PM   #9
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QuoteOriginally posted by dave sz Quote
Is that an actual pentax model? Or is that the same as the others where you lose, what is it, an f-stop and infinity focus?
That is not an official Pentax model, but it is capable of infinity focus. The ones with the wide flange restrict infinity focus, this one is fine.
It will probably work just fine - I have two off-brand and four Pentax brand adapters and have no problems with any of them.
02-02-2007, 04:08 PM   #10
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Not for M42 Lenses!

QuoteOriginally posted by jfdavis58 Quote
You need to be in manual mode.
You need to set the custom setting that permits camera operation when the aperture is set to other then 'A'.
You should set the green buttion in Tav & M to shift shutter.

Aim, Focus; (*)set aperture with ring, press green button to set proper shutter speed, (repeat from * to 'set' desired DoF), fire!
These instructions are for manual bayonet lenses. For M42 lenses you can shoot in aperture priority mode. Just be sure that the lens is stopping down (for the Takumars, set them to 'Man' instead of 'Auto').
  1. Allow manual focus lenses in custom menu.
  2. Set the camera to Av mode on the mode dial.
  3. Point at subject.
  4. Shoot!

Your instructions, of course, will work for M42 lenses - but the steps are unnecessary.
02-02-2007, 04:24 PM   #11
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QuoteOriginally posted by dave sz Quote
green button, on k100?
It's the AEL button on a K100D that turns on the metering in "M" mode.

You might also need to go into the Custom Menu and set
FI with S Lens used --> 2

It's not clear to me if the second menu change is needed. I done it tho.
AE-L bttn on M expsr --> 2

---------------------------------------------------------------------------------

I have tried M42/K100D in Av mode, but in dark ambients it underexposes. M mode seems to work.
02-02-2007, 09:05 PM   #12
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QuoteOriginally posted by carpents Quote
These instructions are for manual bayonet lenses. For M42 lenses you can shoot in aperture priority mode. Just be sure that the lens is stopping down (for the Takumars, set them to 'Man' instead of 'Auto').
  1. Allow manual focus lenses in custom menu.
  2. Set the camera to Av mode on the mode dial.
  3. Point at subject.
  4. Shoot!

Your instructions, of course, will work for M42 lenses - but the steps are unnecessary.


Aaaaaa!

Thanks guys. That's much clearer now.
02-02-2007, 11:10 PM   #13
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Wow, this is getting complicated, especially since when I closely inspected the lens I discovered that it is missing it's rear element and aperture......good thing it was a freebie.
02-02-2007, 11:47 PM   #14
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So, it's broke? I can lend you some duct tape and a couple of paperclips.
02-03-2007, 05:11 PM   #15
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QuoteOriginally posted by jfdavis58 Quote
So, it's broke? I can lend you some duct tape and a couple of paperclips.
Hmm, I could McGuyver aperture blades witht he duct tape and use the paperclips to improvise a screw mount adapter...I see potential. Now all I need is some silly putty.......
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