Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
6 Likes  #1
Photos of K and M42 mount variations (photos of pentax k-mounts)
Posted By: Just1MoreDave, 01-20-2010, 02:01 PM

I'll be using similar terminology to this site, which has more technical details and less photos: Summary of the K-Mount Evolution, Names, and Features In these photos, I put the slot for the lens locking pin at the top, so they are all oriented the same. The aperture control lever is inside and slightly left. The red dot for installing the lens is behind the top of the lower left bayonet tab. At the bottom is the slot for the tab that communicates the aperture ring setting to the camera on "non-crippled" cameras. Pentax uses 5 screws, some other makers use 3 or 4.

The original K mount. This lens is the SMC Pentax 55mm f1.8. Pentax-M lenses are the same.

Name:  IMGQ6029.jpg
Views: 699
Size:  85.5 KB

The KA mount. This is the Pentax-A 50mm f1.4. Lenses with different maximum apertures will have a different pattern of contacts and insulators. KA lenses have a retractable pin in the middle of the contact pattern that tells the camera when the lens aperture ring is set to A. You can see the button for this setting protruding on the lower left.

Name:  IMGQ6030.jpg
Views: 841
Size:  81.1 KB

A non-Pentax lens with KA contacts and a pin for Ricoh program cameras. This lens is a Sigma 24mm f2.8. Note the different maximum aperture has different pins. The Ricoh pin is on the right side. See the next photos for why this is a problem.

Name:  IMGQ6031.jpg
Views: 782
Size:  109.3 KB

The KAF mount. This lens is the Pentax-F 50mm f1.7. Notice that the contacts all look the same now, and the A contact is switched within the lens, not mechanically retracted. Also notice the slot for screw-drive auto-focus, in approximately the same location as the Ricoh pin. On Pentax auto-focus cameras, some pin designa can drop into the slot where the screw drive is, locking the lens onto the camera.

Name:  IMGQ6032.jpg
Views: 670
Size:  89.4 KB

The KAF2 mount, just about identical to the KAF. This is the Pentax-FA 35mm f2.0.

Name:  IMGQ6033.jpg
Views: 617
Size:  115.0 KB

The KAF2 mount for a Power Zoom lens. This is the Pentax-FA 28-105mm f4-5.6 Power Zoom. Power Zoom contacts are on the light shield inside the mount rim, on the right side, just above and inside the screw-drive. These contacts are also used for SDM focus drive, although with different signals. There's room for a third contact here for future technology.

Name:  IMGQ6034.jpg
Views: 646
Size:  102.8 KB

The "crippled" KAF2 mount. This is the Pentax-DA 16-45mm f4. Lenses with no aperture ring have a fixed round pin in the slot at the bottom instead of a tab that follows the aperture ring. Contacts are the same as all the KAF lenses.

Name:  IMGQ6035.jpg
Views: 659
Size:  95.4 KB

The basic M42 screw mount. This is a Super-Takumar 85mm f1.9. It's old enough to have worn threads. The thread diameter is 42mm, thus M42. The chrome pin stops down the lens. A tab switch (upper right) changes the aperture operation from Auto to Manual.

Name:  IMGQ6025.jpg
Views: 637
Size:  83.9 KB

The variation for open-aperture metering on some later-model screw-mount cameras. This is the Super-Multi-Coated Takumar 150mm f4. A square protrusion indexes the lens. A tab in an arc tells the camera what the aperture ring setting is. A small pin on the left and half-hidden locks the Auto/Manual switch in Auto until the pin is depressed.

Name:  IMGQ6026.jpg
Views: 615
Size:  62.6 KB


Last edited by Adam; 01-15-2016 at 02:59 PM. Reason: re-uploaded pics
Views: 25,344
05-21-2010, 02:35 PM   #2
ocp
New Member
ocp's Avatar

Join Date: May 2010
Location: Georgia,US
Posts: 8
so many dusts
09-28-2010, 09:52 AM   #3
K-9
Veteran Member
K-9's Avatar

Join Date: May 2009
Location: USA
Photos: Albums
Posts: 1,966
The point is to see the mounts. I'm sure the dust can easily be blown or wiped with a brush.

Great info.
12-12-2010, 07:01 PM   #4
Inactive Account




Join Date: Dec 2010
Location: Sydney, Australia
Photos: Gallery | Albums
Posts: 107
Nice reference................

Thanks for taking the time to image all those mounts for us......

12-15-2010, 09:09 PM   #5
New Member




Join Date: Dec 2010
Location: Orange County, CA
Posts: 8
This is a great reference. I have spent a lot of time trying to figure out which lenses need adapters, which to watch out for that dreaded "Ricoh pin", etc. I will be back often as I get more into Pentax and start building my kit.
05-24-2011, 03:28 AM   #6
New Member
sbarath's Avatar

Join Date: Nov 2010
Location: Montego Bay
Photos: Gallery
Posts: 13
super comparisson thanks for the time spent this is a post i will be going back to many times over
02-28-2012, 07:54 PM   #7
Junior Member




Join Date: Jan 2012
Posts: 46
Dave,
Thanks for the great information.
As a novice, you'll have to go slow. I'd rather ask dumb questions, than make dumb mistakes.
I have some lenses that came with a P3n, that I would like to use on my K-x.
One is a Sears 70-210mm, f=1:4
Other is a Ricoh 50mm, f=1:1.7
Both have KA contacts and a Ricoh pin.
You caution against using such lenses on auto-focus cameras.
Are these lenses safe to use on my P-x?

Thanks,
Kurt
02-29-2012, 03:50 AM   #8
Pentaxian




Join Date: Dec 2011
Posts: 1,344
[deleted]


Last edited by beholder3; 08-12-2013 at 01:44 AM. Reason: [deleted]
02-29-2012, 07:42 PM   #9
Junior Member




Join Date: Jan 2012
Posts: 46
My Lenses, front and back and camera, not in intended order.
Not good pictures, but I am dealing with other issues.
The question concerns the pin at the 3 o'clock position (As shown in the photograph.)
If I understand correctly, this pin can fall into the screw drive of an auto-focus camera, making it difficult to remove
Is it safe for me to install these lenses on my P-x?
Attached Images
         
03-07-2012, 04:41 PM   #10
Pentaxian




Join Date: Mar 2010
Location: Frankfurt am Main
Posts: 1,094
QuoteQuote:
Is it safe for me to install these lenses on my P-x?
From what you wrote before, I assume you mean "K-x" ?

It is probably not save to try it. I never owned such a lens, but what I remember from threads in this forum and other sources, it seems there are two types of this pin. One is really sticking out (a "pin"), the other one is just like the tip of a ball head. From your pictures, I couldn't decide which they are. I heard the second mentioned version does not cause problems; but please don't rely on this information without doing a search for the original postings stating this fact. I just did a quick one, without success.

EDIT:
If you are sure you will never use a Ricoh SLR (from the film days), you may find a way to remove that pin. It is only used to enable Tv and full program mode with Ricoh SLRs. With most lenses, removing is possible, but the ways to do it varies vastly between different lenses. In this forum (and elsewhere by searching in the net) you can find many tips how to do it for special lens models, some even with pictures.

Last edited by RKKS08; 03-07-2012 at 04:51 PM.
11-29-2012, 06:26 PM   #11
Site Supporter




Join Date: Nov 2012
Location: Vancouver, BC
Photos: Gallery | Albums
Posts: 622
Thanks Dave for this compilation of information.
12-06-2012, 12:14 PM   #12
Junior Member




Join Date: Oct 2012
Posts: 28
A great, clear and very useful Thread. Thanks for taking the time and effort to do it, it's much appreciated.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
aperture, cameras, contacts, lens, lenses, mount, photos, pin, slot, tab
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Photos of lens mounts Just1MoreDave Pentax Lens Articles 14 01-06-2011 08:02 PM
Misc Assorted Autumn Photos from an Afternoon Stroll (8 photos) Rense Post Your Photos! 22 11-02-2010 02:37 PM
Concert Photos using Jupiter-21M 200/4 M42 fuseboxx Post Your Photos! 9 02-15-2010 05:20 AM
Travel 10 photos accepted in PPG (10 photos, larger post) tcom Post Your Photos! 22 01-22-2010 07:37 PM
Real Life Marina Photos (10 large photos) MightyMike Post Your Photos! 4 04-20-2009 08:22 AM



All times are GMT -7. The time now is 11:23 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top