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Forum: Pentax K-3 Photo Contest 07-02-2014, 05:18 PM  
natural repetition (K-3 contest Rd2)
Posted By Bondezire
Replies: 48
Views: 3,495
Trying to simulate natural bas-relief sculptures. From processing - just toning. Was photographing in the rain. Original color here :o

Forum: Post Your Photos! 03-26-2014, 10:47 AM  
Architecture Falling water...
Posted By dcmsox2004
Replies: 8
Views: 878
Forum: Post Your Photos! 01-18-2013, 02:54 PM  
Landscape Moonlit Forest
Posted By Nitrok
Replies: 39
Views: 3,320
This is from last night - cold but really nice night to photograph. :)

Forum: Pentax Lens Articles 08-12-2010, 04:24 AM  
Sticky: How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc)
Posted By Adam
Replies: 358
Views: 415,816
Many Pentax DSLR owners want to use M42 screwmount (Takumar) lenses, or M or K manual lenses, on their cameras because of the low cost and relatively high image quality of these lenses.


If you're wondering whether or not these lenses can be used with Pentax DSLRs (or the K-01), then the answer is yes! Pentax as well as third-party manual and screwmount lenses can easily be mounted on any Pentax DSLR (such as the K-1 series, KP, K-3 series, K-70, K-S2, K-S1, K-50, K-500, K-30, K-5 series, K-r, K-x, K-7, K10D, K100D, K200D, *ist D, etc.) Just follow this guide!



Modern Pentax DSLRs use the Pentax "K-mount", which employs a bayonet and therefore differs significantly from the M42 screw mount. The older manual M and K (SMC Pentax-M, SMC Pentax) lenses actually use the bayonet, so they will not need an adapter - you can skip straight to the lower portion of this article (starting at "Important!") for information on how to meter with those lenses. Screwmount lenses usually have "Takumar" in their names, and in order to mount screwmount lenses on your k-mount body, you'll need a Pentax k to m42 adapter. Pictured above is the genuine Pentax adapter, which is ideally the one you want to get. Similar third-party adapters are also available. Caution: Many third-party adapters, such as this one, have a protruding flange which will prevent you from focusing all the way to infinity. If you want to buy a third-party adapter (they're generally cheaper), make sure that they don't have this flange. Here's an example of a good third-party adapter.

Once you have your adapter, the next step is to install it on your camera (it can easily be put on and removed on-the-fly). Check out the m42 to k adapter manual.


After you've installed the adapter, you'll want to mount the lens. This is done by screwing it into the camera until the lens feels firmly attached. The focusing window and lens ring should line up with the camera just like any other lens. Now that your lens is mounted, let's talk about how to take photos with it.

Important! The hard part is to get the camera to actually fire when a manual lens is mounted. In order to accomplish this, enter your camera's custom function menu, select the "Using Aperture Ring" setting (usually at the end of the menu, #21 on the K-7, #27 on the K-5, #27 on the K-3, #26 on the K-1), and set it to 2 (allowed). Once you do this, the shutter will at least fire, as it wouldn't have with this setting disabled (you would simply have seen an F-- indication on the top LCD/info screen). The setting description should read: 'Shutter will release when aperture ring is not set to the "A" position' when "allowed" is selected. Also note that the mount on the lens must be conductive for electrical current so that it shorts the electrical contacts on the camera body. All Pentax manufactured lenses have a conductive mount, but some third party lenses do not in which case the area of the mount touching the contacts must be sanded down.

K-30, K-50, K-500, K-70, K-S1, K-S2 and K-01 users: make sure you also set your green button "action in M/TAv Mode" to Tv SHIFT. This is found under the button customization menu (page 3 of the main menu) on the K-01 or as a custom function on the K-30, K-50 and K-500. On the K-S2 and K-70, look under the e-dial programming sub-menu under button customization in the record menu.

Finally, ensure that auto ISO is disabled.

At startup, if your camera asks you for the focal length, enter the actual focal length as labeled on the lens. This will ensure optimal Shake Reduction performance. For zooms, you can use the lower end of the zoom range (this ensures that there will be no over-compensation), or the focal length that you shoot at most often.

Now, let's discuss metering. Since manual lenses don't feed aperture data to the camera, the only way for the camera to check how much light is being passed through the lens is to measure the light while the lens is stopped down. Follow this procedure to properly meter with a screwmount, M, or K lens:

___0. Ensure that the "Using Aperture Ring" custom function is set to "2 (allowed)" (K-30/50/500/01 users must also ensure that the green button is configured to Tv Shift in M/TAv Mode) as described above
  1. Set your camera to M mode using the mode dial (your camera won't fire in other modes*)

  2. Compose and focus your image.

  3. Using the aperture ring (the ring at the very back of your lens; it will have numbers such as 2.8, 4, 5.6, 8 written on it), select your desired aperture setting. Note that the smaller the aperture number is, the more light passes through the lens, and the blurrier the out of focus areas of your photograph will be (and vice-versa). Note your lens will not stop down until step 5.

  4. [Screwmount lenses only] Switch the diaphragm clutch on your lens to "Manual" (you can leave it on Auto when composing and focusing if you don't want a dark viewfinder).

  5. Measure the light by either pressing the "Green Button" (older bodies may use the Av button), or pushing your power button to DOF preview mode (only available on high-end bodies). Your camera will automatically set the shutter speed for you.

All that's left now is for you to press the shutter release button to take your photo. Congratulations- you've now learned how to use M42 and M & K manual lenses with Pentax DSLRs!

*Screwmount lenses may also be used in Av mode since they are always stopped down to the aperture you will be shooting at (unlike M&K lenses, which are stopped down only when the shutter is released or when you meter as described above).

Note: if your aperture ring has an "A" on it, instead of doing stop-down metering as per this guide, you'll want to set the ring to "A" and use the camera's scrollweel to adjust the aperture via Av mode.

Click here if you found this article helpful!

Video version:















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Forum: Pentax Lens Articles 01-20-2010, 02:01 PM  
Photos of K and M42 mount variations (photos of pentax k-mounts)
Posted By Just1MoreDave
Replies: 11
Views: 31,421
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.

Attachment 294914

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.

Attachment 294915

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.

Attachment 294916

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.

Attachment 294917

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

Attachment 294918

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.

Attachment 294919

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.

Attachment 294920

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.

Attachment 294921

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.

Attachment 294922
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