how to Using Old Pentax Lenses On Dslr

Using Old Pentax Lenses On Dslr

You may use those lenses, of course. The latest autofocus lenses will be more practical than these. Nevertheless, Pentax DSLRs are special in that they may be used with any Pentax mount lens that has been produced, including medium format lenses and screw mounts (with adapters.)

Any K-mount lens can be used with any Pentax DSLR, as this covers metering, IS, focus confirmation, autofocusing (if applicable), and autofocusing. Since the K and M series (database), which are the earliest series, lack aperture contacts, they are incompatible with AV and TV modes.

  • You will need to utilize M mode in its place, but you will still get meter readings.
  • When the +/- or green button is pressed, it also proposes a shutter speed, depending on the settings and camera model.
  • These digital SLRs’ metering tends to be less constant than on the film SLRs they intended for.
  • These two series only receive centre-weighted and spot metering instead of matrix metering; however, focus-trap is used.
  • The “KR” mount is a special variety of the K-mount that Ricoh used.
  • If the excess pin is not removed, it will become stuck.

Additionally, you can purchase an M42-PK adapter and utilize the countless low-cost screw-mount lenses offered on eBay, in pawn stores, etc. They can use Av mode since they can stop down with the aperture ring, and have focusing verification, IS, and centre/spot metering.

Which more recent Pentax cameras can use the older K-mount lenses?

Pentax camera

With a K-mount, except for Pentax medium format cameras like the 645 series, this includes nearly every Pentax interchangeable-lens camera produced since the mid-70s. 

The Pentax Q line of compact mirrorless cameras.  As a result, the K-1, K-3, K-P, and K-70 are all currently in demand. The K-5, K-30, K-50, K-500, K-S1, K-S2, and K-01 mirrorless cameras are also relatively new.

There are a few warnings:

  • Automatic exposure metering is impossible with K-mount lenses that lack electronic pins transmitting aperture information.
  • The “SMC Pentax” and “Pentax-M” lenses from Pentax’s two earliest generations, as well as numerous older third-party lenses.
  • When using certain lenses, you’ll need to set up the camera to manually meter by pressing a button.
  • Some older K-mount lenses from third parties have physical variations that interfere with the operation of modern Pentax cameras.

The most obvious example is early Ricoh lenses, which contain a settings pin where the autofocus drive screw is located on current Pentax cameras. It may become stuck if you mount one of these lenses without tapping down the pin.

Can I use my old Pentax 645 SLR Lenses with Pentax DSLR cameras?

Yes, you can. The best thing to have is a bayonet to M42 screw-fit adaptor. The main issue is that it will not operate in Auto or Program mode because a modern camera cannot identify an outdated manual lens. There won’t be any issues if you are familiar with using manual mode on your DSLR.

Suppose you know that 645 lenses are medium format (film) and that your Pentax DSLR sensor is half the size of a full-frame 35mm (film) sensor or the new full-frame sensor. In that case, you will get the greatest results from your 645 lenses if you use a fotodiox adapter that enables lens shifting for multiple images captures, resulting in the full 645 images “circle.”

In an image stitching program, such as Image Compositor (Microsoft Research, free), or other editing software, multiple images are combined into a single image with 645 perspectives ( angle of view and focal length), along with the number of photos multiplied by your megapixels.

➔ For Example

Four 20-megapixel frames can produce an 80-megapixel image depending on the amount of overlap. Recognize that this method works best for landscapes and anything that still allows for good image matching for the stitching process. The use of TRIPOD is required for this concept.

How to Use Old Pentax Lenses On Dslr

Pentax Lens

It’s really simple to mount the Pantex lens and adapter on the DSLR Canon camera. Let me demonstrate.

❖ Step 1

The first step is removing and removing this EOS lens from the camera. As you can see, both the lens and the adapter have red dots. We’ll align the two, then turn in a clockwise direction. You can see that it is now securely in place.

❖ Step 2

Now that we have located the red dots on the adapter and the camera, we can align them and lock them into position by rotating them clockwise. We currently have this contemporary DSLR camera with the vintage Pentax K lens.

❖ Step 3

The lens is equally as easy to remove:

  • The camera’s lens release button will be the first thing you need to find.
  • You must push that down before removing the lens and adapter by rotating them counterclockwise.
  • The adaptor is tougher to remove.
  • We need to exactly locate this tab within the adapter by the red dot.
  • After pushing it in, we will flip the adapter counterclockwise and pull it off.
  • You’re all set.

This is a fantastic camera and lens set, and Pentax K lenses are affordable and simple to locate. You may purchase a large number of them for a very low cost. You can locate them in thrift shops and online.

Related: Can You Use Analog Lenses For Digital Cameras?

Why are Pentax cameras considered to be the best?

Pentax DSLR cameras often have the best viewfinders and are quite durable, giving many nice features above their price range. There are also many affordable Pentax legacy lenses available. On the other side, they frequently feature less attractive designs, slower or less effective focusing, and less developed devices overall.

Choosing a new DSLR that meets your demands can take time and effort when you’re in the market for one. Here are 5 explanations as to why Pentax cameras are the best option for you:

★ Wide Range of Lens Selections

A wide selection of lenses is one of the qualities you search for in a DSLR so that your collection and photography can develop. As of June 2013, Pentax has the widest range of lenses available for APS-C sensor devices. Additionally, full-size and APS-C-compatible lenses can be heavy and expensive. Pentax has developed a wide variety of lenses with unifocal and zoom qualities to suit your demands by focusing on lenses for a particular sensor.

★ Interchangeable, lightweight, and portable lenses

One of the most portable and lightest brands of lenses is Pentax. Pentax accomplished this by locating the shake-reduction mechanism inside the camera instead of the lens. Pentax has further decreased the weight and size of these lenses by adapting their design to work with APS-C image sensors.

★ Heavy-Duty Construction

Pentax DSLRs are made for shooting in any condition and environment, from the harsh desert and rainforest to vacation photos by the pool. You may snap photos with confidence no matter what the weather throws at you due to their dust- and moisture-resistant bodies and lenses.

★ Compatible With All Interchangeable Pentax Lenses

Pentax cameras decrease the damaging effects of camera shake with any attached compatible lens, even in low light or while using a telephoto lens, by integrating Shake Reduction within the body of all DSLR cameras.

★ More than 100 Color Variations

The Pentax K-500 and K-50 DSLRs come in more than 100 color choices, allowing you to match the body and grip your favourite hues to personalize the camera further. You may customize your camera to make it stand out in a sea of DSLRs in black or white.

Do old Pentax lenses fit on new cameras?


Yes, all Pentax DSLRs are compatible with K-mount lenses. This covers metering, IS, focus confirmation, autofocusing (if applicable), and autofocusing. Since the M and K series (database), which are the two earliest series, lack aperture contacts, they are incompatible with AV and TV modes.

  • Pentax’s current lineup of DSLR cameras and MILCs, which have been around for a while, mostly utilize the K mount (since 1975).
  • Many earlier Pentax/Takumar lenses will be for the M42 mount since Pentax previously used it.
  • The K mount has seen a few changes since it was first introduced, but its mechanical design has not changed.

Any K-mount lens may be mounted on any K-mount body because the main differences are in focusing mechanisms and how the camera body communicates with the lens. However, not all camera features may work.

How to set up a modern Pentax DSLR for vintage K-mount lenses?

Make the Pentax DSLR compatible with vintage K-mount lenses by setting it in this way.

❖ Set the focal length after inserting the lens.

Due to mechanical compatibility among all Pentax mounts, attach the lens to the camera body as usual. The lens’s focal length must be inserted before the camera can operate.

  • I will insert 50mm in this instance because I am using a Pentax-A 50mm f/1.4 lens.
  • Other than the photo metadata, it doesn’t impact the camera.
  • The camera won’t then be able to detect the lens aperture; you’ll observe.

The camera can’t even shoot if it can’t figure out the correct aperture in its factory-installed setting. This issue needs to be resolved by making the following configuration changes.

more details: 55mm vs 50mm lens

❖ The user aperture ring should be changed.

Click the left button once while holding the menu button (the one with the flashes icon). The last page of the camera configuration is the one you are on now.

Then, using the directional keys, choose “Using Aperture Ring” and click “Ok.” Select “2 Enable” from the Menu now, and click “Ok.” We’re done when you press Menu to end the setup.

Frequently Asked Question

Are all Pentax lenses compatible with Pentax cameras?

SDM lenses work with all current generation Pentax Digital SLR bodies. However, several older Pentax digital SLRs, including the K110D, the original K100D, and previous models, are incompatible with the DA* 55mm, DA 17-70mm, and DA 18-135mm lenses (If it has the most recent firmware, the K100D Super is compatible).

Can Pentax lenses compete with Nikon’s? 

When the APS-C crop factor is considered, the focal lengths of these two high-quality, sharp lenses are fairly similar (Nikon = 85mm, Pentax = 82.5mm) and their maximum apertures. The colour quality of the Pentax K-3 was substantially superior to the Nikon D600 in almost every shot.

Are all Pentax lenses compatible?

Yes, all Pentax DSLRs do support K-mount lenses.

Which digital cameras use Pentax K mount?

The HD Pentax DA 560mm f/5.6 ED AW HD super-telephoto lens has a 35mm-equivalent 859mm focal length and is the other new Pentax K-mount lens. An AF drive motor built into the lens’s barrel makes for smoother autofocus.

Which mount does the Pentax K1000 use?

The K bayonet mount was first used with the K Series and is included on the K1000. It originally came with the inexpensive SMC Pentax 50 mm f/2 lens, although it may use any K-mount manual focus lens today. This applies to all SMC Pentax models, including the SMC Pentax-M and SMC Pentax-A.

Are Pentax lenses good?

Some superb Pentax lenses go well with their top-notch construction and feature-packed bodies. Compared to brands like Nikon, Canon, Sony, and even Fujifilm, Pentax consumers have fewer lens options.

All Pentax SLR lenses are interchangeable?

Yes. All Pentax K-mount lenses, including K, M, A, F, FA, D-FA, and DA lenses, can be used without an adapter and with a functional light meter.

What kinds of lenses work with Pentax?

Pentax Digital SLR Cameras Tamron AF 70-300mm f/4.0-5.6 Di LD Macro Zoom Lens (Model A17P)

● Pentax and Samsung digital SLR cameras are compatible with the Tamron AF 70-200mm f/2.8 Di LD IF Macro Lens (Model A001P)

● Tamron Digital SLR Camera Lens for Pentax AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) Cameras (Model A09P)


This has helped you understand more about Pentax lenses and manual K-mount lenses for current DSLRs. These lenses are fantastic, and there are several of them available. In the comments section below, please ask any questions you may have.

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