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SMC Pentax-M f/2 50mm Manual Focus Lens for K Mount SLRs with Lens Caps

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For sale is a clean SMC Pentax-M f/2 50mm Manual Focus Lens for K Mount SLRs. This lens is accepted by any K mount camera body, 35mm or digital, but is fully manual in focusing and mechanical in auto indexing operations. The lens' aperture settings range from f/2-22 and it has a focusing range from infinity down to 0.45m (1.5 ft). The lens barrel is constructed out of metal, and has the feel of quality construction, weighing in at 6oz. The barrel of the lens has no major scratches or gouges, is ingraved with a depth of field calculation scale, and the lens accepts 49mm threaded accessories.

As for the condition of the glass, all elements are free from scratches, fungus or other permanent marring of the glass or coatings. There are a few specks of dust trapped inside the lens, but nothing that will cause image degradation.

As for the mechanics of the lens, the aperture ring clicks into its settings accurately and positively, the focus ring has a smooth and secure movement, and the aperture blades are oil free and spring closed quickly when manually tested. The lens also mounts smoothly and securely on a camera.

Included in the sale is a Pentax 51mm rubber slip on type lens cap and rear lens cap for K-mount lenses.

Frequently asked questions about Camerawerk

Cameras with manual control over shutter speed settings have their shutters tested by photo diode. A photo diode creates an electronic signal change that corresponds to a change in the intensity of light it is exposed to. Measuring the elapsed time between these signal changes with the photo diode placed at the film plane during test exposures gives accurate shutter speeds down to the millisecond. These speeds can then be compared to the speeds marked on the dial to determine how to compensate exposure. The only anomalies this type of testing doesn't detect are inconsistencies in speed between first and second curtains in focal plane shutters.
Cameras with shutter speed settings governed by internal meters are fired under different lighting conditions to audibly test for different shutter speeds. Audibly testing shutters catches any major anomalies in shutter operation, such as slow fast speeds or slower slow speeds. It does not guarantee accuracy or consistency of exposure like photo diode testing can.
Film testing means that film has been run through the camera (in most cases the camera has been one of my daily shooters) and samples can be provided to attest to the consistency of shutter curtain speed and light tightness.
I load used film packs with film frames that I have already exposed. Because the frames have already been exposed accuracy of the meter and shutter can not be guaranteed. Instead the shutter is audibly tested for different speeds. This test does allow me to check that the motors that drive the film development operate correctly and eject frames. It also allows me to check if built in flashes are operating correctly.
Stand alone meters and meters built into camera bodies are tested against my DSLR's light meter.
Most light seals have begun to degrade at this point. I visually inspect the seals, but without film testing no guarantee can be made to the light tightness of the camera body.

I can replace light seals in most camera bodies, but this will delay shipment for 5-7 business days and incur an additional $25 charge. However, light seal replacement is a fairly easy DIY job. You can find most materials at a local craft store or I can direct you to a well-respected seller who sells kits custom made for each camera model.
Flash Syncs
Film Advance
Self Timer Escapements
Film Counters
Auto Aperture Return in Lenses

If there is a test not listed in these FAQ's that you would like done, let me know and I will accommodate as best I can with the tools at my disposal.
I insure all items against loss or damage. This protects both you and I from the loss of a one-of-a-kind piece of vintage equipment. Contact me with pictures of the item if you believe any piece of an order has been damaged in transit. I will initiate the claims process to refund the order.
No 70% isopropyl alcohol and powdered graphite cocktail horror stories here. Bathing shutter assemblies in solvents typically just moves the grease and oil already in the shutter around, not solving the problem and potentially dissolving plastic parts within the shutter. To ensure a proper cleaning I disassemble shutters down to the aperture assemblies, individually degreasing each part with Ronsonol to ensure no residue is left behind on evaporation and no water is left behind to rust parts. After allowing the Ronsonol to evaporate, I reassemble, only relubing what's necessary. High friction engagements and dial set rings get white lithium grease and more delicate escapements and bearings get a drop of full synthetic 0W-20 oil.

SMC Pentax-M f/2 50mm Manual Focus Lens for K Mount SLRs with Lens Caps


Overview

  • Vintage item from the 1980s
  • Materials: metal, glass, plastic
  • Only ships within United States.
  • Feedback: 40 reviews
  • Favorited by: 12 people