M42 to K Mount Adapter for Pentax SLR and DSLR Cameras
WHAT ARE M42 LENSES ?
During the 1960's and 70's, a number of camera manufacturers used a screw-mount lens system, more popularly known as M42 screw mount.
These lenses were very popular, and in addition to the camera manufacturers, all 3rd party lens maunufacturers like Vivitar, Sigma and Tamron etc., produced a wide variety of M42 lenses.
The great thing about M42 lenses, is that they mostly came in primes and in a full range from 20mm right up to 1000mm, and in about any conceivable focal length in between. Primes always give the best results at that specific focal length, and are much better performers than the multi focal length lenses, like a 70-300, 24-70 etc.
Optical qualities were also superb, and they were quite sharp from corner to corner, and exhibited very little Chroma.
Obviously the pro's are great lenses and image quality at a fraction of the cost of a new prime. And then comes the choice: M42 primes are available in a wide range of focal lengths. For most DSLR users, with the conversion factors of 1.5, 1.6 or 1.7X, the modern prime range is very small
The con's are manual focus, but most photographers still prefer this. Even on the modern automatic lenses, manual focus just works better, and focussing is more precise.
Of course, all M42 lenses are 2nd hand, and one can pick up mint condition lenses at a fraction of the cost of a new prime. It is astonishing that some of these lenses still come in their original cases with front and rear lens caps!
Pentax owners can use these M42 screw mount lenses with your *iST D and K series (K100, K10, K200, K20 and K-m)digital SLR's but you will need the M42 to K mount adaptor that is listed here.
This adaptor is in mint condition, and in original packaging.
Note that this is an original Pentax item that is guaranteed to fit any M42 screw mount kens and any K mount Pentax SLR or DSLR body.
(This item is no longer available from Pentax and only 3rd party adaptors, some of dubious quality, are available.)
An M42 Screw mount lens fitted with an M42-K mount adaptor
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