Pentax K20D DSLR

Pentax lens compatibility

Pentax is the only company currently offering full compatibility with all the lenses they ever made.

One of the reasons I bought a Pentax DSLR is because Pentax is the only company currently offering full compatibility with all the lenses they ever made.

The older, screw-mount lenses need a 15$ adapter to be used with their bayonet mount. Each lens retains the capabilities it had when first sold. A manual focus lens will not suddenly autofocus.

Pentax active autofocus system

When manually focusing a lens, the autofocus system on Pentax DSLRs is still active and will tell you when accurate focus is achieved. In other words, your hand is the focus motor but the camera still confirms focus.

At the press of a button, the metering system of the camera is also active even when using a manual lens.

Pentax users can use the millions of legacy lenses without issues, although using a manual lens is slower than using a fast autofocus lens. But those older lenses can be purchased very cheaply and are often high-quality optics with great build quality. Some old lenses are actual legends, still avidly sought after by users willing to sacrifice autofocus in exchange for high quality.

I personally own four manual lenses, two of which are still very well regarded today, the other two being comparable to entry-level lenses.

About the author

Bernard Dery

Bernard was born and still lives in Quebec City, Canada. A doctorate candidate in Physics, Bernard works full-time as an optical designer at EXFO, a world leader in telecom tests and measurements tools. His professional interests go from fiber optics to atmospheric data collection and lasers.

His first contact with photography was a Vivitar fixed lens camera that he had purchased at age eight. His interest developed slowly, and for many years Bernard limited himself to family and travel pictures.

Bernard discovered the world of digital photography in February 2004, when he purchased his first digital camera. Developing an interest for composition, he experimented with many subjects: landscapes, nature, cities and architecture.

soon began to invest more time and energy into his new found hobby, finding new and beautiful subjects to capture everyday. His challenge is to capture the mood and emotion carried by a scene as it presents itself to him.

A trip to Italy in
September 2004 fueled his growing interest with numerous magical photography opportunities.

Bernard and his wife like to spend free time near a lake at his family's summer house, where he finds new subjects to capture every day. His interests are varied and include hiking, camping, swimming, boating and reading, as well as most winter

Bernard, known as bdery on forums, uses a Pentax K20D and W80, Canon S2 and a Nikon SQ as a backup.

Thumbnails are of photos by Bernard Dery - used with permission
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