[Serkevan]

Interesting that the DA*60-250 was always designated as DA but the 200 and 300 were originally DFA. This is the first time I have seen this road map as well. It does shed some light on things.

There is also the DA 70-300 which I guess became the DA 55-300?

AFAIK it's because the 60-250 did not reach the intended 'star' level IQ on FF (corner degradation?). Of course, that's according to the criteria of Pentax engineers.

Also, to the OP: half the photos I took with the K-7 were from FF glass. Most of it, in fact, significantly older than myself. This is with a Pentax-M 50mm f/1.7.

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[aslyfox]

AFAIK it's because the 60-250 did not reach the intended 'star' level IQ on FF (corner degradation?). Of course, that's according to the criteria of Pentax engineers. . . .

To be designated as a Star-series product, a lens must demonstrate extremely high resolving power and contrast — from the center of the image field to the edges, even at open aperture — and exceptional optical performance with minimal distortion and color bleeding. In addition, it must be a very bright lens with one of the largest open apertures in its class. It must provide extreme strength, superior dustproof and weather-resistant performance, and outstanding operability. Only when all these requirements are satisfied, it is named a Star-series lens because it incorporates the very best of our state-of-the-art technologies that optimize the photographer's creative freedom. . . .

PENTAX STAR LENS | RICOH IMAGING