Originally posted by bdery Not going to happen according to a Pentax rep I talked to. Japan headquarters engineers tested it and it didn't meet their standards for a STAR lens on FF. I tend to disagree, as I've shown in my review of the DFA 70-210 (when comparing to the 60-250) but that's the company's opinion.
Originally posted by normhead Ya, I read that.
Sometimes what they say makes no sense.
I suspect having built the 70-210 with faster motor, that's the way of the future.
Keep in mind that the DFA 70-210, while I guess not optically superior to the DA* 60-250, is not a "star" lens. RIcoh has set very high standards there, and also "star" lenses are not based on 3rd party designs. The "star" for this range is the DFA* 70-200/2.8. So IMO what Ricoh said makes sense, and implies they feel the 60-250 is curently a "consumer grade" zoom, which is what the new 70-210/4 is.
I think what it really came down to for Pentax is it was simply easier to rejigger the Tamron 70-210 than it would have been to take the 60-250 and revise it cosmetically, fit a new motor (would that require an adjustment to the optical design?) and, well, revise the optics anyway because they needed the lens to do much better than the 60-250's 1:7 maximum magnification ratio.
The fact that Pentax implemented a Focus Range Limiter on the 70-210/4 provides insight into their thinking.