Originally posted by fsge Then why not delivering this f4 first ?
Because a 70-200 f2.8, although not too many people actually buy one, is one of the most important lenses in a lineup too.
It (70-200 f2.8 in general, not about the one by Pentax in specific) is considered the affordable high end tele zoom for sports and portait and a lens many dream about getting in the future. Even ten years back it was a big deal in many discussions that it is missing from Pentax' lineup and people told others that this should be a reason to not buy a Pentax.
If the rumour is correct and the 70-200 f4 will be using the Tokina lens desing it is propably quite cheap in development compared to others too.
If it was about me personally Pentax should work on:
DFA* 35 /1.4
DFA* 24 /1.4
DFA* 16-50 /2.8
I am not too sure how good this would be from a economical standpoint though. The primes would propably not generate a lot of new customers.
I am not sure, how much about development costs is about doing the optical setup and how much the casing is. But maybe Pentax somewhere missed the point to modernize the limited lineup completly by using new af modules and weather sealing. Maybe they did not. Propably even Pentax doesnt know for sure.