I was thinking these days something like conspiracy theory
.
We all know that Pentax have many lenses made by/with/... Tokina and Tamron. But do we know about all of them?
I have started to think about it and looking for information.
My guesses are:
Pentax 35 2.8 Macro Limited - it could be
Tokina 35 2.8 Macro Pentax 18-135WR - it could be modified
Tamron 18-250 with some lens elements removed. I'm thinking about this tamron because it has the same shape, same front element, absolutely identical optical quality from 18mm to 50mm, after that the tamron is way better. We know that Pentax 18-250 is actually Tamron, not officially but I think it is almost 100%. Now Pentax announced that the new Pentax 18-270 is Tamron officially...
Pentax 17-70 4.0 - could it be
Sigma 17-70 2.8-4.0 or more likely the optically identical older one
17-70 2.8-4.5 version? I think it could, it looks like it, the only difference is the opposite ring rotation. The sharpness and distortions are the same, the flares(something typical for sigma) are huge problem with the pentax 17-70 which is not typical for SMC coatings...
Pentax DFA 100 2.8 -
Tokina 100 2.8 macro? If we look back the FA 100 2.8 is much better lens than the DFA successor, so is it possible the later model to be taken from other company?
So anybody else with guesses, I'm serious. For example DA 35 2.4 - it is the same as FA 35 2.0, but DA 50 1.8? Who made the DA 50 1.8?
PS Is Pentax a lens manufacturer or it isn't from a big period of time?