Originally posted by Glorfindelrb They communicated about having to redefine QC for the DFA* 70-200 to get it right and that delayed them. Everything might be ready to produce those qualitative lenses now. To take the 70-200 as a reference for delay is not pertinent but I suspect you to know it. They might be late again so, Pentax is not for impatients.
That is called engineering superficial talk; the real reason is much deeper that that.
Let Mr Sherlock Holmes from the Walkabout Creek explain this secret to PF members:
They had issues with design of the tripod collar on 70-200, because of their chosen design for the 70-200, which for granted will not work well on K5 and K3 camera designs. Why? Because of the hand grip on those cameras; fingers are stuck against the large barrel of the lens and after a while it hurts like a torture machine. The real reason? Lens motor and the aperture of the lens.
On the K1 things work better, because all is wider and bigger, and on the new KP it works perfect, because one can choose which grip to use. Even the L grip for the KP is designed to not curl your fingers inwards too much.
So I presume that the
new camera in the K3 series will be redesigned firstly to accommodate Pentax' 70-200 oddity. And the decision to release the KP with interchangeable grips, is not a 'novelty' or purely 'retro aesthetic' decision:
it concerns lens motors Pentax is aiming to deploy in future lenses, and it also
concerns the apertures chosen for new lenses. Therefore design of new cameras is made to keep the fingers away from lenses, as far as possible.
Vertical front dial on a smallish KP is a fine clue to this strategy, and I bet you missed it, dear Dr Watson. Typical horizontal dial pushes the index finger more toward the lens, but a vertical dial keeps it disciplined.
In theory, they should have copied Nikon's 70-200 approach, which leaves plenty of fingerspace, but of course, because of the motors Pentax decided to use, it was not possible. They did not wish to rebrand Tamron either, but wanted own design, and wished to avoid the SDM / USM like plague. DC is simpler and it works better. Lenses will require less updates with it, which is an unfortunate norm in Canon-Nikon-Tamron land, because of the motors they use — those lenses must be updated more frequently.
The result was therefore a 70-200 unlike all others.
One thing leads to another. Choosing a DC motor for the 70-200, and most likely for other
new Pentax lens designs, had an impact on all camera designs since. From the redesign of new cameras, it becomes visible Pentax is aiming for:
(1) lenses with wider apertures, and
(2) DC motors for own lens designs, both of which
(3) maximise on purchase value and
(4) reduce cost on updates and maintenance
Drawbacks? Less speed in more complex lens designs, so Pentax will always have by fraction
slower-to-get-things-into-focus lens motors. But they will have less problems and instead of re-issuing SDM/USM lenses every 3 or 4 years, they can spend time making more curious lenses.