Originally posted by jay Why change something if it's not broken? Sticking six metal contacts a lens in different patterns to identify the max aperture of a lens seems like a perfectly decent idea -- especially since it maintains forward and backward compatibility with existing lenses. And it's a lot more rugged than a serial digital interface.
And, it's not keeping them from designing this mystical lens. Recall -- as I said earlier -- there are two UNUSED patterns. So if they introduced a 30/1.0 lens, they'd be able to implement it in the K-7; and I'm guessing older cameras could be updated with new firmware to support it.
And they wouldn't have to change the electro-mechanical spec.
And, everyone knows I'm a fan of APS-C + fast glass vs. full-frame + traditional glass.
So, here's hoping for some new designs!
from the D on (in my mind) it would have taken only a few bytes to code the min/max/ in the on lens chip. only a few lines of code to query the chip, check for the data, and use it. If no data, check contacts, if not there, full manual. Piece of cake.
Yes you could still have contacts for "old" cameras" but the current cameras could easily do without it.
what your missing in what I said is that it could be a fall back of sorts. 2 ways of doing the same thing..
Problem was under powered digital communications.
The D has the ability to get the f stop of max MTF off the lens. Some of the other digital models do as well.. oddly some don't....
Pentax used (and still may do) to plan things 2 generations ahead...
There is more than it seems in those lens chips but for some reason it is not exploited as of yet fully it SEEMS... I may be wrong.
I usually like the way they do things but some stuff just seems odd...
Most of my criticism is just my inability to fathom what they were thinking.
BTW: As noted, the table is limited and even during the super program days, you needed workarounds w/ some lenses (notably TC's and Tamron Adaptall II's)
It was a good, though not perfect, system at the time but it really has outlived it's usefulness... It is going to be harder and harder for Pentax to compete AND keep the backward compatibility thing. I believe they realize this as well...