- How do you drive the older lenses mechanical linkages?
just as you do in extension tubes
Which means that there would be no change from what we have now.
- More optics in the path means performance degradation.
what "more optics"?
See Bill Robb's post.
- Reduced room for an adequate mirror, etc with the "new K" standard
lenses.
sure, with smaller sensor size. is that a problem?
They've already reduced the size of the mirror in the D/DS. The size
reduction doesn't change the basic layout by much, certainly not by
10mm in mirror box dimensions.
basically, this is something that has already been done (zoerk
adapters
for mf lenses -> 35mm cameras).
Again, what's the point of it?
it also means that any "new K" lenses would be completely unusable on
the older Pentax bodies,
and they are not right now anyway (smaller image circle)
Not entirely true. You can use DA lenses on K mount bodies, assuming
that a 24x24mm image circle is enough to satisfy your needs. In some
cases, the DA lens might cover the full frame perfectly (DA40/2.8 is
like that), and Pentax' D-FA lenses are fully optimized for the
digital sensor while also being 100% compatible with 24x36mm format.
Basically the "through" adapter is like a K-mount teleconverter,
but without any optics.
Then it would do nothing other than add complexity to the lens line.
actually, no.
Once again, what would this do that hasn't been done already with the
current lens mount? It would create a new, incompatible line of
lenses, it would allow older lenses to be used but only with an
adapter. It would NOT change the field of view characteristics of the
older lenses on the digital sensor bodies at all, not without optics
to do that, and that would degrade the performance of the lenses that
you were trying to use as well as cost some speed.
Unless you can articulate exactly what benefit this might have, I see
no advantage to it whatever.
Godfrey
