Sue Pearce wrote:
> Perhaps a little too sarcastic, but the small sensor camera zooms get to
> minimum aperture way too soon to be all that useful in anything other than
> sunlight without taxing the IS.
>
Willie Wonka wrote:
> I like everything about it Moose, but one thing...
>
> Power zoom and this is a dealbreaker to me.
You can't get the form factor, size and weight needed without a zoom
that collapses into the body. If you do that, you can't have a
mechanical zoom or a zoom that's fast at the long end.
The limiting factor on speed is the diameter of the front element. To go
from 140mm-e f4.5 to f2.8, for example, requires an increase in diameter
from 31 to 50 mm. That increases the area by 2.6 times. As that also
increases the thickness of the thick parts of the element, the increase
in weight is probably over 5x. And that applies to all the elements in
the front part, at least.
Hold a ruler in front of your G10. Indeed, the FE looks to be about
31mm, with a whole front assembly diameter of 43 mm. I expect the
smallest for f2.8 would be about 65 mm.
How you gonna fit that in a small body? What about the stronger parts
and motor to support and operate it?
I can imagine a collapsing zoom with a control ring right at the front
of the body, which is engaged when the zoom extends. BUT - current
designs have at least two barrels and the outer one doesn't fully extend
in WA positions. If you observe it, the zoom action is pretty complex.
So, a complete zoom redesign with complex added mechanical linkages.
Hmmm ... How much bigger, heavier and more costly will that be?
The things you want just aren't gonna happen in a P&S form factor with
collapsing zoom. I've already got (D)SLRs and lots of lenses, including
fast primes. What I was looking for was the least compromise in IQ in a
P&S form factor with articulated screen and comprehensive controls.
Moose
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