The infamous FA 28-70mm f4.0 had a composite aspheric element made up of
a glass component with an optically matched molded plastic. It was the
break down of this element that supposedly rendered a number of those
lenses into, (very lightweight), paperweights.
On 1/6/2014 10:11 AM, Bruce Walker wrote:
That's a good question, Boris. Not being a gearhead I don't closely
study the fine details of lens construction, but I assumed that only
glass was hard and stable enough to be ground or milled into shape
with the required tolerances.
Does anyone know if plastic, or anything besides glass and coatings is
used in the optical path of any K mount lenses?
On Mon, Jan 6, 2014 at 12:12 AM, Boris Liberman <bori...@gmail.com> wrote:
Point taken. However I don't believe that all modern Pentax lenses are
devoid of optical plastic. Nor do I think that all the lenses that Pentax
marks as having aspherics is made by crafty glass processing techniques,
especially the inexpensive ones...
On 1/4/2014 9:46 PM, Bruce Walker wrote:
Excellent! Let me know when your balsa wood jetliner is ready for its
maiden voyage and I shall be there with my K-3 to document it.
On Sat, Jan 4, 2014 at 2:34 PM, Boris Liberman <bori...@gmail.com> wrote:
Bruce, let me suggest to you ever so humbly that the precision of
execution
has nothing to with material used...
On 1/4/2014 9:30 PM, Bruce Walker wrote:
On Sat, Jan 4, 2014 at 2:22 PM, Aahz Maruch <a...@pobox.com> wrote:
On Sat, Jan 04, 2014, Boris Liberman wrote:
My point is that miniaturization is reaching yet another level. And
this camera unlike iPhone's and plethora of Android devices is
seriously real deal.
Yes and no -- real glass requires real weight and bulk. I agree that
most people (who don't care about DOF, macro, or large prints) will
stick with phone cameras. No surprise, really.
Not to mention: sharpness, contrast, colour, and all the other quite
significant qualities that precision glass has over plastic lenses.
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