On 9/24/2012 2:47 PM, Bruce Walker wrote:
On Mon, Sep 24, 2012 at 2:37 PM, P. J. Alling
<webstertwenty...@gmail.com> wrote:
On 9/24/2012 1:54 PM, Darren Addy wrote:
On Mon, Sep 24, 2012 at 12:10 PM, P. J. Alling
<webstertwenty...@gmail.com> wrote:
Naa, that's nothing, KEH also has the /truely/ legendary A* 135mm f1.8 in
stock at this very moment. Look fast it won't last.
Almost $2K in bargain condition!
http://www.keh.com/camera/Pentax-Manual-Focus-Fixed-Focal-Length-Lenses/1/sku-PK06009016184N?r=FE
Related: Sure makes you wonder what this "new" 135mm f1.8 is/was (and
if it is for the digital age why it is still called an A* rather than
a DA*)
http://photorumors.com/2010/11/09/some-pentax-rumors-new-pentax-a-135mm-f1-8-lens-and-more/
Not new old, and most digital ready lenses aren't any different from their
old non digital counterparts, except maybe for more effective non reflective
coatings on the rear element.
Pentax literature points out how the final element of DA glass is
configured to direct the photons at right angles to the sensor to
compensate for the fact that the sensor is most sensitive to
perpendicular light. Film did not have this issue, hence FA glass (and
before) doesn't do this so the image will be fuzzier, especially off
center.
My understanding is that all DA glass has been created with this
astigmatism compensation specifically with sensors in mind.
I believe if you compare the 40mm f2.8 formulas there appear to be no
real differences between the old M lens and the new DA lenses. Most of
that is marketing hype. Some lenses with elements deeply recessed into
the body of a camera may require that kind of change but when you take
the registration distance required by the mirror box of a typical SLR or
DSLR the geometry was pretty much already there.
--
Don't lose heart, they might want to cut it out, and they'll want to avoid a
lengthly search.
--
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