[LRFlex] Re: APO vs Asph
- From: Doug Herr <telyt@xxxxxxxxxxxxx>
- To: <leicareflex@xxxxxxxxxxxxx>
- Date: Sun, 13 Feb 2005 14:03:52 -0800
on 2/13/05 10:33 AM, Charles Cason at cec@xxxxxxx wrote:
> Art: You seem to be the answer man for me today. If you were buying a
> 50 mm lens for you M camera, which would be preferable for general
> photography? APO or Asph?
> Which for the most detail? I have an R zoom lens that has an Aspherical
> element but it is not called an Aspherical lens. How many lenses to
> give it this designation? And finally, are there R lenses that are both?
> Thanks
> Charles
>
Charles,
The current 90mm Summicron uses both aspherical surfaces and high index/low
dispersion glass (a.k.a. ED, APO or LD depending on the mfgr). Lens
performance can be apochromatic, lens elements are not (despite the APO
label). It doesn't matter whether a lens does or does not use either of
these design features; what matters is the performance but when these
techniques make a spectacular lens the marketing folks are likely to make a
big deal of it.
To answer your question, as long as the performance is what you want the
technology used to create it is irrelevant. And, I know of no APO M 50mm
lenses.
Doug Herr
Birdman of Sacramento
http://www.wildlightphoto.com
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