Re: Does AR Coating Improve Vision?

On Jul 29, 12:48 pm, Salmon Egg <salmon...@xxxxxxxxxxxxx> wrote:
On 7/29/07 9:46 AM, in article PeudnYt30JnRWTHbnZ2dnUVZ_gedn...@xxxxxxxxxxx,



"Mark A" <nob...@xxxxxxxxxxx> wrote:
"Salmon Egg" <salmon...@xxxxxxxxxxxxx> wrote in message
news:C2D19190.8D8B9%salmonegg@xxxxxxxxxxxxxxxx
The benefit from AR coatings is going to be greatest when YOU ARE in
strong
ambient light looking at a dim object. That is when the signal-to-noise
ratio is going to be smallest. When the SNR is large, all kinds of
nonlinear
optical processing performed by the eye and brain. Think of having bright
lights on a street also populated with runners wearing black.

Bill

You did not read my post correctly. I said standing in a dark room and
looking into a room that is well lit (lighted). Because the lenses are in a
dark room they not much affected by reflections. Because one is looking at
an object in the distance in a well lighted room, one should be able to see
quite well.

What I am described is sort of like using a lens shade on a camera to
minimize reelections hitting the lens.

I know how to read, but will admit to having left out of the penultimate
sentence quoted by you.

I responded to your post because you were "standing in a darkened room." If
that is why you need glasses and cre only about information transfer rather
than being offended by stray light, forget the coatings.

Bill
--
Support the troops. Impeach Bush. Oh, I forgot about Cheney.

Interesting experiment.....which I have tried. At first I had
difficulty preventing reflections because even a well lit object
viewed from a darked environment will create some reflection. I found
that standing in a moderately darkened area and looking at a
moderately lit object did the trick. And I've concluded that viewing
an object straight on, the Rodenstock offers a slightly clearer
image. Still the Rodenstock doesn't offer the peripheral vision that
the Ovation does. I tend to think though if the optics were equal I
should have the same sharpness regardless of the design of the lens
since I'm viewing straight on. Right now I'm leaning toward ditching
the Ovation all together and maybe trying something like the Varilux.
I'm not sure why the Rodenstock is sharper.....is the lens material or
design. I think the Varilux also uses poly too.

.

Relevant Pages

  • Re: Does AR Coating Improve Vision?
    ... But each day since I've gotten the glasses it feels as ... lens design, no AR, can have a cumulative effect on visual comfort. ... The Rodenstock, practically crystal clear. ... Life had extremely good distance vision. ...
    (sci.med.vision)
  • Re: Does AR Coating Improve Vision?
    ... But each day since I've gotten the glasses it feels as ... lens design, no AR, can have a cumulative effect on visual comfort. ... The Rodenstock, practically crystal clear. ... Life had extremely good distance vision. ...
    (sci.med.vision)
  • Re: Does AR Coating Improve Vision?
    ... But each day since I've gotten the glasses it feels as ... lens design, no AR, can have a cumulative effect on visual comfort. ... The Rodenstock, practically crystal clear. ... Today I visited Eyemasters to do a verification that the lenses were ...
    (sci.med.vision)
  • Re: Newbie cant see weld pool
    ... Torch is going to be slanted a bit away from direction of travel, ... You can change you orientation to the reflected light or even make a flap to go over the back of your helmet. ... autodark lenses are worse for reflections than regular ones. ... There are more internal reflections because there are more layers in the lens the light that comes in from the front has to pass through. ...
    (sci.engr.joining.welding)
  • Re: Nikkor 50mm F1.8 ghosting issue with D70
    ... The two bright lights are originated from the headlights of the ... lights they are also reflections, ... plane glass element in the lens or in front of the lens. ... into ghost images. ...
    (rec.photo.digital.slr-systems)