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Monarch coatings issues

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groujo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote groujo Quote  Post ReplyReply Direct Link To This Post Topic: Monarch coatings issues
    Posted: May/06/2018 at 14:47
I just got a pair of Nikon Monarch 7s (8X40) for birding. I thought these were going to be a major upgrade, but I have an unexpected problem. When I look at, say a tree limb with a white sky behind it, the limb appears to be traced in magenta and green. That is, the upper edge of the darker limb are a vivid magenta, and the lower is a vivid green, as if they'd been drawn in like a cartoon. I can tell looking at the lenses that these colors correspond to the coatings, so that has to be the issue. This is making me mistake the colors on birds as well. 

  What could be causing this? is this a usual thing or a defect? Something Nikon would fix? I got the things new, but on ebay.

SMN
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probably View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote probably Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 17:28
sounds like chromatic aberration. 

https://www.allbinos.com/index.html?lornetka=all&producent=37&lornetka=1475&powiekszenie=0&srednica=0&pryzmat=0&sort=
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WJC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WJC Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 17:36
The coatings have very little to do with the colors you're describing. You are describing classical Chromatic Aberration—and if you're not overly sensitive—LOTS OF IT. That is a problem with lens design and can be especially troubling for those trying to identify birds by, often subtle, differences in color.

You should read up on chromatic aberration.

And welcome to this forum.

Cheers,

Bill
"What lies behind you and what lies before you are tiny matters compared to what lies within you."—Ralph Waldo Emerson
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WJC Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 17:38
Sorry, probably. When I started my message, you had yet to post one.
"What lies behind you and what lies before you are tiny matters compared to what lies within you."—Ralph Waldo Emerson
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groujo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote groujo Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 18:17
Thanks for that diagnosis. 

I'll have to read more about it. 

It's strange: I've used many different binoculars before this without ever seeing an effect like this. It makes these binoculars almost unusable imo. And that really surprises me because I'd heard really good things about this model. Any chance it's just a defect on this pair? 
SMNelson
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Son of Ed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Son of Ed Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 18:18


Image result for Photography


Chromatic aberration.....









Visit the Ed Show
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Post Options Post Options   Thanks (1) Thanks(1)   Quote WJC Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 20:31
Originally posted by groujo groujo wrote:

Thanks for that diagnosis. 

I'll have to read more about it. 

It's strange: I've used many different binoculars before this without ever seeing an effect like this. It makes these binoculars almost unusable imo. And that really surprises me because I'd heard really good things about this model. Any chance it's just a defect on this pair? 


180506

Hi, Steven:

All but the insanely expensive binoculars exhibit CA; some far more than others. You will notice it as badly as shown in Ed’s example in the only poorest instruments. However, when trying to distinguish between two species of birds separated by 1.5 HUES (as opposed to colors) even an aberration half that bad would be maddening. The problem can be adequately addressed with $$$$ and can be corrected with $$$$$$—through exotic glass types, additional elements, aspheric elements, or a combination of some, or all, of the above.

Dig in; you will make mistakes. But, that’s part of the game. The attached graphic may be helpful.

Bill

PS Sorry; no attachment. Although it was a simple, SMALL jpg, this idiot program says it can't find it. Bless its little digital heart.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote probably Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 21:46
if you are looking for a nice, inexpensive pair of binos, try these.

 https://samplelist.com/zen-ray-8x43-zen-ed3-binocular-demo-b-1.html
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Son of Ed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Son of Ed Quote  Post ReplyReply Direct Link To This Post Posted: May/07/2018 at 05:17
Originally posted by probably probably wrote:

if you are looking for a nice, inexpensive pair of binos, try these.



Image result for Zen


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WJC View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote WJC Quote  Post ReplyReply Direct Link To This Post Posted: May/07/2018 at 22:46


Steven:

I failed to mention, those AR coatings have no color. What appears to be “color” is the wavelength of light they reflect. Intuitive? No. Accurate? Yes.

Bill

"What lies behind you and what lies before you are tiny matters compared to what lies within you."—Ralph Waldo Emerson
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Post Options Post Options   Thanks (0) Thanks(0)   Quote groujo Quote  Post ReplyReply Direct Link To This Post Posted: May/23/2018 at 14:42
Thanks to everybody who commented here. Especially WJC. 

  
SMNelson
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