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What am I seeing ? |
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dw0229
Optics Apprentice Joined: December/21/2010 Location: boaz,alabama Status: Offline Points: 121 |
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Posted: October/23/2016 at 20:22 |
Here is an odd question . Started not to even ask but it keeps gnawing at me. And probably one of our experienced optics gurus knows the exact answer. The other evening I was doing some scope testing and came back in the house to the kitchen where we have a overhead light fixture with 2 bulbs. I had a Zeiss Diavari 2.5-10x50 in my hand with the objective lens up. So I see this almost mirror reflection of those 2 bulbs overhead. Out of curiosity I go get a Leupold VX-R 3-9x50 and put it under the light. Now I can see only very little reflection. Try it with a Schmidt and Bender and there's improvement over the Leupold but not nearly as ch of a mirror type reflection as the Diavari. Just found it interesting and couldn't explain it.
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anweis
Optics Master Joined: January/29/2006 Status: Offline Points: 1148 |
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Glass and glass coatings reflect light. Nothing to worry about.
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dw0229
Optics Apprentice Joined: December/21/2010 Location: boaz,alabama Status: Offline Points: 121 |
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Yes. I understand that glass -coatings reflect light. What was very odd to me was that with the Zeiss there was an almost mirror image and the Leupold barely reflected. Are not coatings referred to as anti-reflective coatings ?
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13181 |
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How much of a reflection you see with your eye depends on the coatings, but also n the shape of the glass and the angle at which you are viewing.
The best test on whether that makes a difference is to use the scope around sunset time and see if you have veiling glare issues. ILya
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dw0229
Optics Apprentice Joined: December/21/2010 Location: boaz,alabama Status: Offline Points: 121 |
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Thanks ILya.
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