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Old June 27, 2013, 09:15 AM   #1
UtopiaTexasG19
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Will A 2x Doubler Change The Fiels Of View?

My neighbor down the road has let me borrow his Gen.1-2.5X50 NV scope that I am playing around with at short range for armadillos in my yard at night.
He has moved on to Gen 3 scopes.
I ran into another friend the other day who has a 50mm Doubler that he says will thread into the lens of the scope and make it into a 5X50.
What can I expect from adding the doubler as far as "field of view" width compared to the 2.5 X 50 lens?
I have to admit to being uneducated on this subject and any replies are welcome.
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Old June 27, 2013, 11:47 AM   #2
wogpotter
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It will halve exactly.
Think of the doubler as a magnifying glass that expands the center of the image & spreads it out over the whole viewing area. It will reduce light output by 75% (2-stops or 50% plus a half of 50%) as compared to the original because its removing 1/2 the radius of the imaging (objective) lens by only "seeing" the center 50%.
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Last edited by wogpotter; June 28, 2013 at 12:46 PM.
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Old June 27, 2013, 06:01 PM   #3
UtopiaTexasG19
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Can I assume that the lines of the reticle will appear twice as thick also?
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Old June 28, 2013, 06:40 AM   #4
wogpotter
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if it goes behind the reticule then yes. Everything is magnified 2X.
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Old June 28, 2013, 06:51 AM   #5
Double Naught Spy
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wogpotter is right. That is how it will work.
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