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A couple of questions for the optical engineers

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/16/2011 at 13:21
powderburn View Drop Down
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First question is how do the plastic lens in a average set of $250 eyeglasses compare to the lenses in a most scopes. Are we talking comparable to a tasco or a fullfield ii or a zeiss?



Second given scopes of equal quality is/can the human eye be tricked into thinking scope A is better than scope B because the reticule is thicker, darker etc. ? In other words are some of the things we see really better optics or is it just a trick on our eyes?




Edited by powderburn - April/16/2011 at 13:23
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/16/2011 at 14:38
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My glasses have glass lenses. Plastic scratches more easily than glass.  Some eye glasses are made by Zeiss.   This is almost a trick question compareing apples to oranges.  Koshkin can probably give you a Physicists explanation of how they compare.  I will say when comparing scopes I really notice a big difference in quality looking through Zeiss, Bushnell 4200, Leupold  VX3  what I would call mid priced optics and the cheap optics like Tasco, BSA etc. I find the difference worth the expense.  At the same time while I would like to own some $3000 + scopes it's not likely to happen any time soon.
 
The eye is not "tricked" but different people like the look of one reticle better than another and the coatings used, filter out or intensify certain tones.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/16/2011 at 22:31
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Some scopes have coatings that are geared towards the indoor lights. And so they look better to the eye when viewed indoors. But they look worse when viewed outdoors. So it is best to view scopes outdoors in the type of light that they are going to be used in.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/17/2011 at 16:10
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Originally posted by powderburn powderburn wrote:

First question is how do the plastic lens in a average set of $250 eyeglasses compare to the lenses in a most scopes. Are we talking comparable to a tasco or a fullfield ii or a zeiss?



Second given scopes of equal quality is/can the human eye be tricked into thinking scope A is better than scope B because the reticule is thicker, darker etc. ? In other words are some of the things we see really better optics or is it just a trick on our eyes?



You can not compare eye glasses to multi-lens optical systems like riflescopes.  It is not even apples-to-orange.  It is more like apples to walruses.

If you are talking about individual lens quality, the best glass lens is better than the best plastic lens.  However, a high quality plastic lens is better than a crappy glass lens.  Like most things, it really comes down to who made it.

Some scopes out there actually use plastic lenses for some of the internal components (no, I will not tell you which ones).

As far as "better optics vs trick of the eye" argument goes.  It also makes no sense.  Everything is trick of the eye because our brain is better at processing some types of information than others.  Generally, as far riflescopes go, people talk about optical quality more than they should.  What they should be paying more attention to is image quality.  Is the image quality you get out of a weapon sight good enough?

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/17/2011 at 19:48
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Thank you ILya I really didn't figure it was an exact comparison but I got to thinking here I am sweating over (not really) what scope I use a few hours per year yet I really have no idea about the quality of the lens I use constantly to earn my living. I really didn't mean to restrict it to plastic as glass lens would be applicable here too, mine just happen to be plastic because I look down a lot. I was really asking more about the polish, imperfections etc.

What got me thinking about how much of our descriptions of scope quality is perception rather than fact. For example I have several older scopes that if you are looking into the sun or at a shallow oblique to the sun the crosshairs are not as sharp while I was looking thru my fullfield II and the duplex reticle seemed to hold it's contrast /sharpness better. Or maybe it just that the reticle is slightly heavier in oe scope over the next It made me wonder of we tend to think this scope is better optically as the reticle is sharp etc while in reality the actual target image may have been equal in both scopes or maybe slightly inferior in the but since the reticle was in the forefront our eye concentrates on that and doesn't distinguish the slight difference in the target image.
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