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Plastic Lenses

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/06/2006 at 12:29
Bird Watcher View Drop Down
Optics Master
Optics Master

Joined: August/30/2006
Status: Offline
Points: 1523
I like to visit other binocular forums relating to astronomy & recently an individual shared something with me that I would like to pass along on this Optics Talk Forum.

The story goes like this:This individual owned a Nikon 10x50mm porro prism binocular and he dropped it and consequently the binocular was rendered unusable.(the prisms were knocked loose) He decided to experiment and take it apart just for the learning experience.

He did not elaborate much, but, in the process of disassembly he encountered a plastic lens element in one of the tubes. He commented that he was not impressed with the way that they were made. (the binoculars)

Also, he commented that he was aware that the lenses were suppose to be MC/Multi-Coated, but, that only the "outer" lenses were.

My reason for posting this is, although I realize that the model of binocular is a very low-end binocular, I am wondering how many other companies are doing the very same thing, to cut costs.

There is alot of emphasis on this forum with regards to the overall weight of a binocular for hunting applications, etc.

Do we as consumers want to sacrifice a couple of ounces in weight for inferior lens elements, and, possibly, degraded optical quality showing up in the viewing image?

I'm sure if we knew about all the price cutting short-cuts that are being used by manufacturers we would be more inclined to save up a few extra dollars & go with a higher level product, or model.

I hope that this thread will give us an "awareness" of the products we purchase for ourselves, and those we recommend to others.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/06/2006 at 13:11
Tero View Drop Down
Optics Apprentice
Optics Apprentice

Joined: December/04/2006
Status: Offline
Points: 135
I took apart a ten dollar roof prism, 8x20. All the parts were glass.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/06/2006 at 13:50
anweis View Drop Down
Optics Master
Optics Master

Joined: January/29/2006
Status: Offline
Points: 1026

Let us not put the "garbage" label on all things plastic. I prefer metal, rubber, leather, and crystal clear glass, but then again, i am old fashioned and conservative. The truth is, there are amazing plastics out there and some of them could be made as clear and clean as the finest crystal. In fact, what matters is numbers: difraction index, refraction index, light transmission, etc.

Just think of Glock pistols, contact lenses, Zeiss FL binoculars, and F1 cars. They have a lot of plastics in them. If the best lenses and prisms will one day be made of something other than glass, so be it. After all, we have switched from stone axes to steel axes to chainsaws to forest cutting robots haven't we?

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