Old 09-30-2012, 11:27 PM #1
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Default Ultra cheap low quality 5x expander

Found this at the dollar general near me. It's a pair of 5x30 binoculars for $5.

They're lightweight, small, and the part that you look into is easy to shoot a laser through and they actually seem to expand the beam right.Not bad for the money.
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Old 10-01-2012, 08:08 PM #2
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Default Re: Ultra cheap low quality 5x expander

Have you tried this with a 445nm laser? I would assume that it will just melt the lenses, but if you have a low power laser, I suppose it could work.
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Old 10-01-2012, 08:40 PM #3
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Default Re: Ultra cheap low quality 5x expander

Many of us have used cheap binoculars or monoculars as expanders. It works okay, but you lose about 40% of the power.
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Old 10-01-2012, 09:01 PM #4
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Default Re: Ultra cheap low quality 5x expander

Quote:
Originally Posted by Cyparagon View Post
Many of us have used cheap binoculars or monoculars as expanders. It works okay, but you lose about 40% of the power.

They work with 405nm and I've found alot binoculars of decent quality and telescopes dont since they have an anti UV and near UV coating.
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50mw 660nm DX pen
"5mw" overspec IQS Blu-ray does around 50mw
Spartan 589nm 50mw likely higher no lpm to test but skin feels warm.
3.107 watt 445nm zero laser
473nm labby peak at 34 mw
808nm over a watt from a 400mw green that came loose and lost the crystal set
980nm with weak cyan line focousable
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Old 10-02-2012, 01:11 PM #5
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Default Re: Ultra cheap low quality 5x expander

Generally any piece of glass will loose about 10%, unless it has special wavelength tuned anti-reflection coating. If you use optics with many elements, the loses will stack. Binoculars have at least 4 pieces, and 2 prisms. It is better to remove optics from the laser, remove eye-piece from the telescope, and use only the 'objective' part of the telescope laser. But then you need to match the focal lengths, which is not so simple. In general diode lasers can be coupled nicely with photographic lens. But those especially have a lot of elements.
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