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Old 06-16-2014, 09:02 PM #1
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Default Any other lens options?

So from what I have learned so far in my short time here we have three options available.

1. Plastic 3 element, good for dot quality and beam quality on sub 1 watt lasers.

2. Glass 3 element same as above but for 1w+ lasers

3. G1/G2 single element, most expensive by very large margin but best optical power(+20-40% over three element) but beam/dot quality suffers.

Do we have any other options I don't know about?


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Old 06-16-2014, 09:30 PM #2
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Default Re: Any other lens options?

There are some other lenses in the $7-$10 range that are almost identical to the G-types. Last I heard there was a GB getting put together for some of these: Group buy on g type lenses - Page 4 - Laser Pointer Forums - Discuss Laser Pointers.
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Old 06-16-2014, 09:46 PM #3
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Default Re: Any other lens options?

Quote:
Originally Posted by KrowBar View Post
There are some other lenses in the $7-$10 range that are almost identical to the G-types. Last I heard there was a GB getting put together for some of these: Group buy on g type lenses - Page 4 - Laser Pointer Forums - Discuss Laser Pointers.
I am aware, I ordered 3 from the ebay page for $24 shipped and am waiting for them to arrive so I can compare them to my real G2 lens. If they check out ill buy more.

But I was honestly more interested in a higher quality 3 element glass lens as while the burning/optical power of the G2 is great it does horrible things to dot/beam quality.
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Old 06-17-2014, 12:31 AM #4
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Default Re: Any other lens options?

I've never heard of a plastic 3 element. The standard acrylic lenses that come with the modules are single
element if that is what you mean. Besides the others you mentioned, there are AR coated acrylic single
element lenses that do somewhere between a 3 element glass and a G-2. Then there is the G-9 that
comes out of the BenQ projectors which outdoes just about everything. There are really no limits as long
as it can be crammed into a lens barrel. TunedCavity had an idea for a 2 element lens using sled optics
that had better divergence and also passed more light.

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Old 06-17-2014, 12:33 AM #5
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Default Re: Any other lens options?

Quote:
Originally Posted by The Lightning Stalker View Post
I've never heard of a plastic 3 element. The standard acrylic lenses that come with the modules are single
element if that is what you mean. Besides the others you mentioned, there are AR coated acrylic single
element lenses that do somewhere between a 3 element glass and a G-2. Then there is the G-9 that
comes out of the BenQ projectors which outdoes just about everything. There are really no limits as long
as it can be crammed into a lens barrel. TunedCavity had an idea for a 2 element lens using sled optics
that had better divergence and also passed more light.

good to know, I assumed the plastic lens was a 3 element as its dot looks better on my 300mw 660nm than my G2 lens.

also does that tunedcavity lens exist or is it still in development?
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Last edited by Rifter; 06-17-2014 at 12:40 AM. Reason: added content
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Old 06-17-2014, 01:10 AM #6
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Default Re: Any other lens options?

You have to make one yourself using extracted sled optics and a lens barrel.

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Old 06-17-2014, 02:00 AM #7
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Default Re: Any other lens options?

thanks for the link, people in the comments of that video appear to believe its inferior to the G2 lens, but seeing as its so cheap to make I might give it a shot.
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Old 06-17-2014, 02:37 AM #8
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Default Re: Any other lens options?

I am in the process of some lens testing. I am waiting on some mounting and alignment hardware, but hope to get the testing done in the next couple weeks. It is my understanding that the superior beam quality from the 3 element is due to 2 factors. One is a longer effective focal length that gives a wider beam with less divergence. The 2nd is that it clips the wider parts of the beam. My proposed lens solution involves removing all clipping for the power of the g type, but have an even longer focal length. This requires well shaped fast aspherical lens, and I have a few to try.
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Old 06-17-2014, 01:02 PM #9
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Default Re: Any other lens options?

Quote:
Originally Posted by KrowBar View Post
I am in the process of some lens testing. I am waiting on some mounting and alignment hardware, but hope to get the testing done in the next couple weeks. It is my understanding that the superior beam quality from the 3 element is due to 2 factors. One is a longer effective focal length that gives a wider beam with less divergence. The 2nd is that it clips the wider parts of the beam. My proposed lens solution involves removing all clipping for the power of the g type, but have an even longer focal length. This requires well shaped fast aspherical lens, and I have a few to try.
I'd think both these requirements could be met with the inclusion of a second lens. The first being the short FL G2 to avoid clipping, and the second for fixing the issues caused by the short FL G2. Perhaps we just need a better second lens than used in the sled above?
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Old 06-17-2014, 02:59 PM #10
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Default Re: Any other lens options?

Quote:
I'd think both these requirements could be met with the inclusion of a second lens. The first being the short FL G2 to avoid clipping, and the second for fixing the issues caused by the short FL G2. Perhaps we just need a better second lens than used in the sled above?
Well, any time you add elements you introduce additional losses, which is another reason the 3-element has lower power, but you are correct in principle that using several elements you can get the beam shaping and aberration correction that results in a nice looking output. This will come at additional $$cost however, which does seem to be one of the parameters of interest to the OP
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