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Old 09-30-2012, 10:05 PM #1
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Default G1 or G2 or 2 piece Lens for burning

I am getting a 2watt 445nm for burning aiptasia in a reef tank. They can rang in size from microscopic to 1/2 in. in diameter at the stalk. I am wondering the pros and cons of both lenses? What would be your recommendations?



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Old 09-30-2012, 10:23 PM #2
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Default Re: G1 or G2 Lens for burning

They have the same focal length. Only the coating is different :
405-G-2: Multi- Layer "A" Coating
405-G-1: Single Layer MgF2

In practice there is not much difference in power.
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Old 10-01-2012, 02:36 AM #3
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Default Re: G1 or G2 Lens for burning

Well I just ordered the kit and it is not a g2 but a lens with 2 pieces of glass. The stated rating through the 2 piece lens is 1.7watts and 2 watts through the G1. Is there a big difference between the G1/G2 and these less expensive lenses?

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Old 10-01-2012, 02:54 AM #4
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Default Re: G1 or G2 or 2 piece Lens for burning

The three element element lens will have a lower divergence and is pretty inexpensive but it has a lot of splash with 445. The G-1/2 lenses will pass 300-500mW more power @ 1.8A with a M140 and has a much cleaner output but since it does not do much to correct the beam it has a more elongated line output and it is much more expensive. So it is a give and take. You cant really say one is better than the other. It is personal preference.
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Old 10-01-2012, 03:04 AM #5
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Default Re: G1 or G2 or 2 piece Lens for burning

Forgive my ignorance. So the multi element will give a finer end point when focused and the G1 will be a bit of a bar at the end point?
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Old 10-01-2012, 03:13 AM #6
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Default Re: G1 or G2 or 2 piece Lens for burning

Neither make a point with 445. The three element lens will just make a less elongated line.

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Old 10-01-2012, 10:30 PM #7
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Default Re: G1 or G2 or 2 piece Lens for burning

3-Element Lens: Improved dot size at far distance. Minor output power loss. Smaller beam size over distance.

G1/2 Lens: Improved output power. Brighter beam. Improved burning power. Smaller dot size at close range.

From what you describe as your intended use I would suggest the G1/2 lenses.
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