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Old 06-21-2010, 11:21 PM #1
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Default Difference in transmission rates between two 405-G-1 lenses. Normal?

I took the lens off my Pocket Mini for my 445 build, and I just now replaced it with one I bought from Flaminpyro. Out of curiosity, I put it on the meter. I'm now getting 25mW more than with the previous lens (275mW.) I'd expect some amount of variation, but 25mW seems like a lot. How much can these lenses vary in terms of light transmission?


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Old 06-21-2010, 11:24 PM #2
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Default Re: Difference in transmission rates between two 405-G-1 lenses. Normal?

Is one dirty perhaps? The other option is that the distance or focus is different and so affects your LPM's reading, or that the lens housing itself affects the reading.
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Old 06-22-2010, 01:50 AM #3
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Default Re: Difference in transmission rates between two 405-G-1 lenses. Normal?

Its hard to tell where the other 10% goes - does the dot on a wall look any different between those two lenses?

10% wouldn't seem much, but considering the price for these lenses, i supppose it would be worthwhile to figure out what is going on exactly!
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Old 06-22-2010, 06:59 PM #4
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Default Re: Difference in transmission rates between two 405-G-1 lenses. Normal?

Were they focused to the same divergence before you tested them? focus can effect how much light actually hits the lens the right way.
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Old 06-22-2010, 11:52 PM #5
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Default Re: Difference in transmission rates between two 405-G-1 lenses. Normal?

Sorry for the delayed reply. Damn power went out. . .

I think I figured it out. In lens #2, the retainer ring wasn't quite snug, giving the lens about a .5 mm amount of play. When it slid up into the nut a little more, it gave the extra output. In the normal spot, it was pretty close to the first one.

Sadly, I slipped up and knocked a chip out of it trying to tighten the ring Bummer. . .

We should investigate this phenomenon, methinks.
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Old 07-01-2010, 09:23 PM #6
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Default Re: Difference in transmission rates between two 405-G-1 lenses. Normal?

Perhaps a different type of glass is was used to make the new lens accounting for better transmission of light through the new lens. Perhaps the new lens had a somewhat shorter focal length. Perhaps the new lens was AR coated this time. Without a data sheet your guess is as good as mine.

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