Optima lens for reds

[andy_con]

Edit:
Now, is anyone going to tell me whether the crazy stunt of blue-coated 405-G-2's used for reds has merit? At least one person says it does, and his pictures impressed others. But I'd like to know a bit more about any attempts in that general direction. Efficiency, mainly... as in: does the good light gathering ability get ruined by losses in the wrong coating, or does it do so well in ways that make up for that?

a 2mm fl lens from dave is cheaper than a g2 lens from dtr

[planters]

I am not pissed off at all; happy to help; even with manufacturers of the lenses but dave's bulk purchase will mean it in the end is best to get them from him, I am not on PL to make money from anyone. For me PL is a virtual space to help each other; less of an online market.

Ditto! And if some company can turn these ideas into useful products then good for them.

[The_Doctor]

a 2mm fl lens from dave is cheaper than a g2 lens from dtr

I got those for blue... As to the query, I know it's a bit Mulderesque, but when someone says a thing works well, perversely against expectations, that's interesting to me. And I still want to try 4mm fl first anyway, whatever the coating on it. I explained why, too.

[Galvonaut]

[snip] How they EVER got a patent for that I do NOT know...[/snip]

I'd be interested in what their patent covers specifically as I've seen lots of similar set-ups in my research (just not so many diodes). Does anyone know the details?

[The_Doctor]

Andy knows more, but I can tell you it's basically two things, 'knife edging' with mirrors steering beams at right angles to put beams closely parallel, and telescopes to change the tradeoff of diameter and divergence. Neither alone is patentable but Newton might have managed it if he could have, and wanted to, and it amazes me that putting the two together is enough to be significantly new invention after so many centuries, but they wangled it somehow.

[Galvonaut]

Patents can be a pain sometimes! I invented something when I was a teenager - even made a scale prototype but had no money to take it forward. Something similar was later patented by someone else. Proving that something is not in public knowledge is a tricky business.

Saying that, there are always ways of trolling