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That looks ok.

You probably mean a beam combiner. The beam diameter depends on the focal length of the collimating lens. A LOC with an AR-coated lens will output ~300mW no problem...

OTOH, people just doing something because others tell them to do it (or not do it) isn't the proper way... advice is just advice, it's not an order. And keeping the choice of buying from yotang away from the customer isn't the proper way either, for the same reason. Just because the others are...

What? No, I didn't feel you were responding harshly to my comment, not at all. (I did have to look at your posting above some time to see that "recommended him" refers to the customer for whom you got the laser, not me - the first interpretation didn't make sense). And one thing's for certain...

1. Open the shutter to a low f-number. Don't use the lowest one you've got, stay one or two clicks above it (the lowest one will most likely reveal serious lens aberrations). 2. Generally use a focal length in the 50mm area (well, for analog cameras - I guess for digital ones that would be...

1mrad is a good all-around first approximation. I once measured my LPC red with VirtualVillage AR acrylic lens at <0.5mrad, but you'll lose that just by shaking the laser, due to the loose-fitting lens housing (even more loose than the Aixiz one). Still, you should easily be able to focus it...

The original light was 30W, with an incandescent bulb. Now matrixcs wants to replace it with the 10W P7 quad-emitter LED. The letter/number combo designates the efficiency (in lm/W). P7 is an older one, with ~90lm/W. Q5 is the current standard for high-quality flashlights (~110lm/W). The...

That's what I gathered. OTOH, 0.5mW now seems to be a bit on the low end..?

No, you don't know what you're talking about, and the gap seems to be too wide to bridge. Sorry.

If the manufacturers have done their job right, yes.

Good idea. What you see with these glasses will be just the longer-wavelength fluorescence light, not the laser light itself. Nearly everything gives off at least some fluorescence when illuminated with 405nm light.

Where's your problem?

True indeed. Still, as per my last sentence, I feel this would have been an experience that you wouldn't hand off with a simple "... and it reflected into my eye." and no more :beer:

mysql is an open-source relational database that supports the SQL query language. The 3-char limit is not due to the DB itself, but to the forum SW (and a rather common limit to any text search system). Reducing the limit to 2 would have the main effect of considerably increasing the space...

Amazing. Once this was a Nobel prize matter, now it's a hobbyist's occupation...

Some people report that they can't focus a BR with the knurled focusing ring attached to the Aixiz - the lens can't be screwed in sufficiently. Try removing it. It may also be that the diode hasn't been pressed into the housing fully.

A voltage divider doesn't work. It's ONLY for dividing voltages. They're not usable if you want to draw current. All you need to do is to apply Ohms law to them to see it.

With diffraction glasses you could determine right away whether it's really yellow or a red-green combo.

In Budapest they've got a planetarium where they are showing laser shows every evening. I saw the Queen version when I was there recently. Quite nice, but not as impressive as I'd have thought (the chairs were fiendishly uncomfortable) - maybe not enough smoke? For me, the show was too heavy on...

Don't post all this info on LPF. There are people there who'll go into foaming fits if you tell them someone is pointing a 5W green laser into public airspace... in a city to boot :crackup: