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Just received my new 520nm last night. Wow its much brighter than I expected Very well assembled, huge upgrade from cheap ebay 532nm and appears significantly brighter than my 650nm Also with great coupon packaging that i kept for use :crackup:! I'll see what it looks like at long distance...

Haha, I posted last night in the buy/sell section asking about that guy's Phobos PL520 with boost at ~300ma. Hopefully he still has it... -- Did a test run on Tues. night with the cheap 532nm on a 2 mile stretch. On his side was total darkness, I was at the public marina side with heavy light...

I'm interested in the 520nm, sent a PM :)

already bought a 532nm and a 300mw 650nm module (getting x-drive v7 from flaminpyro when they are in stock), aiming to do this next week or so with the 532nm starting w/ a 2 mi strait first

I almost got the S4 host with copper heatsink on survival lasers for it butI sent a message to jayrob earlier and he sent me DTRs shop page (after I already paid for the aixiz kit) Now I'm going with this https://sites.google.com/site/dtrlpf/home/diodes/3-8mm-650nm-300mw-diode So i have to...

Thanks for pointing that out, was rushing earlier and mixed up the units 21mm < 30mm They haven't shipped it out yet so I paid extra and replaced my entire order for the 650nm 200mW diode driver and module kit, instead of going through the trouble of a refund :crackup: So I'll have 2 lasers...

No problem at all, ask any questions you have Very true, thank you :thanks: That sounds good enough for now, the camera should have a high chance of picking it up (like the videos) 12x30mm Aixiz Laser Mount and Lab Holder | eBay I just bought one of these for mounting to a tripod, so I...

Sure, maybe even 3 inches :na:. I can always buy something more expensive later. I'm going with the other members on this one How to Determine the Distance to the Horizon - For Dummies Could You See the Curvature of the Earth in this Airport? | WIRED

I sent a couple of emails out to some companies but they haven't responded I don't mind so much anymore, having the perfect device for this would really only be useful for measuring an accurate height difference. That would be great, but measuring the cutoff point is good enough for now It...

I just bought it, and since it was so cheap I can still afford something else too in case anybody has anymore suggestions. Thanks to everyone for their advice

Ok, I wont do the 445nm 532nm Green Laser Pointer Light Pen Lazer Beam High Power 5mW 16340 Charger | eBay Something like this is probably good enough

200mW 532nm https://www.youtube.com/watch?v=F6LSr8-zQDY If I can save $500 and just pick up any cheap 532nm then so be it, but I want this to work I feel like im running into circles so I'll give my decision another day to think about https://www.youtube.com/watch?v=iI7Qq1mYQlI

Ok, we're going to try it at different distances but we'll see if you're correct about the 7.5 mile span. If you hold up a piece of paper toward the moon, it's light will illuminate the paper. It just won't reflect like a mirror I can put a layer of reflective material over the cardboard, or...

This is exactly what we're testing for. As said before, this will be done at many different fixed heights above water level. I've gone through terrestrial refraction and horizon distance formulas with them factored into it, those will be put to test as well There is a difference between a...

It sounds like JetLasers is one of the top picks. I'm almost ready to buy the 445nm or 532nm from them with their beam expander The customer rep for wickedlasers just sent me this youtube video https://www.youtube.com/watch?v=V8Gex8S6Rjw They covered 7 miles in the city with heavy light and...

Well, as said before. If I can rent/lease a lab device, or reduce the distance down by 75%, that could work. Maybe I naively thought that this would be possible with todays handheld lasers, but i still think it could potentially work (perhaps with just a lower distance) There is also the 2w...

Nano Series | Red, Purple, Green Laser Pointer | Wicked Lasers 100mW 650nm 0.5 mRad Aixiz 650nm 200mW Laser Diode Driver and Case Kit | eBay 300mW 650nm Red High Power Laser Diode Module Kit with Glass Lens Heatsink | eBay If I can get this 300mW kit then I can spend more money on a beam...

Thanks for your recommendation, i wont be going with o-like for sure and the other links dont look as promising either I'm thinking of this 1w 650nm self-assemble kit now, its the last one so maybe i should get it before its gone 1W 638 to 650nm Red Laser Kit MX 900 Host Copper Heat Sink...

About 2.873m (9.5 ft) on a 12.1 km (7.52 mi) lake Using formula (calculator set to radians) h = r - r * cos(b / r) b = half of the distance to the lake in km r = radius And using that in comparison with Distance to the Horizon Calculator Gives us a rough estimate At 6 ft the horizon limit...

We are going to try to choose the best days that we can, and may have to repeat the test a few times. Unless the scattering is severe, we will at the very least be able to determine if it passes the convexity. Even better, if the weather allows, we can measure the height difference between point...