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Enchanted Beams Thread

ArcticDude

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Do you have a 589nm? If so can you take a picture of it compared to the RGB.
Unfortunately I don't have a 589nm :eek:
 
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paul1598419

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I think the new camera is a keeper. It seems to do well with differing lighting areas in the same frame. How many pixels? I still love the scene outside your door. +rep.
 

Radim

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ArcticDude, one tip for focussing of scenes like this one: Get a high lumen flashlight with wide angle. Illuminate the scene and just focus on point you get after you apply camera settings to get desired depth of field. Then when ready use remote control with 2 s delay to start exposure. As it is good to keep it autofocussed in some scene types (like the one in your recent pics), you need to illuminate scene in the focus point to allow camera focus there (I see green squares on LCD when and where focussed) and than during the 2 second delay switch the light off before the exposure starts. Thats how I do it and it gives me much better results then using manual focus (and it takes less time to set up).
 

ArcticDude

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Last night was unbelievable clear and cold.
Freezing north wind made an extra bite on it, so I had do little camp fire at the shooting place.

Nothing tastes better than a cold beer and snacks on camp fire. -What a wonderful night! :p



















 

Alaskan

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Love the colors, but the white is so cool to me, I like that the most but having the ability to change colors is awesome.

I did a comparison between the divergence and power of your Optlasers 400 mw single mode RGB module and their 3.5 watt RGB multimode unit, at any distance at about 4 meters and beyond, the lower power single mode unit delivers greater light intensity within a smaller area compared to the higher power multimode RGB:





To produce a higher amount of brilliance at distance, the higher divergence multimode RGB unit would need to output close to 15 watts to compete with your 400 mw single mode laser!



Put a 5X beam expander on your 400 mw single mode RGB unit to produce a 25mm/1 inch diameter fat beam and the 3.5 watt multimode (at its divergence) would need to produce over 350 watts to equal its intensity per square mm beyond 1000 meters distance:



https://www.laserworld.com/en/laserworld-toolbox/divergence-calculator.html#divergence
 
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Radim

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These modules compared, 3.5 W does not make much sense to me. May be usefull only for short distance laser show. 400 mW seems reasonable for such a portable laser as ArcticDude's is. Thanks for comparing them.

Unfortunately I cannot rep you yet, Alaskan, not even ArcticDude. Spreading time...
 

Alaskan

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It amazes me how much more light intensity can be delivered at great distances when using single mode diodes compared to higher power multimode diodes. The higher divergence lower power 400 mw unit would not be suitable for a light show laser where you are not concerned with divergence as much due to the light show being relatively close in, for such shows brilliance/power and acceptable divergence is all they need, but if your aim is to deliver a tighter beam a great distance away, I think single mode is awesome, so for pointers, these are great.

Some folk like the power of MM diodes to burn things so a higher power laser is what they need without concern for divergence if they can focus the beam to a point, so single mode isn't normally chosen for that except perhaps the higher power 405 nm SM diodes, but for shooting beams into the night sky to the underside of a cloud, or some other distant object the combined output of three single mode diodes in this RGB pointer is perfect for what I want.

I like to spread the reps around, the more I get, the more fun I have giving them out. I can't rep some members enough though.
 
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Radim

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Exactly. I agree with every point. Just to add I personally do not see any reason why to use RGB for burning. But I know, you mean it in general.
 

Radim

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Awesome pics as always. Thanks for sharing them. I like the natural lighting of the scene and its kind of calm feeling and perception of endless space which you can touch with the beam if you like. Great camera you have ArcticDude. What lens and what settings did you use?
 

ArcticDude

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Awesome pics as always. Thanks for sharing them. I like the natural lighting of the scene and its kind of calm feeling and perception of endless space which you can touch with the beam if you like. Great camera you have ArcticDude. What lens and what settings did you use?
Thanks Radim..
Settings are ISO 1600, Exposure 2-6Sec, Lens: Samyang 12mm f2.0 full open aperture


Setting the Sun pt.3

 




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