Advice on large long distance scanning onto white cliffs

[mixedgas]

At really long throws, bearing noise in the galvos can come into play. Suggest Cambridge or other very high quality scanner. Plus a very low divergence laser. Also use potentiometer based analog size and position controls, don't depend on the software based ones. I'll explain why another day.
Steve

[Laserhobbit]

re the potentiometer based size control. I think Steve is talking about quantisation due to the digital scaling. Effectively it reduces your resolution of the amplitude of the scan signal. Been a while, but is this the case Steve? Just wondering if my old head is still keeping up lol

Cheers

steve

[danielbriggs]

Minimum:
532nm OPSL >20W.
CT 6210HP or better.

At those distances, consider beam expansion.

Realistically... get closer.

[dzodzo]

if using for text, i'd suggest more projectors, let's say 8 projectors, each for one letter displayed at a time with low scan angle and then synchronize the show so that projectors will work together to create texts but depends on the budget

[mixedgas]

re the potentiometer based size control. I think Steve is talking about quantisation due to the digital scaling. Effectively it reduces your resolution of the amplitude of the scan signal. Been a while, but is this the case Steve? Just wondering if my old head is still keeping up lol

Cheers

steve

Depends on the controller, but quantization is the serious issue.

Steve

[jammah]

Ok wow! thanks for all of your help guys I will admit some of it went straight over the top of my head
But I'm quickly being made aware of how serious pulling something like this off is, which is good it is exactly what I was after.
I have another meeting with him today and now I'm more aware of what would be needed I can reccommend that if he HAS to have something on the cliffs we have to get MUCH closer, I think a platform in stilts is a real possibility, I have Excavator tickets and access to a 20T machine at low tide I could ram 4 full rounds into the sand and build a platform, but even this is going to require a good chunk of cash!
I also had a thought, the camgrounds / stage is on the beach, a water screen on a anchored platform in the sea could be an option?
it would bring the projection much closer to the audience and I think could look really good
also the other night I did a small rock gig and stretched some thin clear plastic film up really high halfway between crowd and stage the effect was cool Beams + pictures
maybe something like that on a LARGE scale
anyway thanks again guys ill post back when I have more info from the organizer!
James

[planters]

Jammah,

I think the cliffs are nicely white. Are the conditions when this is to occur expected to be VERY dark at the position of the cliffs? This includes a moonless night. If the atmospheric conditions across the water tend to be clear (cold water) and you have approx 20 W of balanced color then I think this will work. It won't be impressively bright, but I think the enormous scale will make up for this and the presentation will work. I'm not going to say here why I believe this, but you might be able to test it. Can you rent or borrow a 5W, or there about, projector and set it up on the beach for a test? 8-10 W of 445 alone will not do it.

[White-Light]

also the other night I did a small rock gig and stretched some thin clear plastic film up really high halfway between crowd and stage the effect was cool Beams + pictures

A lot of people on here have used Skeeta Scrim - a type of mosquito Mesh. It's hard to see, lets beams through, has no real reflectivity unlike plastic and because it is a mesh, also won't blow around as much in the wind when secured.

This looks like a lem or mini meeting of people that shows the scrim in place:




This is a show through some kind of scrim:

[Pitts]

Hi James
Just saw this thread if yours.
That's a big ask... Rhythm and Vines on site might be a better one to go for.
I just did the Te Matatini event up here with Chris G from your neck of the woods.

Happy to kick around lasers if your ever passing through Rotorua.

Scheduled to do a couple of lasers shows here end of July with Pyros if your up this way.

Feel free to PM anytime.

Regards

Ray
Rotorua
NZ

[Jem]

Hi Ray

Delighted to see you're still around, we don't seem to hear a lot from you these days. I hope you're keeping well.

Take care

Jem