USB Scannersafety

[mccarrot]

No, its very simple. No pay = no scanfail.

I will not keep asking for my money.

[edison]

I tranferred the money so my name can be removed from the still has to pay list

[Gento]

the contents wait for the dispatch.

Gento

[cyberb0b]

Cant wait till i get my hands on them

[mccarrot]

This group-buy is closed now.

I have transfered the money to gento's bank account.

The English manual is almost finished.

[Stoney3K]

A negative 2.75 power lens works really well for projectors with typical divergence and power levels of 500 mw or less, assuming a standard viewing distance of 20 ft or greater.

I bought a *bunch* of these lenses for $2 each from AllElectronics.com and handed them all out at FLEM ver 5 back in March. They were cheap plastic, but they worked really well. I just noticed they've lowered the price to only a buck. Pick up a couple and give it a shot.

Every once in a while they have nice glass lenses for around $10 a piece, but I didn't see any negative lenses with enough power to be useful for diverging the beam of a projector. (You really want at least -2.5 power, and with more powerful projectors you might need up to -4 power.)

Adam

Won't using a negative lens seriously impact the aesthetics of your show?

The reason we're using a laser for beam displays is because laser beams are so darn sharp, you can put a ruler alongside them. I'm a bit curious as to how they would look when seriously diverged, wouldn't that undermine the reason for using a laser instead of a scanner or moving light with gobos, or a DLP projector for beam displays?

[Doc]

Won't using a negative lens seriously impact the aesthetics of your show?

The reason we're using a laser for beam displays is because laser beams are so darn sharp, you can put a ruler alongside them. I'm a bit curious as to how they would look when seriously diverged, wouldn't that undermine the reason for using a laser instead of a scanner or moving light with gobos, or a DLP projector for beam displays?

It will allow for more power to be used in a smaller venue, whilst maintaining acceptable power density for audience scanning.

A high power diverged beam looks more impressive than a low power tight beam.

[Stoney3K]

It will allow for more power to be used in a smaller venue, whilst maintaining acceptable power density for audience scanning.

A high power diverged beam looks more impressive than a low power tight beam.

Would it be an option to make the lens switchable by a servo or galvo, so you can place it in front when you do audience scanning, and remove it when you're doing ceiling beams or graphics?

A quick-and-dirty version of that would be to hack the lens in half and use the lens for the area you're doing crowd scanning, in favor of a 'no-scan' barn door.

[mccarrot]

At the next dutch LEM I will use them during my audiance scanning workshop. Then you can judge for yourself if tou think its usable or not. After the workshop you can also buy the lenses from me.
But its just like doc said, a powerfull fat beam is more impressive than a weak thin beam.

[sbk]

The main advantage of using this way is that a small increase in divergence would have a bigger effect on the power density than a comparable power decrease...
If you pass from 1 to 2 mrad, you will have less than 1/3 of the power density at the same distance, while only 1/2 when dividing the power by 2!