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Old 08-29-2014, 12:11 AM #241
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Default Re: [CLOSED] Starting gas for a pretty good price

That's a really cool shot! Oh it does make it look a little overly red. It's more orange with a pink tint to it. What makes it almost look like a neon spectra illumination sample


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Old 08-29-2014, 02:57 AM #242
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Default Re: [CLOSED] Starting gas for a pretty good price

Yeah it's a bit too red. I was mainly just messing around with my 50/1.8 that hasn't seen much use lately. Getting the right balance is pretty tricky with bare HeNe tubes. If you get the color it's usually over exposed. If you get the exposure right the color is usually off. The pic I posted was taken at f/1.8, 1/2000 sec @ ISO 1600. I might try again over the weekend. If I get decent results I'll start a thread in the multimedia forum.
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Old 09-27-2014, 01:08 PM #243
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Default Re: [CLOSED] Starting gas for a pretty good price

Received mine this week. It looks fantastic! I love seeing the emission lines of the gas with a grating:



I also noticed a strange thing. The weak dot that is projected from the HR (anode) side isn't a single dot!
There are at least two laser dots, the second one is much weaker and not aligned with the first one. It also looks slightly "redder", but it's probably due to the power difference (couldn't notice any WL difference with a grating).
I think there's also a third, very weak dot, but I'm not completely sure.


Anyone seen this phenomenon before?
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Old 09-27-2014, 07:21 PM #244
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Default Re: [CLOSED] Starting gas for a pretty good price

It's normal. The mirror has what is called a 'wedge'

The two surfaces are not quite parallel, to keep the ghost beam reflection from going back into the tube, which would cause erratic behavior.
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Old 09-27-2014, 09:59 PM #245
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Default Re: [CLOSED] Starting gas for a pretty good price

Cool, thanks!
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low 445nm: C6 from Survival Lasers (1351mW pk|1289mW avg|1100mW rtd)
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Old 10-12-2014, 01:53 PM #246
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Default Re: [CLOSED] Starting gas for a pretty good price

With the exception of the Portahene, gas isn't really my thing, nor is HV. However, I saw these, and thought of this GB, and wondered why you couldn't use one as a $4 power supply for your hene tubes, presumably with a beefier resistor on the output to pull the voltage down a bit to the 1300 V you actually need here.

DC 3V To 7KV 7000V High Voltage Generator Boost Step-up Power Module - Banggood Mobile

EDIT: On review, I don't think this unit provides enough current.
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Last edited by rhd; 10-12-2014 at 01:56 PM.
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Old 10-13-2014, 01:53 AM #247
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Default Re: [CLOSED] Starting gas for a pretty good price

Yep, you need 5-8mA on average, and it has to be filtered DC (HV caps), and you need an ignition pulse in the neighborhood of 10kV just to ignite the tube, and that's if the tube is healthy. HeNe's are a bit of a bitch to drive, not like CO2 or Argons.
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