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Posted: 9/10/2019 10:37:36 PM EDT
[Last Edit: 9/10/2019 10:44:38 PM EDT by 1paintball]
Has anyone seen these wavy lines on the image of a WP tube? This photo is of an L3 filmless tube from an astronomy forum, and I have a Photonis WP tube that exhibits the same artifacts , but only in very high light situations. edit - If you right click on the pic and select "view image" you can enlarge it.
Link Posted: 9/11/2019 12:00:54 AM EDT
Never, and I have looked at a LOT of tubes.
Link Posted: 9/11/2019 1:02:09 AM EDT
Yup.

I purchased THREE L3 unfilmed WP tubes a few years ago and TWO of them show this pattern.

It's called 'moire' BTW.

It's not considered a defect.
Link Posted: 9/11/2019 1:08:27 AM EDT
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Originally Posted By jdbastro:
Yup.

I purchased THREE L3 unfilmed WP tubes a few years ago and TWO of them show this pattern.

It's called 'moire' BTW.

It's not considered a defect.
View Quote
Lol, very interesting. I wonder what IS considered a defect? (Not a comment on your tube, OP, just in general, to this noob, it seems every possible flaw is considered 'normal' when it comes to NV).
Link Posted: 9/11/2019 2:04:40 AM EDT
[Last Edit: 9/11/2019 2:05:55 AM EDT by 1paintball]
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Originally Posted By jdbastro:
Yup.

I purchased THREE L3 unfilmed WP tubes a few years ago and TWO of them show this pattern.

It's called 'moire' BTW.

It's not considered a defect.
View Quote
Lol, I think this is your photo, It`s from the cloudynights forum
Link Posted: 9/11/2019 2:36:48 AM EDT
Interesting, it seems that moire is some kind of interference pattern that is common in digital photography and CRT screens, but why would it affect intensifier tubes? I didn`t think there are any scan lines on the phosphor screen or a diffraction grating inside the tube, maybe the pores of the MCP are acting like one? And why only WP tubes?
Link Posted: 9/11/2019 4:46:12 AM EDT
I have two L3 filmless WP and don’t have that. In real high light conditions just some minor fixed pattern noise.
Link Posted: 9/11/2019 3:21:51 PM EDT
The fiber inverter can, under certain circumstances, act as a diffraction grating of sorts as it has a fixed finely spaced light transmissive and opaque structure. Never seen the MCP act as a grating if the wavelength is below the cutoff for GaAs. Now with something past that, say 940nm, seeing a diffraction pattern is possible.
Link Posted: 9/11/2019 4:57:17 PM EDT
Are you referring to the chicken wire up top or the horizontal striations?
Link Posted: 9/11/2019 11:48:00 PM EDT
Link Posted: 9/11/2019 11:53:05 PM EDT
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Originally Posted By MILSPEC556:
He's referring to the wavy horizontal striations. Never seen that before, almost reminds me of fingerprints, but across the whole shebang
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Originally Posted By MILSPEC556:
Originally Posted By BelinTX:
Are you referring to the chicken wire up top or the horizontal striations?
He's referring to the wavy horizontal striations. Never seen that before, almost reminds me of fingerprints, but across the whole shebang
Yeah, I was gonna say it looks like a bigass thumb print. Honestly I had to go back and look closer to see it, didn't notice right away. Do they shimmer/move when viewed live? Luckily the only 'lines' I've seen in my filmless WP duals is the streaks from a high light source like full moon or street lights. Freaked me out and I thought I damaged them the first time I do have a bit of roaming dirt behind one of the lenses though.
Link Posted: 9/12/2019 12:54:31 AM EDT
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Originally Posted By 1paintball:

Lol, I think this is your photo, It`s from the cloudynights forum
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Yes it is my pic.

The wavy pattern is fixed and generally only visible under moderately bright conditions.

Want to see some more pics taken with this tube?

Check out these shots...
Link Posted: 9/12/2019 12:45:25 PM EDT
Link Posted: 9/12/2019 1:17:38 PM EDT
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Originally Posted By MILSPEC556:

Wow those are impressive. Maybe I should leave some thumb prints on mine too
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Lol, oh man I wonder if that’s what it is
Link Posted: 9/12/2019 7:45:15 PM EDT
Link Posted: 9/13/2019 5:11:22 AM EDT
W new change of ownership L3 is probably got a lot of rookies unable to say no. RMA that shit they cooked the tube so hard it's gone plaid
Link Posted: 9/13/2019 7:55:13 PM EDT
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Originally Posted By will-1:

Lol, oh man I wonder if that’s what it is
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Lol, I thought that at first when I saw it on my Photonis tube, but then I found the image of the L3 tube with the same defect, so I pulled mine and cleaned it.... still there. It`s defiantly a flaw if some tubes have it and others don't, sort of like the "dirty cathode" defect no one talks about...
Link Posted: 9/14/2019 3:19:33 AM EDT
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Originally Posted By NSFJojo:
W new change of ownership L3 is probably got a lot of rookies unable to say no. RMA that shit they cooked the tube so hard it's gone plaid
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We don't even have a new sign out front. ;-) It's the folks in Roanoke that are being sold off.
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