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5/28/2020 10:18:12 PM
Tacked DIY Cascade Tube Thread... (Page 17 of 17)
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Link Posted: 11/11/2017 1:06:34 PM EDT
[Last Edit: 11/11/2017 1:09:37 PM EDT by wattius]
Still waiting for that objective lens but i borrowed one from a camera for testing purposes. The aperture is way too high at F3,5-5,6 but it still sees better in the dark than naked eye.
It's not pretty but it works.

Video.

I also have to take back what i said before about it not making any noise because it does a little bit. i was not able to hear it when i tested the tube for the first time.
Link Posted: 11/12/2017 3:15:37 AM EDT
[Last Edit: 11/12/2017 3:28:14 AM EDT by hatti]
nice video!

seems like you get more distortion through a loupe eyepiece comparing to PVS-2 eyepiece.

to push cascade performance down to level of dark adapted eye you need to choke the lens down to f/10 or so,
thats according to my feeling.

loudness of whining is different from tube to tube, but newer ones usually are not loud.
worst one i had was an old early 80s p8079 (non HP) tube.

i have one tube with serial number over 20000 too, it does not make much noise.

where did you get the tube? starlightNV?
Link Posted: 11/12/2017 4:45:47 PM EDT
Thank you for the info.

Feels like the camera i'm using is amplifying the distortion. It's there and noticeable but not even close to how it looks like in the video. I'm now testing with a 50-200mm F4.0 zoom lens. Can zoom in pretty far but aperture is definitely an issue still.
Small clip with the zoom lens. Those buildings and lights are 2-4km away.

This is where i got my tube. They really shot up in price recently from what i've read.

A question or two, since you've had a few of these tubes from what i've gathered. How easy is it to cause damage to them with excessive light? I've pointed mine at some bright street lights very briefly while panning around and they leave a mark for up to 10 seconds before fading out. I believe that's not a big deal for as long as i'm not constantly pointing it at bright light sources. Also, have you noticed any degradation in performance on your tubes over time?

Will get back for at least one more post when i get the fast lens.
Link Posted: 11/14/2017 3:39:11 AM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By wattius:
Thank you for the info.

Feels like the camera i'm using is amplifying the distortion. It's there and noticeable but not even close to how it looks like in the video. I'm now testing with a 50-200mm F4.0 zoom lens. Can zoom in pretty far but aperture is definitely an issue still.
Small clip with the zoom lens. Those buildings and lights are 2-4km away.

This is where i got my tube. They really shot up in price recently from what i've read.

A question or two, since you've had a few of these tubes from what i've gathered. How easy is it to cause damage to them with excessive light? I've pointed mine at some bright street lights very briefly while panning around and they leave a mark for up to 10 seconds before fading out. I believe that's not a big deal for as long as i'm not constantly pointing it at bright light sources. Also, have you noticed any degradation in performance on your tubes over time?

Will get back for at least one more post when i get the fast lens.
View Quote
cannot really answer about tube damaging, because probably i am too careful with NODs, unfortunately,
but these trails from bright sources are nothing to worry about.

i live in unpopulated area, where there is no artificial light sources and even no sky glow, so my chances to damage a tube are small.
only once i got tube overloaded with light and built in emergency shutdown triggered.

one thing i would like to warn about is incandescent lamps  -  car headlights and especially these 500 watt PIR sensor activated floodlights.

have not noticed any signs of tube degradation yet.
i am reluctant to use NODs fully open in full moon conditions, dusk and dawn and in those midsummer "white nights" though.

i guess tube degradation is gradual process and it is very hard no notice without side by side comparison to some reference tube.
Link Posted: 11/15/2017 10:38:19 PM EDT
Thanks again.

Got the faster objective fitted today. Spent 2 hours testing it in the darkness and it's working really well so far.

This is the sort of image i'm getting during the darkest time.



A bit out of focus. Snow is providing a lot of illumination but i still could only see halfway down the road and the treeline, that's about it. The thing is really turning night into day.

The box is attached with some velcro tape for now at least. It wobbles a bit but it's not going anywhere.


Real-time voltage monitoring.


Inside the box.
Link Posted: 7/28/2018 11:48:00 AM EDT
I found my old project in the bottom of a box and decided to rebuild it with a nice housing.  I modeled everything in the computer and designed a lens adapter to 3d print.  Next I'm going to design a sleek battery compartment.Attachment Attached File
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Link Posted: 7/30/2018 8:27:44 PM EDT
[Last Edit: 7/30/2018 8:35:13 PM EDT by RaptorFuel]
I made a phone adapter from some scrap kydex.

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Link Posted: 8/21/2018 4:54:22 PM EDT
^ man, thats pretty cool.
Link Posted: 9/28/2018 12:09:59 AM EDT
They help me figure out where to buy the P8079HP or P8079

I searched and I can not find it u.u
Link Posted: 10/13/2018 1:37:50 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By urbansee:
They help me figure out where to buy the P8079HP or P8079

I searched and I can not find it u.u
View Quote
Pretty sure this is where we bought them. Been awhile.
Link Posted: 10/13/2018 1:44:48 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By RaptorFuel:
I found my old project in the bottom of a box and decided to rebuild it with a nice housing.  I modeled everything in the computer and designed a lens adapter to 3d print.  Next I'm going to design a sleek battery compartment.https://www.AR15.Com/media/mediaFiles/167432/E95B3B92-B6EF-43CF-BB4D-65A6FB447356-621821.JPGhttps://www.AR15.Com/media/mediaFiles/167432/A13D3F2A-AE90-48C7-8ADF-92DB09C32EF4-621822.JPGhttps://www.AR15.Com/media/mediaFiles/167432/C37196D2-4C39-4D95-924E-3B74124154A5-621824.JPGhttps://www.AR15.Com/media/mediaFiles/167432/A9331DB7-53EA-458E-8317-85177FBBFC51-621825.JPG
View Quote
Take a look back one page. We talked about using a flashlight for the battery pack. It's great and small.
Link Posted: 2/18/2019 12:55:12 AM EDT
[Last Edit: 2/18/2019 12:58:15 AM EDT by KeegsBruH413]
I'm pretty poor but I've always wanted a nv system of some kind and the original post here says that single stage gen1 tunes can be found as cheap as $10. I didn't find anything helpful after a quick search so does anyone know where I could purchase one? It doesn't necessarily have to be a single stage gen1 tube, just the absolute cheapest one I can get anywhere please. Quality isn't a big issue to me right now and if I need I can add extra ir light for it. I just need one I can afford
Link Posted: 3/5/2019 10:39:01 AM EDT
I admit, I didn't read the whole thread...has anyone done their own gen 3 PVS-15s?
Link Posted: 7/18/2019 12:43:37 PM EDT
Amazing thread! My girlfriend is away and i've got a week off so i've been reading this for days (and drinking lots of beer of course!).
Thanks David and everyone for sharing their experiences.
I'm limited to 2000 words as a new member posting so i've just deleted my long description and boiled it down to basics :
Grade A P8079HP from ebay, £185 including P&P.
2 lenses to try, one is a 50mm/1.4 with the M43 fitting, the other is a Praktica 50mm/1.8 with a proprietary mount i think, i managed to find a mounting ring for it too.
For the housing i bought 75mm PVC pipe, it's a perfect fit for the tube, being VERY tight.
I'll be using the 75mm endcaps in the pics, the hole i cut for the c-mount/M43 adapter ring is off-centre, but i knew i'd screw up so i ordered 4 to begin with.
I cut the housing pipe to a little longer than the length of the tube, including the input lens that protrudes ever so slightly from the assembly.
Pipe and end caps are a great solution if you want something modular, just have different endcaps with different adapter rings or whatever, i didn't do a very straight cut at the eyepiece end, but because i'm using endcaps it's not a problem.
I'm using 4 NimH batteries in series that provide 7.4 volts (the P8079HP has voltage regulation so this isn't an issue - as far as i know?). Does anyone have a link to the manual that someone posted a photo of pages 12-13 from, the manual from the company that made the tube, i've searched but can't find on the net ?

I won't have all the bits and pieces until next week, i'll update the thread as i go.

Cheers n Beers :)




Link Posted: 7/18/2019 12:48:24 PM EDT
This is the post with a pic of a couple of pages out of the manual, does anyone have a link to the manual ?

https://www.ar15.com/forums/Armory/DIY-Cascade-Tube-Thread-/18-359614/?page=14
Link Posted: 7/19/2019 12:14:47 PM EDT
I'll be sticking with the recommended voltage rather than going up to 7.4, even though i've read there's a regulater in the tube, a few of the bits arrived today so i'm ready to go using the small lens, still waiting for the ring adapter for the Praktica lens.

Will wait until it's darker and hook it up to a bench psu, plan to stick a raspberry pi at the eyepiece end to see what sort of image the pi camera gets, not sure what it's minimum focus is, would be nice to have the unit skywatching in the garden while i sit on my arse indoors remotely controlling it :)
Link Posted: 7/19/2019 3:43:46 PM EDT
[Last Edit: 7/22/2019 10:25:19 AM EDT by gclarke66]
Got a temporary assembly ready to test when it gets dark. The small lens, the NimH battery pack (which turned out to be 6.7v after resting - just right), a switch for safety.
For the negative i made a ground contact ring and pigtailed it through the housing. All a bit rough at the minute but good enough for testing.
For the positive i found a 2.5mm screw fits.

Photo of ground contact ring :



Whole assembly :

Link Posted: 7/22/2019 12:54:11 AM EDT
[Last Edit: 7/22/2019 12:55:22 AM EDT by hatti]
hello

here is link to few more pages of info about the tube
https://www.dropbox.com/sh/rnnkvasq5t6o2dy/AADmr9Ftu9FrdnRR2OohXQJpa?dl=0

yes,it is better not to exceed nominal voltage.

there are available adjustable voltage regulators,
one lithium ion cell with boost regulator would be nice option. EDIT: a lithium cell with over discharge protection.

good luck with your build!
Link Posted: 7/22/2019 6:47:21 AM EDT
Thanks hatti :)
Link Posted: 7/22/2019 10:18:18 AM EDT
[Last Edit: 7/27/2019 1:57:47 PM EDT by gclarke66]
The ground contact ring wasn't staying in place so i cut an acrylic ring to hold it :




I plan to use a raspberry pi with camera and motion-detection software :




A weather-proof container to hold it all in :



I'll be meteor-spotting at first :)
Link Posted: 7/22/2019 7:12:42 PM EDT
[Last Edit: 7/22/2019 7:18:55 PM EDT by gclarke66]
Turns out the camera can't focus on anything less than a few inches away so will have to adjust for distance between lens and screen or use a different camera.
Link Posted: 2/1/2020 11:28:49 AM EDT
HI,

WE are the company David Kitson mentioned as the supplier in the opening thread.. Down to a 1000 of these tubes. Price reduced to £150.00 around $195.00. If anyone would like a dealership to make really good money selling on ebay etc, let us know.

contact starlightnv@zen.co.uk
or julianmarsh3006@gmail.com
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