Lunt PT mod- vibration dampening

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Anthony M
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Lunt PT mod- vibration dampening

Post by Anthony M » Thu Feb 09, 2017 1:28 am

Hello, New to A-Hydrogen viewing and imaging with a Lunt 50mm/BF600. I am trying to record video for stacking and find adjustments to the PT'r to be difficult without bumping the scope too much. I've seen the remote tuner sold by Lunt and would rather save some honey for a stacking filter rather than for a electronic tuner. Has anyone thought about removing the manual tuner from the scope body and simply putting a high pressure pneumatic hose between the manual PT and the scope? It would be like using a shutter release cable on a camera for long exposures- nearly vibration free. Any references to others doing it would be highly appreciated! :). Thanks!!!

-Anthony

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Re: Lunt PT mod- vibration dampening

Post by soulvagabond » Thu Feb 09, 2017 9:32 pm

Can certainly be done.
Lunt doesn't need that much pressure, there was info posted somewhere, around (if I remember correctly) 20psi all it needs. A bottle of coke has more pressure than that.
There's a thread, where someone modifies an etalon to a vacuum tuned, but, an expensive precision pump was used:
viewtopic.php?f=10&t=15443
The logic,I assume is similar.

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Re: Lunt PT mod- vibration dampening

Post by MapleRidge » Mon Feb 13, 2017 4:08 am

Hi Anthony...

If you can engineer an adapter to mate the tuner to an air compressor you could make your own version of the Lunt remote tuner. I have the Lunt unit and it runs form 0 to 25PSI (for reference).

Brian
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Anthony M
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Re: Lunt PT mod- vibration dampening

Post by Anthony M » Mon Feb 13, 2017 5:32 am

Hello,

Thanks for your replies. I am certainly going to look further into this mod. My idea was to see if it was possible to remove the existing pressure tuner from the OTA body and put a hose between them, but I don't know if it can be easily done. Seems like a separate compressor will have to be a very precise one, thus expensive at that. I also just bought a sturdier mount that should help a bit more (an ES Twilight i) and put my camera tripod away for now. Thanks for your input!

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Re: Lunt PT mod- vibration dampening

Post by soulvagabond » Tue Feb 14, 2017 5:30 am

Mechanical pump of some sort, is probaly a better solution after all.
No need for the power, no noise.
Just need to find a portable one of a good precision and not overly expensive

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Re: Lunt PT mod- vibration dampening

Post by Anthony M » Wed Feb 15, 2017 3:22 am

Note: I'm now investigating a manual "pressure calibration" pump to do this, they appear to have very sensitive pressure regulation that a PT would require for micro adjustments... I will update this when I get results either way.

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