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Thread: Optical match for a Dob

  1. #11
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    Default Re: Optical match for a Dob



    Well, that changes things a lot. But I think there might be an issue or two with applying that equation and expecting to get the scales you want. That problem rests in the 2" draw tube. A 41mm Pan and a 55mm Plossl are limited in TFOV by the draw tube. It's that piece of hardware that limits the TFOV, eyepiece be damned.
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  2. #12
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    Default Re: Optical match for a Dob

    Let's know how you get on. Apparently the NV equipment is a state secret, and we non-US plebs aren't even allowed to look through a NV eyepiece: US citizens only!

    - Dean

  3. #13
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    Default Re: Optical match for a Dob

    hmmmm ..... there are non-US astronomers whoa re using NV - Down Under being a friendly country and all I thought there is some of this tech available to you. If you head on over to CN and make a quick post in the 'EAA Observation & equipment" subforum you'll bget a quick answer as to what's available & from whom ...

    My cunning plan is to rent an NV device, probably to line up with a big KSC party my club is supporting and check out all the claims for myself. Within the small 'secret society' doing this the general consensus is that all things being equal, NV effectively almost doubles your scope aperture It's basically useless for bright objects like lunar & planetary but for DSOs, especially in conjunction with an appropriate filter the results appear to be nothing short of amazing - and this is reported from light polluted skies - had to a dark sight and things jump again.

    The cost is the thing most often sighted as a barrier but the folks who are really into this have also sold off most of their EPs & even a scope or 2 since they don't need them anymore & funded the NV that way. When I look at some folks signatures here they easily have 2 or 3 NV devices worth of equipment ... lol.

    Not trying to sell anyone on this but for me if I could just observe from my backyard without ever needing to go to a dark site to see 'more'' (other than attending events), that is worth every penny of the device ... we'll see how 'impressed' I am with the rental ...
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  4. #14
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    Default Re: Optical match for a Dob

    Quote Originally Posted by Nimitz View Post
    hmmmm ..... there are non-US astronomers whoa re using NV - Down Under being a friendly country and all I thought there is some of this tech available to you. If you head on over to CN and make a quick post in the 'EAA Observation & equipment" subforum you'll bget a quick answer as to what's available & from whom ...

    My cunning plan is to rent an NV device, probably to line up with a big KSC party my club is supporting and check out all the claims for myself. Within the small 'secret society' doing this the general consensus is that all things being equal, NV effectively almost doubles your scope aperture It's basically useless for bright objects like lunar & planetary but for DSOs, especially in conjunction with an appropriate filter the results appear to be nothing short of amazing - and this is reported from light polluted skies - had to a dark sight and things jump again.

    The cost is the thing most often sighted as a barrier but the folks who are really into this have also sold off most of their EPs & even a scope or 2 since they don't need them anymore & funded the NV that way. When I look at some folks signatures here they easily have 2 or 3 NV devices worth of equipment ... lol.

    Not trying to sell anyone on this but for me if I could just observe from my backyard without ever needing to go to a dark site to see 'more'' (other than attending events), that is worth every penny of the device ... we'll see how 'impressed' I am with the rental ...
    I guess it depends on what system you use, but the latest 3rd-gen from TNVC and Televue, as reviewed in the June 2018 Sky and Telescope magazine, has severe restrictions on its use. You can't export it without a special licence (so maybe to "nice" countries like Oz! ), and you can't even allow non-US citizens to look through one. And don't even think about taking one with you if you are travelling! See: https://tnvc.com/faq/

    We have some interesting restrictions here in Oz too: green-light lasers are classed as weapons, and you are required to register them in most States...

    Good luck with your rental: I hope it goes really well.

    - Dean

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  5. #15
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    Default Re: Optical match for a Dob

    Well that is certainly somewhat unfriendly of us ... You could always apply to become a US citizen ...

    One of the first posts I read said that if you have ready access to dark skies at altitude then NV just seems like some expensive silly game so maybe where you are in Oz you don't even need to bother ....
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  6. #16
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    Default Re: Optical match for a Dob

    One of the big proponents of NV astronomy says he lives 3 miles from downtown Austin and with his NV setup he describes the Milky Way with details I've only heard from those in the middle of New Mexico 200 miles from Albuquerque. Having actually lived in that part of the county for a couple of years and remembering what he night sky looked like traveling between Roswell and Albuquerque that got my attention in a hurry ....
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  7. #17
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    Default Re: Optical match for a Dob

    Quote Originally Posted by Nimitz View Post
    Well that is certainly somewhat unfriendly of us ... You could always apply to become a US citizen ...

    One of the first posts I read said that if you have ready access to dark skies at altitude then NV just seems like some expensive silly game so maybe where you are in Oz you don't even need to bother ....
    It would be nice to play with, but I think it would take more than a desire for NV gear to want to become a US citizen... I already live in the greatest country on Earth! (not that I'm biased though).

    We certainly have some nice dark skies in the Outback (the best SQM reading I have taken at one of our dark sky camps was 22.1 ("Bortle" 0 ?) - and you can always tell when it drops to only 21.6 (Bortle 2) because it seems a bit bright ...): and the Milky Way is directly overhead at the moment, and casts a shadow (you can't get that with NV equipment!). On one camp one of my comet-hunting friends was even heard to complain because the gegenschein was too bright and it was mucking up his search for faint fuzzies... (although I think that is just a tad extreme!).
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    Default Re: Optical match for a Dob

    Political discussion removed. Thread closed.
    Last edited by KathyNS; 06-18-2018 at 08:39 PM.

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  9. The Following 4 Users Say Thank You to KathyNS For This Useful Post:

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