Barlow-ing the Lunt LS50Tha?

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Macavity
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Barlow-ing the Lunt LS50Tha?

Post by Macavity » Wed Mar 16, 2016 12:51 pm

Flushed with (relative) success re. my Lunt LS50THa,
I was wondering if it were possible to stretch things...

Or more specifically, does anyone have a functioning
Barlow method that works with the limited in-focus? :)

I got some sort of image with a budget Skywatcher
Barlow by detaching the front element and letting it
drop within the default eyepiece holder. But...

Anyone have a nicer solution? A standard Barlow?
A Baader (I like their eyepieces) Barlow? Teleview
PowerMate 2.5x? How far could you push things? ;)

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marktownley
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Re: Barlow-ing the Lunt LS50Tha?

Post by marktownley » Wed Mar 16, 2016 8:12 pm

Try using the skywatcher barlow by unscrewing the nosepiece and screwing it to the front of the blocking filter. I reckon you'll have newtons rings with the TV 2.5x, they're not the best for solar.
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grimble_cornet
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Re: Barlow-ing the Lunt LS50Tha?

Post by grimble_cornet » Thu Mar 17, 2016 1:07 am

Agree with Mark; the TV x2.5 Powermate is a wonderful bit of kit for planetary imaging but has a very bad reputation for creating Newton's rings when used for Ha. Not sure what camera you are using? My PG Grasshopper is totally immune to NRs (the main reason I bought it) but my DMKs and ZWOs were pretty much un-usable with the Powermate.
My 'cheapo' Skywatcher can have its from element un-screwed - I can then screw it to the nose of my camera and get good results.
I would have thought that using a Barlow would reduce the limited in-focus problem?
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Macavity
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Re: Barlow-ing the Lunt LS50Tha?

Post by Macavity » Fri Mar 18, 2016 9:30 am

Thanks guys - Something to save me money is always good! :lol:
I might explore the Telecentric possibilities for other stuff...

Re. Cams, I am using a ZWO120MM. Unfortunately specifically
with the Lunt LS50THa "backend", mounting the SW Barlow
element before the diagonal just don't work...

It works fine in a conventionally focussed refractor. You can
get limited magnification by "floating" it between Lunt diag
and the cam. But, with focal length approx. (minus) 75mm
there isn't a solution! But then I stated thinking a bit... :roll:

Using 2x Barlows screwed directly onto eyepieces to give
1.5x is a useful dodge. No detailed calculation, but there
exist cheapish 5x Barlows of "standard" size! If they have
a facilty to unscrew the front element, maybe by analogy...

But I'll let you know (collectively) if this works! :D

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