Help with lunt 50Ha imaging

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Torchwood1
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Help with lunt 50Ha imaging

Post by Torchwood1 » Thu May 18, 2017 10:28 pm

Hello guys ftp here, I am trying to achieve focus with my celestron skyris & neximage no go on either, I'm guessing back focus is out? Can someone point me in the right direction on adapters,tips,tricks etc? Lunt 50mm ha,pt,single stack,b400 block. I'm just using the standard 1.25 barrel on the cam BF is 19mm . Thank You. :bow

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Montana
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Re: Help with lunt 50Ha imaging

Post by Montana » Fri May 19, 2017 4:26 pm

I think I have heard from others (no expert here as I don't own one) that you have to draw out the diagonal a bit further - don't have it all the way in.

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Re: Help with lunt 50Ha imaging

Post by Brendan » Fri May 19, 2017 5:39 pm

The problem is in-focus I overcame this problem with the 50Ha by getting a shorter eyepiece holder http://astrograph.net/epages/www_astrog ... GTST2TO125
I also removed the barrel off the camera and have no problems now, the only other way is to use a barlow but you won't get a full disc image. I have the B600 but I don't think this should make too much difference.
Hope this helps
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Torchwood1
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Re: Help with lunt 50Ha imaging

Post by Torchwood1 » Fri May 19, 2017 10:37 pm

Modding up an extra lestron tube to shorten it up a bit, waiting on a short c adapter and feather touch to replace the silly [hot place]-a-crap to arrive. Thank You for the guidance!
Good seeing

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Re: Help with lunt 50Ha imaging

Post by marktownley » Sat May 20, 2017 6:07 am

let us know how you get on.
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Re: Help with lunt 50Ha imaging

Post by amendola » Fri May 26, 2017 8:41 pm

I wasn't able to get my camera to focus (sony a6000) even with a shorter eyepiece holder. I ended up getting a 2x televue barlow, and now I can focus without any problem.

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Re: Help with lunt 50Ha imaging

Post by Giorgio_ne » Tue Jun 06, 2017 10:08 pm

Hi Guys, first time post for me here too.

I'm also unable to reach focus on my LS50 B600 and Skyris 445 or PTG chameleon. I've replaced the stock focuser with a Feather Touch, the issue seems to be with in-focus. I bought a shorter eyepiece holder identical to this one:
http://astrograph.net/epages/www_astrog ... GTST2TO125
but I'm unable to screw it on the B600! It seems the thread on the eyepiece side of the diagonal is different from the thread on the focuser side.
The thread on the focuser side seems to be a T2 (the new eyepiece holder screws in perfectly) but no idea what's on the eyepiece side. I even tried a an M42 adapter but it does not fit either... It is very frustrating.

Can anyone please advise?

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Re: Help with lunt 50Ha imaging

Post by solarchat » Wed Jun 07, 2017 12:49 am

just like the PST, The LS50 is NOT designed for imaging. That being said, both of these scopes can be focused with a camera and a barlow lens.
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Re: Help with lunt 50Ha imaging

Post by Astrograph » Thu Jun 08, 2017 3:00 pm

Hi Guys,
We have tested the Lunt50 B600 for imaging WITHOUT a barlow so we can advise customers on what to do. Using a PGR camera with C mount (17.5mm back focus), it is possible to reach focus using a C to T2 adapter and a 5mm T2 extension. This screws directly onto the diagonal when the standard, and quite long, 1.25" clamp is removed. I did try many combinations but back focus is tight. Sun is forecast over the next couple of days so I will confirm all the parts needed again but 99% sure it was just a 5mm and the adapter. I will post an image from the first test later as I have not processed it yet!

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