Lunt CaK diagonal modded to straight through

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bart1805
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Lunt CaK diagonal modded to straight through

Post by bart1805 » Thu Jan 24, 2019 6:46 pm

In an earlier thread I showed how I took apart my Lunt CaK diagonal: viewtopic.php?f=9&t=25213
But until now I was not able to modify it into a straight through variant. That way it would be easier to test the triple stack, so two PST #1 filters and the Lunt B600.
Today I managed to finish it. Here are the different components:

Image20190124_191604_resized_1 by bart moors, on Flickr

From left to right:
- the original 2 inch Lunt nosepiece including the filters.
- T2 adapter
- M48 T2 adapter
- 15 mm T2 extension
- 2 inch extension piece
- The B600 in the original housing from the diagonal
- 1,25 inch Baader Clicklock (which also has a T2 thread)

And here it is in one piece:

Image20190124_190819_resized_1 by bart moors, on Flickr

One other advantage is that the nose piece is higher in the light cone, so less stress for the 2 filters in there. Quite curious to compare these filters with the filters I use as an Erf in the PST CaK mod: Baader Blue and K-line.

CS! Bart.

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Re: Lunt CaK diagonal modded to straight through

Post by marktownley » Thu Jan 24, 2019 6:51 pm

Very interesting to see how you get along with it Bart.
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Re: Lunt CaK diagonal modded to straight through

Post by Bob Yoesle » Fri Jan 25, 2019 5:15 am

Very cool Bart.

I'm looking at a total redesign of my CaK module, but hitting a roadblock with filter mounting implementation with some ability to tilt multiple individual filters fairly close together.

I found this nifty tilt adapter which seems like it would be perfect, but it says "not in stock," and I received no reply to an email inquiry about future availability.

http://astrograph.net/epages/www_astrog ... GT2125TILT

Since I'm not in the UK, I didn't try and call them... Anyone able to check with them and let me know what you find out - it would be much appreciated. Does anyone know of another vendor?
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bart1805
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Re: Lunt CaK diagonal modded to straight through

Post by bart1805 » Fri Jan 25, 2019 8:22 am

Thanks Bob. I am not in the UK unfortunately, here is what I know/think.
Astrograph is Rupert's business, sometimes active on this forum. And a pleasure to deal with, reaction can take some time when he is abroad.
It seems like a unique piece, never seen it before, nice and simple design. It looks a bit like an ultrashort Skybender and I would not be surprised if this one was made by AOK (Beat).

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Re: Lunt CaK diagonal modded to straight through

Post by marktownley » Fri Jan 25, 2019 11:34 am

I'm fairly certain that's a Baader part, i'm sure i've seen it on their website...
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Re: Lunt CaK diagonal modded to straight through

Post by Bob Yoesle » Fri Jan 25, 2019 4:32 pm

Thanks guys, I guess I'll give a little more time for a response, and then try again.

Mark, it sure looks like a Baader T2 device, but I looked at their site and didn't find this particular implementation. So I'm hoping to hear back from Astrograph... Seems like it would be ideal for a modular system using multiple filter choices with the Baader TZ3 I just acquired.

Thanks again guys.
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Re: Lunt CaK diagonal modded to straight through

Post by bart1805 » Fri Jan 25, 2019 4:59 pm

Now I took a closer look, I second that it surely looks Baaderish.... Can't find it on their site either. But I found this: https://www.aanda.org/articles/aa/pdf/2 ... 305-11.pdf
Something foor the cloudy weekend.

bart1805
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Re: Lunt CaK diagonal modded to straight through

Post by bart1805 » Wed Feb 06, 2019 4:22 pm

Gerd Neumann confirmed it is indeed an old Baader part.

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