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 »

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 »

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 »

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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Re: Lunt CaK diagonal modded to straight through

Post by bart1805 »

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 »

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 »

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 »

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.


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Re: Lunt CaK diagonal modded to straight through

Post by bart1805 »

Gerd Neumann confirmed it is indeed an old Baader part.


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Re: Lunt CaK diagonal modded to straight through

Post by hopskipson »

I just saw this thread. I’m interested in double stacking the Lunt Calcium filters. So from the pictures it looks like the filter is in the nose piece of the diagonal and the blocking filter is in the eyepiece holder , am I correct? Is there a way to stack 2 nose pieces together or do I need to do something else? Has anyone tried to double stack these filters? Before I start taking anything apart it would be nice to know. Thanks


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Re: Lunt CaK diagonal modded to straight through

Post by Bob Yoesle »

The larger "nosepiece" filters are ERF's, the smaller filter in the eyepiece holder is the narrow transmission CaK filter. So you would only need one of the "nosepiece filter" assemblies and two of the eyepiece holder filters in order to double stack the Lunt CaK modules.

Lots of people have successfully double stacked these type of filters.


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