Dismantling and modification of a PST CaK
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Dismantling and modification of a PST CaK
Here is the story of dismantling a PST CaK. In the end, the plan is to start spring with a doublestacked CaK filter.
1. The original PST CaK
20181012_183558_resized_1 by bart moors, on Flickr
2. Problem number 1, destroyed one of the screws, so had to drill it out.
20181012_184327_resized_1 by bart moors, on Flickr
3. The inside of the PsT CaK
20181013_113749_resized_1 by bart moors, on Flickr
It looks exactly the same as a "normal" PST
20181013_113909_resized_1 by bart moors, on Flickr
Two other pictures of the inside of the PST, first one from the front, seconde one from the top (right side points to the frontlens).
20181013_121223_resized_1 by bart moors, on Flickr
20181013_121239_resized_1 by bart moors, on Flickr
Here you can see the retaining ring that holds the cell the #2 filter is placed in.
20181013_113827_resized_1 by bart moors, on Flickr
4. The #2 filter
It is quite easy to release the filter cell, just by turning the retaining ring. Use a screwdriver (gently) and it pops out.
20181013_114905_resized_1 by bart moors, on Flickr
Yes it is damaged.
20181013_115114_resized_1 by bart moors, on Flickr
And consists of two pieces.
20181013_115039_resized_1 by bart moors, on Flickr
5. The front lens
With a lens spanner it is east to pop the front lens out.
20181013_114121_resized_1 by bart moors, on Flickr
And here it is, lying on the retainer ring.
20181013_115630_resized_1 by bart moors, on Flickr
6. You can see the #1 filter and the retaining ring.
20181013_115716_resized_1 by bart moors, on Flickr
Could reach the retaining ring, but could not move it. So that is it for now, winter is still long. Will try again to remove the tube the way it is supposed. But otherwise will drill two holes in it and use a metal rod to twist everything.
If anybody needs other pictures, please let me know, it is all lying around here.
CS! Bart.
1. The original PST CaK
20181012_183558_resized_1 by bart moors, on Flickr
2. Problem number 1, destroyed one of the screws, so had to drill it out.
20181012_184327_resized_1 by bart moors, on Flickr
3. The inside of the PsT CaK
20181013_113749_resized_1 by bart moors, on Flickr
It looks exactly the same as a "normal" PST
20181013_113909_resized_1 by bart moors, on Flickr
Two other pictures of the inside of the PST, first one from the front, seconde one from the top (right side points to the frontlens).
20181013_121223_resized_1 by bart moors, on Flickr
20181013_121239_resized_1 by bart moors, on Flickr
Here you can see the retaining ring that holds the cell the #2 filter is placed in.
20181013_113827_resized_1 by bart moors, on Flickr
4. The #2 filter
It is quite easy to release the filter cell, just by turning the retaining ring. Use a screwdriver (gently) and it pops out.
20181013_114905_resized_1 by bart moors, on Flickr
Yes it is damaged.
20181013_115114_resized_1 by bart moors, on Flickr
And consists of two pieces.
20181013_115039_resized_1 by bart moors, on Flickr
5. The front lens
With a lens spanner it is east to pop the front lens out.
20181013_114121_resized_1 by bart moors, on Flickr
And here it is, lying on the retainer ring.
20181013_115630_resized_1 by bart moors, on Flickr
6. You can see the #1 filter and the retaining ring.
20181013_115716_resized_1 by bart moors, on Flickr
Could reach the retaining ring, but could not move it. So that is it for now, winter is still long. Will try again to remove the tube the way it is supposed. But otherwise will drill two holes in it and use a metal rod to twist everything.
If anybody needs other pictures, please let me know, it is all lying around here.
CS! Bart.
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Re: Dismantling and modification of a PST CaK
Thanks a lot Bart !!
Christian Viladrich
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Re: Dismantling and modification of a PST CaK
Just wondering whether you could apply some heat arround filter n1 ? Maybe there is some glue ?
Christian Viladrich
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Re: Dismantling and modification of a PST CaK
Yes, that is another possibility, can't see the glue if I look in the tube, but most of the times it is somehow glued. Have got another gold tube of a PST lying around here, will check later if they are the same size. If so, even destroying one of them means I can still rebuild the CaK to it's original state.christian viladrich wrote: ↑Sat Oct 13, 2018 12:21 pm Just wondering whether you could apply some heat arround filter n1 ? Maybe there is some glue ?
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Re: Dismantling and modification of a PST CaK
I know Apollo, and I have tried it with a strap wrench. Have freed 2 PST etalons with it without major problems, but this one hates to be liberated.
Here is the last light of the PST CaK. Could not get into focus, so removed the upper part of the eyepiece holder. Asi290mm with a single Baader CaK filter.
Sun_10121243161_PSTCaK_BaaderCaKsingle by bart moors, on Flickr
Here is the last light of the PST CaK. Could not get into focus, so removed the upper part of the eyepiece holder. Asi290mm with a single Baader CaK filter.
Sun_10121243161_PSTCaK_BaaderCaKsingle by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
Thanks Bart
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Re: Dismantling and modification of a PST CaK
So, finally there are two filters :
- Number 2 at the rear. Actually it consists in two parts (glued ?).
- Number one at the front (behind the lens ?), this one is a GG395 according to the information given by Apollo.
Is this correct ?
No filter at the front of the eyepice ?
BTW, the lens seems to be a doublet ?
Christian
- Number 2 at the rear. Actually it consists in two parts (glued ?).
- Number one at the front (behind the lens ?), this one is a GG395 according to the information given by Apollo.
Is this correct ?
No filter at the front of the eyepice ?
BTW, the lens seems to be a doublet ?
Christian
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
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http://planetary-astronomy.com/
Editor of "Solar Astronomy"
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Re: Dismantling and modification of a PST CaK
Yes, the lens is a doublet Christian
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Re: Dismantling and modification of a PST CaK
Free at last!
Good day today. First tried to dismantle the Lunt B600 diagonal.
With a lens spanner it is really easy to twist the retaining ring of the BF:
20181014_141955_resized by bart moors, on Flickr
And there lies the square Lunt Blocking filter:
20181014_142039_resized by bart moors, on Flickr
Loosen the two screws on the diagonal and torch it a bit. Then the cell comes out, here you see it upside down. Look at the amount of glue that was used.
20181014_153708_resized by bart moors, on Flickr
It is just glued on the diagonal, the two screws are extra. So no thread:
20181014_152027_resized by bart moors, on Flickr
And after this used the Ruler-method to twist the retaining ring of the #1 PST CaK filter. If you have a good grip, it is really easy. That is it for today: a free Coronado and a free Lunt CaK filter. The #1 filter was lightly glued to the retaining ring, you can see the residu.
20181014_151818_resized by bart moors, on Flickr
Good day today. First tried to dismantle the Lunt B600 diagonal.
With a lens spanner it is really easy to twist the retaining ring of the BF:
20181014_141955_resized by bart moors, on Flickr
And there lies the square Lunt Blocking filter:
20181014_142039_resized by bart moors, on Flickr
Loosen the two screws on the diagonal and torch it a bit. Then the cell comes out, here you see it upside down. Look at the amount of glue that was used.
20181014_153708_resized by bart moors, on Flickr
It is just glued on the diagonal, the two screws are extra. So no thread:
20181014_152027_resized by bart moors, on Flickr
And after this used the Ruler-method to twist the retaining ring of the #1 PST CaK filter. If you have a good grip, it is really easy. That is it for today: a free Coronado and a free Lunt CaK filter. The #1 filter was lightly glued to the retaining ring, you can see the residu.
20181014_151818_resized by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
Here you can see that the Lunt filter consists of two pieces:
20181014_190801_resized by bart moors, on Flickr
20181014_190801_resized by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
250 dollar for that 40 mm objective lens? That is quite a lot, did not know that. Have two of them, so maybe I will make a UV optimised bino with them. (-;
I found it typical that the #1 filter is glued to the retaining ring where the #2 filter is not. Any particular reason you know of?
I found it typical that the #1 filter is glued to the retaining ring where the #2 filter is not. Any particular reason you know of?
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Re: Dismantling and modification of a PST CaK
Even after applying some heat on the blue collar of the PST CaK I could not remove it from the black box. So removed the lens and put it in a gold tube of a H-alpha PST. The difference in coatings is clearly visible. On the left the CaK objective.
20181021_114011_resized by bart moors, on Flickr
So now I have got clouds and and ready to go 40mm CaK telescope. From left to right after the gold tube:
- Adapter made by AOK
- JMI EV focuser
- Baader 2 inch clicklock
- 1,25 inch Skybender
- ASI 290mm
20181021_120317_resized by bart moors, on Flickr
20181021_120334_resized by bart moors, on Flickr
20181021_114011_resized by bart moors, on Flickr
So now I have got clouds and and ready to go 40mm CaK telescope. From left to right after the gold tube:
- Adapter made by AOK
- JMI EV focuser
- Baader 2 inch clicklock
- 1,25 inch Skybender
- ASI 290mm
20181021_120317_resized by bart moors, on Flickr
20181021_120334_resized by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
I replaced the objective in my sm40 for one from a Cak PST too
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Re: Dismantling and modification of a PST CaK
Yep, that looks good. But with the ruler method it is not really necessary to remove the tube. But would be handy for a regular PST. Thanks!TheSkyBurner wrote: ↑Thu Oct 25, 2018 6:18 am so i figured out the best way to remove a locked pst tube.
You need to find a pipe vice.
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Re: Dismantling and modification of a PST CaK
The second PST CaK will be here in about two weeks I think. Thanks to Apollo and Marty I found the right filter cell for the 25mm PST #1 filter.
Here is how it looks now:
CaKfilter_annotated by bart moors, on Flickr
The Lunt B600 can be replaced by the second PST #1 filter. And will have to experiment with one or two of the single Baader CaK filters. Etc.
And the PST CaK mod:
40mm_annotated by bart moors, on Flickr
Here is how it looks now:
CaKfilter_annotated by bart moors, on Flickr
The Lunt B600 can be replaced by the second PST #1 filter. And will have to experiment with one or two of the single Baader CaK filters. Etc.
And the PST CaK mod:
40mm_annotated by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
Nice creations Bart!
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Re: Dismantling and modification of a PST CaK
Thanks Mark. Tomorrow, if the weather permits, will test it with the Bresser 127mm f/10.
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Re: Dismantling and modification of a PST CaK
Maybe I will Apollo, but not before trying out all the different combinations I can come up with.TheSkyBurner wrote: ↑Sat Nov 03, 2018 7:27 pm You can totally eliminate that baader planetarium K-filter (i would resell it), put the pst filter in the tilter instead so you can take blue wing images with a couple twists..
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Re: Dismantling and modification of a PST CaK
A lot of high clouds today and the sun is quite low here in the Netherlands. But at least I could give it a try. Used a Bresser Messier 127mm f/1200 mm stopped down to 10 cm.
Set up used was Baader Blue / Single Baader CaK / PST CaK #1 / Baader Blue / LuntB600.
With just the PST #1 filter (so no Lunt) the image was better than with just the B600 (so no #1 PST). Image was best when used both the Lunt filter and the PST #1 filter. Sun was a bit boring, and you can see the vignetting caused by the small Lunt Filter. Camera used was the ASI290mm.
Sun_123501_alles43063_PS by bart moors, on Flickr
Still a lot of experimenting and trial and error to be done in the near future, but at least it has started!
Set up used was Baader Blue / Single Baader CaK / PST CaK #1 / Baader Blue / LuntB600.
With just the PST #1 filter (so no Lunt) the image was better than with just the B600 (so no #1 PST). Image was best when used both the Lunt filter and the PST #1 filter. Sun was a bit boring, and you can see the vignetting caused by the small Lunt Filter. Camera used was the ASI290mm.
Sun_123501_alles43063_PS by bart moors, on Flickr
Still a lot of experimenting and trial and error to be done in the near future, but at least it has started!
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Re: Dismantling and modification of a PST CaK
Good result. That 290 is on my shopping list for next year.
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Re: Dismantling and modification of a PST CaK
Received the second PST CaK today. Lower number: 50095. And I could screw the gold tube by hand of the blue ring. No force needed at all. Filter cell also unscrewed by hand, no force needed. Less glue was used to attach the filter to the retaining ring. So in about 3 minutes I had a second PST CaK #1 filter in a new cell. Doublestacking time!
20181116_104544_resized by bart moors, on Flickr
20181116_110410_resized by bart moors, on Flickr
20181116_104544_resized by bart moors, on Flickr
20181116_110410_resized by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
It is good when the PSTs just unscrew. I've had a few that have been able to just unscrew, but also a few that were stuck fast.
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Re: Dismantling and modification of a PST CaK
Could experiment this morning for about half an hour. The altitude of the sun was 15 degrees. And I really needed the Baader K-line, otherwise the image was washed out, looked a bit like continuum without the K-line. Maybe you can do without the Baader if you use a Chroma filter.TheSkyBurner wrote: ↑Sat Nov 03, 2018 7:27 pm You can totally eliminate that baader planetarium K-filter (i would resell it), put the pst filter in the tilter instead so you can take blue wing images with a couple twists..
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Re: Dismantling and modification of a PST CaK
Ready to go!
Found a secondhand Celestron 102 ED (f/9). Changed the original focuser for a Baader Steeltrack version.
Mounted inside are:
2 inch Baader Blue CCD
2 inch Beloptik UV/IRcut on KG3
Baader CaK filter (mounted the two original filters in two filter cells.
PST #1 filter on nosepiece of Skybender
PST #1 filter inside Skybender.
20181201_153405_resized by bart moors, on Flickr
Found a secondhand Celestron 102 ED (f/9). Changed the original focuser for a Baader Steeltrack version.
Mounted inside are:
2 inch Baader Blue CCD
2 inch Beloptik UV/IRcut on KG3
Baader CaK filter (mounted the two original filters in two filter cells.
PST #1 filter on nosepiece of Skybender
PST #1 filter inside Skybender.
20181201_153405_resized by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
Looks good Bart
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Re: Dismantling and modification of a PST CaK
Thanks Mark!
Painted the inside of the OTA with Berger Antireflexfarbe. The fight against reflections.....
Before and after picture:
20181202_110444_resized_1 by bart moors, on Flickr
20181202_152700_resized_1 by bart moors, on Flickr
Painted the inside of the OTA with Berger Antireflexfarbe. The fight against reflections.....
Before and after picture:
20181202_110444_resized_1 by bart moors, on Flickr
20181202_152700_resized_1 by bart moors, on Flickr
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Re: Dismantling and modification of a PST CaK
That is quite a difference! All these things that we do have a positively cumulative effect...
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Re: Dismantling and modification of a PST CaK
"Painted the inside of the OTA with Berger Antireflexfarbe."
Unfortunately, can't be delivered to the States. Anyone know of a similar product available in North America?
Unfortunately, can't be delivered to the States. Anyone know of a similar product available in North America?
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Re: Dismantling and modification of a PST CaK
Sorry Bob, can't help you with the paint. Is flocking paper an idea?Bob Yoesle wrote: ↑Mon Dec 03, 2018 5:40 pm "Painted the inside of the OTA with Berger Antireflexfarbe."
Unfortunately, can't be delivered to the States. Anyone know of a similar product available in North America?
Or ship your OTA to Europe, more than happy to paint it (the inside) for you.