Ha PST mod. Need your help.
- Valery
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Ha PST mod. Need your help.
Hi modders,
Today I get a very old PST Ha for modding (for my friend's 100mm F/10 refractor).
I tried to test the PST as is, but the sun looks red-orange and featureless. I saw only a one single sun spot like in white light. So, no Ha details at all.
The sun also looks dim.
What I see:
1. The objective has light blue reflection but also a brown color back side and this looks totally rusted.
2. The blocking filter (5mm) is not really red if to look through - more like orangish-yellowish with some greenish.
3. Pentaprism is yellowish if to look through.
But this is not the problem. The problem, and I need your advice, is that I can't unscrew the gold tube from the etalon body.
Anybody already solved such a problem and if yes, what your advice how to do this right without lenses and etalon damage?
Any link with pictures?
Thanks in advance.
Valery.
Today I get a very old PST Ha for modding (for my friend's 100mm F/10 refractor).
I tried to test the PST as is, but the sun looks red-orange and featureless. I saw only a one single sun spot like in white light. So, no Ha details at all.
The sun also looks dim.
What I see:
1. The objective has light blue reflection but also a brown color back side and this looks totally rusted.
2. The blocking filter (5mm) is not really red if to look through - more like orangish-yellowish with some greenish.
3. Pentaprism is yellowish if to look through.
But this is not the problem. The problem, and I need your advice, is that I can't unscrew the gold tube from the etalon body.
Anybody already solved such a problem and if yes, what your advice how to do this right without lenses and etalon damage?
Any link with pictures?
Thanks in advance.
Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- Ibbo
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Re: Ha PST mod. Need your help.
I got mine off using these
http://www.amazon.co.uk/BOA-Constrictor ... boa+wrench
http://www.amazon.co.uk/BOA-Constrictor ... boa+wrench
- Valery
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Re: Ha PST mod. Need your help.
Thanks a lot!Ibbo wrote:I got mine off using these
http://www.amazon.co.uk/BOA-Constrictor ... boa+wrench
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- Ibbo
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Re: Ha PST mod. Need your help.
I forgot to mention I used 2 and it involved lots of swearing as well:D
- swisswalter
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Re: Ha PST mod. Need your help.
Hi Valery
next to the wrench soak for at leaast 24 hours with kreeping oil and / or a good solvent like butylacetate
next to the wrench soak for at leaast 24 hours with kreeping oil and / or a good solvent like butylacetate
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
Re: Ha PST mod. Need your help.
I found that after failing by applying constant pressure I succeeded by applying a sudden jolt. Not by hitting it but by just suddenly aaplying the pressure. It did take a couple of tries though.
ian
ian
- Valery
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Re: Ha PST mod. Need your help.
The problem is solved. The etalon block has been removed successfully.
Will need to make some adapters for making Mod stage 2 with 100mm F/10 refractor.
Hope that my friend will be happy with this mod 2.
Thanks to all.
Valery.
Will need to make some adapters for making Mod stage 2 with 100mm F/10 refractor.
Hope that my friend will be happy with this mod 2.
Thanks to all.
Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- Valery
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Re: Ha PST mod. Need your help.
After I removed the etalon from the PST, I have spent some time for making the extention tube.
So, the black box now rests somewhere in a dust. I do use my Coronado BF10 as the blocking filter.
So, the black box now rests somewhere in a dust. I do use my Coronado BF10 as the blocking filter.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- swisswalter
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Re: Ha PST mod. Need your help.
Hi VAlery
you did not tell us what the solution was to unscrew the PST Etalon
you did not tell us what the solution was to unscrew the PST Etalon
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
- Valery
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Re: Ha PST mod. Need your help.
1. Use a vise engineswisswalter wrote:Hi VAlery
you did not tell us what the solution was to unscrew the PST Etalon
2. Clamp an old drive belt (from a car motor) in the vise
3. Put the etalon body in the loop of the belt and clump all very firmly.
4. Rotate the telescope tube counter-clockwise with some fair force - it unscrew then.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
- swisswalter
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Re: Ha PST mod. Need your help.
Oh I see Valery. Thank you
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa