PST + DSLR Full disk problem ... AMENDED
Posted: Thu Feb 28, 2019 10:24 am
AMENDED sizes - Barlow tip is 15mm, not 22mm !
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Hi all
[please remember I am not expert!]
I managed to get a second or third hand PST and I have fixed the play with the tuner by simply adjusting the fitting screw onto the 3rd threaded hole and play is almost zero - even if I have the O-rings, I am not replacing them just yet and I am waiting for a new ITF, as old one has a ring on it!
I also tightened the focuser and shift is a lot less, but for one point where it shifts a lot - will see about that another time!
I managed to take my first image [well 4 images, but processed one only] - I do not have it here and will show it soon.
You can see it here: https://astronomo.space/my-images/the-sun/
I did some testing with Altair 178M, the old ToU cam and they both seem to work decently using only a 15mm 2x Barlow tip onto the cameras nosepiece - I will shorten it a bit too to see if it improves - it should.
I then tried my Canon 100D [modified] and could not get focus - I have read quite a few posts everywhere about it - still cannot solve.
Tried:
- 10mm EOS/T2 + standard nosepiece [22mm] + 15mm 2x Barlow tip - total gap is 37mm, why did not focus?
- 1mm EOS/M42 [not T2 therefore it had a gap of about 4mm] + standard nosepiece [22mm] + 15mm 2x Barlow tip
- 10mm EOS/M48 + M48/1.25" adaptor + 15mm 2x Barlow tip
- Seben Zoom 8-24mm and at around 16-18mm was the best I could go
With/without a IR/UV filter too - to try and less interference.
I do not remember which one was better, but I never saw any surface feature and when overexposed to see Prominences, I did see a couple and I barely managed to get something out with any other above configurations.
I might have tried other configurations, not sure really, as I was getting fed up with it - mainly for the awkward position I have to use my EQ6!
I have got the impression that I need to get DSLR nearer to the nosepiece receptacle and I have also read somewhere, Coronado/Meade did fit two different ones - different by 5mm? Am I wrong? Mine, the nosepiece receptacle is about 30mm and its holder is about the same 30mm, just so you have more info.
What I have not tried yet:
- Meade shorty mod
- Eyepiece Projection should work, I think! I have to find the adaptor.
- ?
Any help guys?
See images of adaptations I used.
IF other things come to mind I will post them.
Thank you in advance for your expertise and help.
M
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ADDITION - amended Barlow tip size from 22mm to 15mm
Therefore with this setting:
10mm EOS/T2 + standard nosepiece [22mm] + 15mm 2x Barlow tip - I had a total of 37mm
I mixed up sizes, but I actually got it right the first time with 37mm, but being my PST 'eyepiece holder' 30mm and not 35mm, I will have to take 7mm off and hopefully work and get down to 30mm.
Going to make it today and hopefully I should get a couple of hours of Sun on Sunday - I mean SUN ... Day - one can hope!
##########################################################
------------------------------------------------------------
Hi all
[please remember I am not expert!]
I managed to get a second or third hand PST and I have fixed the play with the tuner by simply adjusting the fitting screw onto the 3rd threaded hole and play is almost zero - even if I have the O-rings, I am not replacing them just yet and I am waiting for a new ITF, as old one has a ring on it!
I also tightened the focuser and shift is a lot less, but for one point where it shifts a lot - will see about that another time!
I managed to take my first image [well 4 images, but processed one only] - I do not have it here and will show it soon.
You can see it here: https://astronomo.space/my-images/the-sun/
I did some testing with Altair 178M, the old ToU cam and they both seem to work decently using only a 15mm 2x Barlow tip onto the cameras nosepiece - I will shorten it a bit too to see if it improves - it should.
I then tried my Canon 100D [modified] and could not get focus - I have read quite a few posts everywhere about it - still cannot solve.
Tried:
- 10mm EOS/T2 + standard nosepiece [22mm] + 15mm 2x Barlow tip - total gap is 37mm, why did not focus?
- 1mm EOS/M42 [not T2 therefore it had a gap of about 4mm] + standard nosepiece [22mm] + 15mm 2x Barlow tip
- 10mm EOS/M48 + M48/1.25" adaptor + 15mm 2x Barlow tip
- Seben Zoom 8-24mm and at around 16-18mm was the best I could go
With/without a IR/UV filter too - to try and less interference.
I do not remember which one was better, but I never saw any surface feature and when overexposed to see Prominences, I did see a couple and I barely managed to get something out with any other above configurations.
I might have tried other configurations, not sure really, as I was getting fed up with it - mainly for the awkward position I have to use my EQ6!
I have got the impression that I need to get DSLR nearer to the nosepiece receptacle and I have also read somewhere, Coronado/Meade did fit two different ones - different by 5mm? Am I wrong? Mine, the nosepiece receptacle is about 30mm and its holder is about the same 30mm, just so you have more info.
What I have not tried yet:
- Meade shorty mod
- Eyepiece Projection should work, I think! I have to find the adaptor.
- ?
Any help guys?
See images of adaptations I used.
IF other things come to mind I will post them.
Thank you in advance for your expertise and help.
M
##########################################################
ADDITION - amended Barlow tip size from 22mm to 15mm
Therefore with this setting:
10mm EOS/T2 + standard nosepiece [22mm] + 15mm 2x Barlow tip - I had a total of 37mm
I mixed up sizes, but I actually got it right the first time with 37mm, but being my PST 'eyepiece holder' 30mm and not 35mm, I will have to take 7mm off and hopefully work and get down to 30mm.
Going to make it today and hopefully I should get a couple of hours of Sun on Sunday - I mean SUN ... Day - one can hope!
##########################################################