PST + DSLR Full disk problem ... AMENDED

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
Post Reply
solarchatted
Oh, I get it now!
Oh, I get it now!
Posts: 26
Joined: Wed Mar 14, 2018 11:33 am
Location: Durham, UK
Contact:

PST + DSLR Full disk problem ... AMENDED

Post by solarchatted » Thu Feb 28, 2019 10:24 am

AMENDED sizes - Barlow tip is 15mm, not 22mm !
------------------------------------------------------------

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!

##########################################################
Attachments
CanonEOS_10mmT2_nosep_15mmx2.jpg
10mm EOS/T2 + standard nosepiece [long one!] + 15mm 2x Barlow tip
CanonEOS_10mmT2_nosep_15mmx2.jpg (134.52 KiB) Viewed 323 times
CanonEOS_1mmM48_48-125_15mmx2.jpg
10mm EOS/M48 + M48/1.25" adaptor + 15mm 2x Barlow tip
CanonEOS_1mmM48_48-125_15mmx2.jpg (83.18 KiB) Viewed 323 times
CanonEOS_1mmM42_nosep_15mmx2.jpg
1mm EOS/M42 [not T2] + standard nosepiece [long one!] + 15mm 2x Barlow tip
CanonEOS_1mmM42_nosep_15mmx2.jpg (121.59 KiB) Viewed 323 times
Last edited by solarchatted on Fri Mar 01, 2019 9:45 am, edited 1 time in total.
SolarChatted

bart1805
Im an EXPERT!
Im an EXPERT!
Posts: 486
Joined: Mon Feb 06, 2017 9:04 pm
Location: The Netherlands

Re: PST + DSLR Full disk problem ...

Post by bart1805 » Thu Feb 28, 2019 10:49 am

Hi M,
Maybe your expectations are a bit too high. There is nothing going on at the moment on the surface of the sun. So there is not a lot to image. This is the ideal period to try out different configurations while waiting for more activity.
Nice first picture! Way better than my first one. CS! Bart.

solarchatted
Oh, I get it now!
Oh, I get it now!
Posts: 26
Joined: Wed Mar 14, 2018 11:33 am
Location: Durham, UK
Contact:

Re: PST + DSLR Full disk problem ...

Post by solarchatted » Thu Feb 28, 2019 11:03 am

Hi Bart
Yes, I know it is quiet although yesterday although I saw 3-4 prominences [one arching!] with other cameras.

I am not talking about surface features, but simply DSLR not focusing on granulation and 'barely' focus on prominences - i.e. DSLR is not focusing and other cameras are.

I cannot reach focus on Canon 100D ... yet!
I really would like to see full view without shelling out for 'yet' another camera - not yet anyway.
M
SolarChatted

bart1805
Im an EXPERT!
Im an EXPERT!
Posts: 486
Joined: Mon Feb 06, 2017 9:04 pm
Location: The Netherlands

Re: PST + DSLR Full disk problem ...

Post by bart1805 » Thu Feb 28, 2019 11:16 am

Hi M, have you found this:
http://www.astrosoft.co.uk/Articles/PST ... 20DSLR.pdf
Why would you image with the Canon if you have a Altair 178M. The Altair cam will give you better results.

solarchatted
Oh, I get it now!
Oh, I get it now!
Posts: 26
Joined: Wed Mar 14, 2018 11:33 am
Location: Durham, UK
Contact:

Re: PST + DSLR Full disk problem ...

Post by solarchatted » Thu Feb 28, 2019 12:44 pm

Hi
Yes, I read that 'nice PDF' and it it is one of the things I could not try yet - because I do not have a Shorty.

Therefore I used a 22mm Barlow tip and stupiditely forgot about the 35mm eyepiece holder he had and also mine is 30mm - so I need to reach 30mm.

I think I am getting it now - I forgot that bit, thanks to re-directing me back there to re-read it.

First I was at 52mm - 22 off, then 43 - 13mm off then 23 - 7mm LESS - this probably was the nearest I got to focus, when I saw some prominences.

I can try shortening a nosepiece by 22mm [being 30mm in total - I need to measure it and I should be OK or get a short nosepiece.

It costs less to shorten normal nosepiece, also you can slowly file it until you reach best focus - one hopes!

I have to see what bits I have at home .

The only reason I wish to use the DSLR is to be able to easily take the whole disk.

The 178M seems to get about 75-80% of the disk with 30mm nosepiece + 22mm Barlow [52mm].
I am now hoping to try the shorten nosepiece [as above] from 30mm to 8mm +22mm Barlow [30mm total] onto the 178M as well and get the full Sun?

Unless I got it wrong again.

... I am not sure ... the 2x Barlow tip I have is quite thick - 22mm - compared to the shorty and possibly is focal length is different and the 30mm 'rule' is not valid - well, I can only try.

I even put the Barlow tip inside the eyepiece holder and played manually by adjusting camera in-out - no change!

M
SolarChatted

skyhawk
Oh, I get it now!
Oh, I get it now!
Posts: 47
Joined: Tue Feb 26, 2019 1:14 pm

Re: PST + DSLR Full disk problem ...

Post by skyhawk » Thu Feb 28, 2019 3:59 pm

I had a PST and needed a barlow to get focus
Just for info, if I ever come over as "blunt" or upset it is not intentional, I am AUTISTIC, I have Aspergers, and ADHD, Autism, so my apologies if I ever sound, unintentionally confrontational. Thank you

Esprit 120mm triplet refractor
Celestron Evolution Edge HD 8"
72mm Ed Skywatcher for Solar

SkyTee 2
Sky-Watcher SolarQuest
Gitzo Systematic Series 5

ASI 178MM
Daystar Quark Ha
WO Binoviewers
Many eyepieces 2"

User avatar
marktownley
Librarian
Librarian
Posts: 25298
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: PST + DSLR Full disk problem ...

Post by marktownley » Thu Feb 28, 2019 8:27 pm

Personally, I wouldn't waste time trying to image in Ha using a DSLR results are mediocre at best. You need a short c-mount nosepiece https://www.ebay.co.uk/itm/Short-C-Moun ... :rk:2:pf:0 and a barlow nosepiece and use the 178M.
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

Sol seeker uk
The Sun?
The Sun?
Posts: 6
Joined: Sat Feb 16, 2019 8:21 pm

Re: PST + DSLR Full disk problem ...

Post by Sol seeker uk » Fri Mar 01, 2019 8:35 am

Whilst on the subject of camera's, I'm finding it difficult to find focus on my Skyris.. would one of these c adapters work? I've no idea if I'm looking for inward or outward travel..tried a 3x Barlow(Not on the nosecone as it won't fit)
If I do need to go down the new camera route am I right in thinking smaller pixels on a standard pst, and does that change if I stage 1 or 2 mod it? Was looking at the qhy5 290m

solarchatted
Oh, I get it now!
Oh, I get it now!
Posts: 26
Joined: Wed Mar 14, 2018 11:33 am
Location: Durham, UK
Contact:

Re: PST + DSLR Full disk problem ...

Post by solarchatted » Fri Mar 01, 2019 10:27 am

marktownley wrote:
Thu Feb 28, 2019 8:27 pm
Personally, I wouldn't waste time trying to image in Ha using a DSLR results are mediocre at best. You need a short c-mount nosepiece https://www.ebay.co.uk/itm/Short-C-Moun ... :rk:2:pf:0 and a barlow nosepiece and use the 178M.
Hi
Just finished cutting/filing the nosepiece and with barlow fit I now got a 29mm total.

I understand what you mean now - therefore by nearing the barlow towards the 178M I should get a full Sun image.

OK, I can try use the one I cut now ... for now.

Thanks
M
SolarChatted

solarchatted
Oh, I get it now!
Oh, I get it now!
Posts: 26
Joined: Wed Mar 14, 2018 11:33 am
Location: Durham, UK
Contact:

Re: PST + DSLR Full disk problem ... AMENDED

Post by solarchatted » Fri Mar 01, 2019 11:33 am

If you can buy a new one, it seems the 174M is top with the PST!
I am only using the 178M, because I own one and save me to spend more than I have.

Which Skyris Model do you have exactly?
I am no expert, but I might be able to help and in any case you need to add that Barlow Nosepiece [the tip of the whole Barlow] and the C adaptor as mentioned by the very helpful marktownley or make one yourself.
SolarChatted

User avatar
marktownley
Librarian
Librarian
Posts: 25298
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: PST + DSLR Full disk problem ... AMENDED

Post by marktownley » Fri Mar 01, 2019 11:43 am

The pixels on your 178m are much better suited than the pixels on a 174m - 174m much better suited to longer focal ratios.
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

solarchatted
Oh, I get it now!
Oh, I get it now!
Posts: 26
Joined: Wed Mar 14, 2018 11:33 am
Location: Durham, UK
Contact:

Re: PST + DSLR Full disk problem ... AMENDED

Post by solarchatted » Sat Mar 02, 2019 10:58 am

marktownley wrote:
Fri Mar 01, 2019 11:43 am
The pixels on your 178m are much better suited than the pixels on a 174m - 174m much better suited to longer focal ratios.
Got it - thanks.

I could have brought my PST to work this morning as SUN is very clear - idiot me - to test the adaptor with DSLR and 178M
Hope tomorrow morning is decent enough ...
SolarChatted

Sol seeker uk
The Sun?
The Sun?
Posts: 6
Joined: Sat Feb 16, 2019 8:21 pm

Re: PST + DSLR Full disk problem ... AMENDED

Post by Sol seeker uk » Sat Mar 02, 2019 12:50 pm

Which Skyris Model do you have exactly?
I am no expert, but I might be able to help and in any case you need to add that Barlow Nosepiece [the tip of the whole Barlow] and the C adaptor as mentioned by the very helpful marktownley or make one yourself.
Thanks..I have the 236m Skyris and have bought one of those c adapters as they was cheap enough so if it don't work it's no big loss and maybe use it for something else.

Post Reply

Who is online

Users browsing this forum: Bing [Bot] and 1 guest