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Old 08-03-2021, 08:16 PM
Startrek (Martin)
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Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 3,339
Quote:
Originally Posted by evltoy View Post
Hey Guys,

Once again thanks for all your experiences & knowledge in helping me out.

I'm currently still on the south coast and it has been kind to me with no rain since I have been up here. With this, I have been able to leave my neq6 + 8" SCT/ED80 out (covered) for most of my stay. I have also managed to use the Park feature which works 100%... what a time saver!

OK. so based on everyone's feedback here and what I have read here is what I have done.
1- Mark up mount; Home location, RA, Dec clutch etc.
2- Rough polar align Tripod (south)
3- Level tripod with a builders spirit level on solid ground
4- Place head on tripod and balance in both Dec & RA with OTA + gear
5- Set up clocks in both Dec & RA
6- Give a little eastward heavy by adjusting weights (lower)
7- Do a 3 start Alignment - Default HC brightest stars (Sirius, Alpha Centauri, Rigel)..
8- Polar Align on Sirius (through DSLR finder, centered) very close
9- Turn off mount

10- Reset clocks & turn on mount
11- Do a 3 start Alignment - Default HC brightest stars (Sirius, Alpha Centauri, Rigel).. very little adjustments
12- Polar Align on Sirius (through DSLR finder, centered) Bang on centered!
13- Turn off mount

14- Reset clocks & turn on mount
15- Do a 3 start Alignment - Default HC brightest stars (Sirius, Alpha Centauri, Rigel).. spot on, no adjustments
16- Polar Align on Sirius (through DSLR finder, centered) no adjustments required
17- Using the Park feature from here on after end of session

My Polar Alignment Error readings are “Mel=+000,00’00" Maz=+000,00’05”

My guiding through PHD2 is default settings with letting PHD2 selecting a guide star (SNR was 4 or 5ish) and total error was around .30-.40 (running for 3-4mins) before shooting.

Some said to check my back focus spacing as the eggy stars were in different directions on the outer sides of my frame. From no spacing (using the Celestron reducer + T-Adaptor and T-ring) to putting a 5mm spacer I saw no difference. And here is an image I did last night with a 10mm spacer.

I selected the best 33 images in DSS and the exposure time was only 90sec per sub

Can anyone provide some direction on why my stars are the way they are on the edges?

Cheers
Wayne
Wayne ,
Just went through your procedures
I assume your using an EQ6 mount with your Synscan handcontroller
Firstly are you using the Synscan handcontroller to Star align and Polar align ?
I’ve only ever needed a 2 star alignment ( one of those stars being your polar alignment Star )
Secondly why are you repeating all your processes twice as you only need to polar align once ( if your happy with the error )
Thirdly I’ve never seen anyone polar align to the low numbers you have displayed which are are unbelievable
Lastly you don’t need to adjust the setting circles ( clocks ) on your mount ( I just use them to set home position on the mount and that’s it )
Yes with Synscan you can save your alignment data and when you power up again you select option 1 “start from park position”
I just have a query with your Synscan polar alignment procedure ( did you use the PDF file I sent you to carry out the Synscan polar alignment routine ?)
Cheers
Martin
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