×
INDI Library v1.8.1 Released (09 Sep 2019)

Monthly maintenance release INDI v1.8.1

How to use the Focus Module to focus on a galaxy

1 month 3 weeks ago
arminpro
Junior Boarder
Junior Boarder
Posts: 35
More
Topic Author
How to use the Focus Module to focus on a galaxy #44718
Hi,

what I did up to now is to focus manually or with auto focus on a star, which works fine!
But which settings to focus on a great object like M31 galaxy?

Sub frame or full frame?
Focus the center of the galaxy or the stars at the edge of the galaxy?

Regards,
Armin

10" Meade SC Telescope on Skywatcher NEQ6 Pro Mount
Starlight Xpress X2 Autoguider
Sony Alpha 7s DSLR Camera
INDI on Stellar Mate with Kstars/Ekos

Please Log in or Create an account to join the conversation.

1 month 3 weeks ago
Megiddo
Expert Boarder
Expert Boarder
Posts: 106
More
How to use the Focus Module to focus on a galaxy #44720
What I do is slew to a good nearby star, then use that to focus, then back to the main target (using the alignment module).

I use my bahtinov mask, since my internal focuser is not currently working for me (the donut issue).

Please Log in or Create an account to join the conversation.

1 month 3 weeks ago
Ihoujin
Platinum Boarder
Platinum Boarder
Posts: 716
Karma: 3
More
How to use the Focus Module to focus on a galaxy #44724
To help avoid confusing the focusing star detection with the faint fuzzies, you can try full frame focusing with the central area excluded

INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.

Please Log in or Create an account to join the conversation.

1 month 3 weeks ago
arminpro
Junior Boarder
Junior Boarder
Posts: 35
More
Topic Author
How to use the Focus Module to focus on a galaxy #44763
@ Megiddo: Which donut issue do you mean? Because I also see donuts after auto focus!

@ Ihoujin: What are the settings for " full frame focusing with the central area excluded"? Maybe you could provide a screenshot?

10" Meade SC Telescope on Skywatcher NEQ6 Pro Mount
Starlight Xpress X2 Autoguider
Sony Alpha 7s DSLR Camera
INDI on Stellar Mate with Kstars/Ekos

Please Log in or Create an account to join the conversation.

1 month 3 weeks ago
Megiddo
Expert Boarder
Expert Boarder
Posts: 106
More
How to use the Focus Module to focus on a galaxy #44772

arminpro wrote: @ Megiddo: Which donut issue do you mean? Because I also see donuts after auto focus!


You can see it in this thread: https://indilib.org/forum/focusers-filter-wheels/5447-odd-my-focuser-did-the-opposite.html

The focuser module starts by moving in/out and if it does it too much and creates the donut, it gets lost. I've tried pretty small step values, which makes me think I need to try even smaller steps. Tonight I'll try 5 or something tiny. (assuming clear skies)

Please Log in or Create an account to join the conversation.

1 month 3 weeks ago
Ihoujin
Platinum Boarder
Platinum Boarder
Posts: 716
Karma: 3
More
How to use the Focus Module to focus on a galaxy #44785
I can't offer screenshots at this time, but you will find among the check boxes in the focus module one called full frame. Then there are two fields to enter % of inner and outer fields to exclude. They are used to avoid confusion in the center and stars with aberration in the corners.

INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
The following user(s) said Thank You arminpro

Please Log in or Create an account to join the conversation.

1 month 3 weeks ago
arminpro
Junior Boarder
Junior Boarder
Posts: 35
More
Topic Author
How to use the Focus Module to focus on a galaxy #44788
Thank you Ihoujin!

10" Meade SC Telescope on Skywatcher NEQ6 Pro Mount
Starlight Xpress X2 Autoguider
Sony Alpha 7s DSLR Camera
INDI on Stellar Mate with Kstars/Ekos

Please Log in or Create an account to join the conversation.

Time to create page: 0.461 seconds