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From my other post, you all should realize 2 things about me. 1: I can't leave well-enough alone. and 2: I like to fiddle around with things. In my last thread, I got setup with my goto telescope and managed to control it remotepy with KStars or Stellarium and even got my CCD working so I can sit inside in comfort while stargazing.....ALMOST. I still have to run in and out to turn the focus knob. So....
There is a raspberry pi running the INDI server pointing the scope and managing th CCD. I have a nice little geared motor and a HAT board that I know how to connect and control with the pi to make the motor go fast or slow, or forward and backward. I can manage the machine work to create a connection to the focus mechanism for the motor. What I need to know is if there is already a DIY-ish or configurable driver for INDI. And yes, this probably is a post for INDI forum, but for some reason I can't get a login there. So, if anyone knows or has done this, thank you in advance for any information you are able to provide.
I asked a few weeks ago about charging two batteries from one solar panel. I’ve now got a solar controller which can do this, see below, but I’m confused by the instruction manual, especially how I should set the “charging priority”. I assumed the unit would charge battery 1 until full, then move on and charge battery 2 until full, then go back to 1. I’m not sure what this charging priority is - image of the relevant page from the manual below. I’d be grateful to hear what you think it means.
Please find for sale my SkyWatcher 250 Reflector and NEQ6 SynScan mount.
The reflector has of course been used and shows sign of use on the outside of the tube but the mirrors show little sign of wear or tear apart from a few dust specks. As you can see from the photos the Scope is in very good condition and all viewings are welcome.
The NEQ6 mount powers up but refuses to move. This may be just an update to the handset or maybe the gears need a touch of TLC due to itself being sat doing nothing for so long. The tripod is missing the locking pin that pulls the plate up against the legs but this will be reflected in the price.
i would like to offer this to the SGL community as I know it will go to someone who will appreciate the kit and do so much more with it than I’ve been able to.
Given the fact I haven’t used this kit for a few years now and I’m also moving house, I know longer have the time or room for it so this is the only reason for sale.
*** Update 26/1/2020
I have purchased a new support shaft for the tripod and I have also got the NEQ6 moving so the motors seem to be absolutely fine, please see latest video attached of the NEQ6 powered up and moving.
Skywatcher 250 - £200
NEQ6 - £450
Collection only from Walsall/West Midlands
Please don’t hesitate to contact me if you have any questions and I will do my best to answer them.
Wishing you all clear skies wherever you are
I made an acquisition and processing tutorial a while back (3 years ago? Yikes!) and it is fairly dated in terms of what I'm doing these days. I've been asked for a long time to make a new one showing what I'm doing these days. Specifically how I'm processing a single shot image for both the surface and prominences and how to process them together to show prominences and the surface at once. I've abandoned doing split images and composites and strictly work from one image using layers. Acquisition does not use gamma at all anymore. Nothing terribly fancy, but it's not exactly intuitive so hopefully this new video will illustrate most of the fundamentals to get you started. Instead of an hour, this time it's only 18 minutes. It's real time from start to finish. I'm sorry for the long "waiting periods" where I'm just waiting for the software to finish its routine, it lasts 1.5 minutes and 30 seconds tops typically at first. The first 4 minutes is literally just stacking & alignment in AS!3. I typically will go faster than this, but wanted to slow down enough to try to talk through what I'm doing as I do it. Hopefully you can see each action on the screen. I may have made a few mistakes or said a few incorrect things or terms, forgive me for that, this is not my day job. I really hope it helps folk get more into processing as its not difficult or intimidating when you see a simple process with only a few things that are used. The key is good data to begin with and a good exposure value. Today's data came from a 100mm F10 achromatic refractor and an ASI290MM camera with an HA filter. I used FireCapture to acquire the data with a defocused flat frame. No gamma is used. I target anywhere from 65% to 72% histogram fill. That's it! The processing is fast and simple. I have a few presets that I use, but they are all defaults in Photoshop. A lot of the numbers I use for parameters are based on image scale, so keep that in mind, experiment with your own values. The only preset I use that is not a default is my coloring scheme. I color with levels in Photoshop, and my values are Red: 1.6, Green 0.8, Blue 0.2 (these are mid-point values).
Processing Tutorial Video (18 minutes):
RAW (.TIF) files available here to practice on (the same images you will see below as RAW TIFs):
Video for Acquisition, Focus, Flat Calibration and Exposure (20 minutes):
(Please let me know if any links do not work)
Results from today using this work flow method.
SSM data (sampled during 1.5~2 arc-second seeing conditions):
Equipment for today:
100mm F10 Frac (Omni XLT 120mm F8.3 masked to 4")
Baader Red CCD-IR Block Filter (ERF)
PST etalon + BF10mm
SSM (for fun, no automation)
I am thinking on grinding my own lightweight mirror (first f4 16", later f4 24"). The lightest and cheapest option is to get a thin blank and slump it in a decent kiln.
Anyone has longer term experiene with slumped mirrors? Overall doesn't seem to be more work than a normal (not pregenerated) blank.
Do I have to grind the backside as in case of normal flat back mirrors to avoid astigmatism? How do people support a convex back while grinding? Does it make sense to grind a hole in the middle for additional support? I am remotely considering a convertible Newtonian/Cassegrain system anyway...