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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)
Good day. I need help.
I'm experiencing problems with our ZWO120MC being used as our guide camera with our telescope set-up.
It is connecting with the USB port but it is not being recognized. I tried restarting the PC, changing the USB cables, re-plugging and installed the necessary drivers from the ZWO website, but unfortunately, nothing worked. I tried with the other ZWO120MM and that one worked. So I thought it could be hardware or just driver issues. We operate all equipment through a Windows 10 Home Edition 64-bit PC.
I also did what ZWO support suggested us to do (uninstall and reinstall drivers) but did not work. Why's the case? Is it because of my camera's outdated or for any other reason?
Your thoughts/suggestions regarding this issue are much appreciated. Thank you very much. Clear skies.
I'm a newbie to mono imaging and am having trouble with circular/ring shapes in my subs. The circles are particularly pronounced after stacking my Lum subs but also appear in blue stacks. At the moment, this is making my lum subs unusable and I'm only just managing to put together RGB images.
I'm using an ZWO ASI1600mm with ZWO filter wheel and filters (36mm unmounted).
The attached TIF (LumStack.TIF) is 10x150sec of Lum subs stacked in DSS. The circles aren't very pronounced at this stage but after DBE and STF (see second SunflowerLum.jpg) the circles are very clear to see.
I've also attached a stack of Lum data on Bode's galaxy which shows the same issue.
Does anyone have any ideas what could be causing these?
Thanks in advance
All my lunar imaging has usually been done with DSLR camera and telephoto lenses, usually the Canon 100-400mm and a x2 teleconverter
Last nite I finally fired up the new scope and did some imaging
Skywatcher 120mm x 1000mm fl EVOSTAR Black Diamond
The mount is a HEQ5 PRO
so for the first lunar image through that scope with a ASI1600MM camera and Sharpcap capture software