I revisited an old favorite for my first quick test with my new Takahashi FSQ-106EDX4.
23 x 600 second integrations, Baader Hydrogen-Alpha filter, FSQ-106EDX4 @ f/5, SBIG ST-8300 with FW5 filter wheel, processed with PixInsight.
I have a post that shows the internals and disassembly of this camera and filter wheel here:
https://www.astroturtle.com/2025/12/sbig-st-8300m/
My first shot of the Rosette Nebula with my new set of Baader narrowband filters.
The image was combined using SII (ionized sulphur) for the red channel, Ha (hydrogen alpha) for the green channel and OIII (ionized oxygen) for the blue channel. This combination is known as the “Hubble Palette” and is the same method used by NASA for the famous Pillars of Creation image.
I have a post that shows the internals and disassembly of this camera and filter wheel here:
https://www.astroturtle.com/2025/12/sbig-st-8300m/
The exposure breakdown is:
Ha 25 x 10 min
OIII 34 X 10 min
SII 33 x 10 min
For a total exposure time of about 15 hours.
AstroTech AT65EDQ telescope, Losmandy G11 mount, SBIG ST-8300M camera + FW5 filter wheel, Baader Narrowband filter set.
I got a second amazing night for imaging and despite it being a Tuesday I couldn’t resist having a go at some RGB data and eating the lack of sleep. I combined the RGB images with the hydrogen alpha data I collected on Saturday to get this image.
SBIG ST-8300m camera, AstroTech AT65EDQ 65mm f/6.5 refractor, Astronomik 1.25″ RGB and Ha filters, Orion Nautilus 7×1.25″ motorized filter wheel, Losmandy G11 Gemini-2 mount.
I have a post that shows the internals and disassembly of this camera and filter wheel here:
https://www.astroturtle.com/2025/12/sbig-st-8300m/
30 x 5 minute Hydrogen Alpha sub-frames for luminance
20 x 5 minute sub-frames for each red, green, and blue filter
30 averaged darks
30 averaged bias frames
Total of 7.5 hours of exposure time.
The final part of my Nexstar project was getting it on a wedge which would make auto-guided long exposure shots possible. Unfortunately, the Nexstar wedge has long since been discontinued and even if it hadn’t — $160 for a weenie little wedge for this scope was a bit much for me. So I decided to buy a cheap used wedge from an older Celestron system and make whatever modifications were needed to get it to work with the Nexstar.
What I didn’t expect was how little modification was needed to get an old 1980s era Celestron C8 wedge to work with the Nexstar SE. All the holes, both on the tripod and drive base lined up perfectly and the only modification I really had to make to the wedge was to hammer out the center guide peg.
I recently picked up a used Nexstar 6/8 SE mount and tripod. The idea is using it not only as a grab-and-go for my 72mm f/6 Orion EON, (and hopefully a 5 or 6″ SCT OTA down the line), but also in the hopes of using it for some lightweight wide-field long-exposure and time-lapse astrophotography.
I wanted to side-by-side mount a DSLR camera and wide-angle lens combo alongside my unused Celestron 9×50 finder scope from my CPC800 and use an Orion StarShoot autoguider attached to the finder to guide the whole contraption for long exposure photos. That this setup can run on batteries, and is lightweight enough to chuck in the back of the car for camping trips, made this an interesting camera platform despite the Nexstar’s well known astrophotography limitations.
