SingAstro

ACrux absorption lines captured on 09 Apr 2025 from sg (Low resolution spectroscopy) Equipment used: Canon 200 mm lens with a 50 lines/mm transmissive grating attached. Canon 550D, Skyguider Pro mount. Software: Siril for stacking, RSpec for Spectral conversion. https://live.staticflickr.com/65535/5...

And finally

Can't stretch too far it seems, the core is getting too bright, also data acquisition time is very insufficient (less than 2 hours) partly due to mount meridian flip. n.b. forgot to mentioned 2" Orion skyglow filter has been used. https://live.staticflickr.com/65535/54129132283_959e538b4b_k.jpg

Yah, cytan San, i'm still trying to figure out how to use the Siril's generalised hyperbolic stretch to produce the s curve shape, a bit confused.

Yesterday evening sg sky was opened. Captured M31 with TS-65/420mm scope, Canon 550D cam. Shooting data: ISO 400, 60s X 111. Calibrated, registered and stacked in Siril, performed Histogram transformation, color calibration (photometric), noise reduction and background extraction. https://live.stati...

Adding a few more photos taken on 21 Oct 2024 evening. https://live.staticflickr.com/65535/54087723220_dffddb5c57_k.jpg https://live.staticflickr.com/65535/54086390897_3f5e77b075_k.jpg https://live.staticflickr.com/65535/54087599114_b1a3d97ef0_k.jpg https://live.staticflickr.com/65535/54086390892_8d...

Thanks Airconvent San, forgot to mention, the F stop had changed to F2.8. Also there was high cloud present although may not be thick. Taken many subs, most are useable.

This evening West sky opened, managed to get the tail (roughly processed.
Equipment wise the same except altitude now around 26.5 deg, also camera setting changed to 10s at ISO 100. Stacked 5.

Thanks Hardwarezone San for the recommendation to use Stellarium for planning. C2023 A3 Captured with skyguider pro mount last evening 13 Oct - 19:41 hrs when Altitude is around 5 deg. Canon 550D with EF200mm F2.8 Lens stop at F3.5, ISO:800, 5s X 9 stacked, strain the eyes can see a little bit of ta...

Simplified diagrams for better visualizations