It is hard to picture scale for astrophotography and where to find things. This is my first attempt at video on AstroBin - lets see how it works.
The Orion constellation is pretty easy to find if you look for Orion's 3 star belt. This time of year you will see this in the south western sky early in the night. It wasn't until I started doing some of these images that I realized where some of these nebula were in the sky and how big they really are. This movie starts out at a 50 mm focal length, which is pretty close to what you would see by eye, then zooms in with a few different telescopes to show you the Orion nebula and the horsehead nebula. In the wide shot you can see that the stars are stretched due to the rotation of the Earth - even after only 13 seconds. The telescope images were acquired on a mount that tracks the stars so I don't get the star trails. The second time it zooms in the image is from a much larger telescope that used narrowband filters to show hydrogen, sulfur, and oxygen (HSO). Those objects are big, but faint so we can't see them by eye.
Info on the shots and links to high resolution images:
Canon R5, 24-70 f/2.8 lens, at 50 mm, 13 sec exposure
Canon R5 RGB, 60 mm APO telescope f/4.5, Focal Length 280 mm, 45 min exposure
Canon R5 with narrowband filter, 60 mm APO telescope f/4.5, Focal Length 280 mm, 1.75 hr exposure (
https://www.astrobin.com/rr73an/)
ASI 2600 Mono, EdgeHD SCT 9.25 inch with Hyperstar f/2.2, Focal Length 525 mm, 15 hr exposure (2 panel mosaic) (
https://www.astrobin.com/7lmnh0/E/)
Comments