M13 with Michael Stecker's C-11 black tube SCT at f/7
Globular cluster M13 in the constellation Hercules shines with over 100,000 stars at 25,000 light-years from Earth. This cropped image is a joint project of James Foster and me using my Celestron 11-inch black tube Schmidt Cassegrain telescope at f/7 (focal length= 1955 mm).
file: M13masC11-Color133min20128May24A-2asm.jpg

Photographic Data
Date:
May 28, 2024

telescope:
Celestron 11-inch (MAS's black tube) SCT with Starizona f/7 focal reducer/flattener
Focal Length: 1,955 mm
 

mount:
Astro-Physics 1200 GTO

imaging camera:
ZWO ASI6200MC-Pro color astro-camera.

exposure:
200 sec X 40 or 133 minutes (2.2 hours)

guiding:
off-axis
 

processing
Aquired and stacked by James Foster with Maxim DL & ASI Studio.
Post-processed in Adobe Photoshop Elements by Michael Stecker.
.
photographic site:
James Foster's observatory at Frazier Park California
https://en.wikipedia.org/wiki/Frazier_Park,_California
(Bortle 4 at 5,500 feet elevation)