M13
-
globular cluster
22.8.2003
DATA
| Telescope | Celestron C8-SGT |
| Camera | Casio QV-3500EX |
| Lens | 35mm f/2 |
| Exposure | 40+20+20 s |
| ISO | 180 |
| Eyepiece | 25mm |
Dark frame subtracted,
levels adjusted, noise removed with Photoshop.
First time I used focal reducer
in these images. Focal reducer decreases focal ratio (f/10 -->
f/6.3) and at the same time also shorter exposures can be used.
Focal reducer is maybe better in diffuse objects like nebula
etc which has low surface brightness.
Guiding seems to be better in these images as I ever achieved with StarMax 127.
Below is one of the raw images
(40 s).
