Quote:
Originally Posted by OneOfOne
The first night out I tried the C11 on the Moon and of course could only get a tiny sliver onto the laptop screen  Basically, no big surprise with a focal length of around 3000mm. |
If you want to take moon or planet photos then 3000 mm is not enough. A .3 reducer will make the moon and planets even smaller.
For moon and planets you need to increase and not reduce your focal length. With a 4 by powermate you will have 12000 mm focal length and Jupiter will look great. With a .3 reducer it will be the same as through a refractor with a low power eyepiece, i.e very very small.
For DSO's it is the reverse. You want the zoom but not so much maybe and F10 requires very long exposures. In this case a .63 reducer would be the go.
Although I havnt tried I have been told that a .3 reducer will cause severe vignetting. Though on a small chip like a DSI II this may not be the case. Certainly on a DSLR it would. Another option is a lumicon giant easy guider. These things are supposed to give no vignetting at all. I was lucky enough to get one second hand for around 200 bucks, normally they are around 500 AUD.
Paul