So i'm wondering what I should consider next for expanding the range of options for deep-space imaging with my 350D.
Currently:
- I have a Saxon ED80, focal length 600mm f/7.5. Good for fairly large objects or wider starfields but not so great for smaller objects, as they cover a very small area on the camera chip.
- I'm getting a WO 0.8x reducer, which will give me a focal length of 480mm and a focal ratio of f/6. Again, good for large, wide objects or wider starfields.
But what if the object is small and I want a closer view..
- I could get a 2" 2x barlow, giving me a focal length of 1200mm, but slowing the scope down to f/15.. meaning longer exposures are required.
- I could use a 2" 2x barlow in combination with the WO reducer to give me around 960mm focal length but still very slow at f/12.
So what about a newt then? A 6" or 8" newt would give me similar focal lengths (800-1000mm). The advantages include a larger aperture, and a faster focal ratio (f/5 or f/6 usually) which means I can use much shorter exposures. (and look at what Garyh and Ezystyles (Eric) do with their 6" and 10" newts!!
)
Sounds all good?
I guess there are some disadvantages. I'd also need:
- An MPCC to reduce the coma,
- A set of rings/dovetail to hold it on the EQ6,
- Some sort of piggyback system for the ED80 or cheapo refractor to guide with (although I still need to do this with the ED80 on its own for guiding).
So, more cost. Probably more hassle. And do I really want to delve deeper into deep space imaging? I'm not sure yet
Anyway i'm just thinking out loud so your opinions and suggested are most welcomed.
Cheers