telescope adapters

[liam the liam]

Hello earthlings

I aim to begin astrophotography

but I am already experienced with telescopes. For my next telescope, i have chosen the celestron advanced vx 6" schmidt-cassegrain telescope. but i have a few questions about it. i will be using a canon dslr camera. i am planning to also by an autoguider along with the telescope. but i don't really understand this whole adapter business. is there an adapter that will let me zoom in and out on objects, so they take up the camera frame? with a schmidt-cassegrain telescope, will i have to use a barlow lense like on my old newtonian? what is the best kind of adapter for astrophotography? i want to image large nebulae and small galaxies. so what's the adapter for the job?

[JO90]

You can not zoom with this setup, however you can use a barlow or a reducer to increese and decreese magnification. Other than that you are limited to the focal length of the OTA you are using.

[baggywrinkle]

Do you mean an adapter to fit the camera to the 'scope? If so then you need to get a T ring and thread adapter so that it can fit to the thread on the visual back. This will give you a prime focus point for the camera to work at. Effectively you are using the 'scope as a large telephoto lens.

You might need a focal reducer too, this effectively increases the field of view of the 'scope. Have a look at the Celeston website and you can see these items and what they do.