Quote:
Originally Posted by paulF
Hey everyone,
i'm planning on buying a new 8 or 10 inch in the near future so this will leave me with a 4 inch reflector and a 2.3 inch refractor to play with 
I'm thinking of changing the focal length of the 4inch from 900mm to a minimum of 2000mm. i know this will mean a lot smaller field of view but a lot more magnification but not quiet sure what to expect.
Can someone can shed more light on what should i expect with such a set up, a 4inc reflector with a 2000 focal length?
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How were you going to change the focal length?
You would need a new mirror.