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Russell
For planetary imaging with a DSLR and your new 6” f6 newt you need to do the following -
Set your live view to 5 x zoom , this will give you close to 1:1 pixel resolution
As the Canon 450D has a pixel pitch of 5.19 , the general rule of thumb you is you should be imaging at around f21 for average seeing and up to f30 for good seeing
To achieve f21 you will need a 4 x Barlow or Powermate
To achieve close to f30 you will need a 5 x Barlow or Powermate
Your focal ratio for imaging planets is relies on your Cameras pixel pitch um
The increased focal length ensures the pixels can be sufficiently sampled
These images of Jupiter were captured on my 6” f6 newt with a 4 x Powermate and 5 x Powermate and my Canon 600D pixel pitch 4.3um
Cheers
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