Hi Russell,
No worries mate.
I didnt need a spacer for my Canon 1000D, the T ring and the MPCC, I simply screwed the MPCC into the T ring and off I went on my 12" dob. On my 8" newt however, I cant get enough inward focus, so I bought a low profile 2" focuser adapter from the UK.
If you got focus, you should be able to see if there is coma in the corners quite easily.
Seems, your question also made me think that its the 28mm and the 14mm spacers I need to get a total of 42mm from the front of my Atik as the sensor is 13mm below that, so bang, smack on 55mm is what I need.
Now, back to the original question? Where can you buy JUST the spacers from?
Chris
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