55mm spacer

[look out hes above u]

Hi peeps,I have a celestron 6.3 FR on my 9.25 sct but still get coma on my Subs,I've been reading some posts and just want to get it right,do I need to get a 55 mm spacer to go inbetween my FR and my canon 700d and where is the best place to buy one and do I call it a spacer,soz if abit of a silly question,thx for any tips

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[lensman57]

Hi peeps,I have a celestron 6.3 FR on my 9.25 sct but still get coma on my Subs,I've been reading some posts and just want to get it right,do I need to get a 55 mm spacer to go inbetween my FR and my canon 700d and where is the best place to buy one and do I call it a spacer,soz if abit of a silly question,thx for any tips

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Here is where I got mine from.http://www.opticstar.com/Run/Astronomy/Astro-Accessories-Imagers-Opticstar.asp?p=0_10_5_0_3_726

A.G