F6.3 Reducer on C8 - Back focus

[PeterCPC]

I have read that the back focus for a reducer on a C8 is 105mm but I have also seen 85mm quoted. Does anyone know what the definitive answer is? What works for you.

I am intending the use an ASI533. So reducer/OAG/533.

[PeterCPC]

Manufacturer of the reducer has now said 85mm + or - 15%. So 72-98mm.

[newbie alert]

38 minutes ago, PeterCPC said:

Manufacturer of the reducer has now said 85mm + or - 15%. So 72-98mm.

What reducer manufacturer said that?  

15% tolerance... 26mm difference... Quite abit I'd say optically

[PeterCPC]

14 minutes ago, newbie alert said:

What reducer manufacturer said that?  

15% tolerance... 26mm difference... Quite abit I'd say optically

Astromania - Celestron never responded. My thoughts exactly.