eos5dIII image scale

[umbilic]

I have a canon EOS5d III camera which I use sucessfully with a celestron 8 - the image fits beauitfully. I would like to use it with my celestron C11 CPC but the image is too large - because of the longer focal length. In the past I have used series focal extenders (2x 2x+1.4x) to get good images with a canon 400mm f2.8 lens, and have used a 1.4x extender between the camera and a T adapter with a celestron C6. Having had success with focal extenders, I have been trying to find a focal REDUCER to put between the camera and T adapter to reduce the image scale - but I cannot find an appropriate device - am I being tyoo naive ? HELP please !

ps I have tried screwing an eyepiece focal reducer into the T adapter - getting a .5x barlow but cannot find focus - besides the reducer has awful chromatic abberation - any ideas that might help here ?

[michael8554]

How about a Celestron f6.3 Reducer ?

https://www.firstlightoptics.com/reducersflatteners/celestron-f63-focal-reducer.html

Not sure how much of the Full Frame EOS 5D it will illuminate though.

Michael

[umbilic]

thanks for your reply - I already have a celestron focal reducer - but I use a Moonlight electric focuser and I see 2 problems

1) I believe the celestron reducer is designed to fit the 'visual back' of a C8.If I does fit the C11 (which has a different optical back) I presumably could not use the Moonlight focuser.

2) I want something like the Canon extender which fits between the acmera and the telescope so |I can use it wit hout dismantling the focuser'

put simply is there a focal reducer which fill go between the Canon camera and the telescope - just as my extender will ?