OAG spacing with MPCC

[blinky]

I am hoping to get hold of an OAG and as I will be using this with my F4 Newt I will need to have my MPCC somewhere in the train. So, where? Does it go MPCC>OAG>CCD or OAG>MPCC>CCD? I'm not sure if I need to have the MPCC before the OAG to make sure that the guide stars dont have too much coma?

[DIYASTRO]

Not too sure, But I think your logic is correct with the MPCC before the OAG.

What OAG are you thinking of getting?

Boyd

[blinky]

It the one on Modern astronomy - the same as the Orion Deluxe OAG

[Stephen]

CCD - OAG - MPCC

OAG will (hopefully) fit inside the 55mm spacing from the CCD to the MPCC, and the MPCC doubles up as a 2" nosepiece that you can put a further filter in/on.

[daz]

You'll probably need an extra spacer, Craig, to reach the 55mm needed for the MPCC.

I have a filterwheel in my train and I'm still about 2mm short!

[Stephen]

You'll probably need an extra spacer, Craig, to reach the 55mm needed for the MPCC.

I have a filterwheel in my train and I'm still about 2mm short!

My 314 (plus FW) requires an additional 10mm spacer!

[blinky]

Thats fine, I have a variable T extension, I just wondered what the order was.