[g__day (Matthew)]

Well between showers tonight I tried to use the Lumicon OAG. Pointed it at Rigel Kentarus and got the Canon DSLR focused, but had rather more trouble focusing a Meade DSI.

So I swapped out the DSI and used a 22mm Vixen LVW through a 1.25" diagonal - and I still couldn't even see the star in the guider. No matter how I moved the mount around, how I changed the position of the OAG, nor bringing the eye-piece in or out I couldn't get a star, let alone a focused star.

I removed the eye-piece and looked into the prism and could see a star doughnut of light, but it looked to be off centre to the back of the eye-piece - not centred. I tried moving the mount but couldn't get it to be centred in the guide cell.

Any idea of what I am doing wrong. The image train goes SCT -> Meade Motorfocuser -> OAG -> DSLR on the main path and 1.25" diagonal -> Meade DSI on the other path.

Could it be the prism is slightly adjusted wrong, the image path having the Meade motorfocuser is screwing things up or does anyone with knowlegde of how to set OAG up correct able to offer suggestions please!

Many thanks,

Matthew

Picture of rear of OTA attached - before I added Canon DSLR and 1.25" diagonal