[Moonman (Michael)]

I have a 420mm refractor that is most likely physically able to be mounted on my LX90. If I plug in a 6.3 focal reducer into the lx90 (2000mm fl) and effectively bring it back to about 1300mm should this make autoguiding with the refractor a proposition or do I still need a longer focal length in the guidescope?

If anyone has tred this path before me I'd appreciate the advice.

Cheers

Michael