I will be investigating that. Last night I tried the new/old (it is a second hand OTA) 102mm f/5 on the EQ but did not bring the head all the way back so that OTA is level with the tripod head and could not get it to balance without the counterweights. Will try it again on the weekend. Problem is my C6 (6"f/5) shares the same mount as the new refarctor and this EQ mount is a very poor EQ3 clone
Darren