Marc for the stock standard ED80 the WO II works a treat, the WOIII doesn't float the boat (Got this info from Kris at WO ) but the WOIV is supposed to do the job. I hope to test one at Astrofest. Interstingly the WOII is hopeless on the WO Megrez 72FD and it apparently needs the WOIII. Sometimes I guess its a case of trial and error. What we need is to have a "Refractor and Reducer Party" sometime/somewhere to trial all the combinations. Shouldn't take more than a month of imaging to get it right.
