Hi Ken,
I have had some good success with both the Hotech Flattener and the newly revised William Optics III 0.8x Flattener/Reducer.
I have attached a couple of the links which indicate the results on both my ED80 and ED120....
http://www.iceinspace.com.au/forum/s...ad.php?t=86746
and
http://www.iceinspace.com.au/forum/s...ad.php?t=80765
Hope this helps.
Cheers,
Daniel