The Sky-90 is usable for visual without it... just, but for imaging you've gotta have one. Turns the scope into an f/4.5.
Great service from Green-Witch and Lee :-)
Below are the results from a very quick test that I carried out at lunch-time.
... and with flattener/reducer.
Without flattener/reducer.
... and with flattener/reducer.
BTW, you can't use a Meade f/6.3 reducer on these scopes, it doesn't work, I've tried it.
