I have a Megrez 80mm ED and have used the Coronado 60mm solar max
filter. Coronada has an adaptor plate that fits over the Megrez. I
suspect that it also would work with the Zenithstar. One word of
caution, I needed another extension tube (3") to reach focus. I
couldn't reach focus with the "normal" extension tube that comes
with the Megrez 80mm ED.
--- In William-Optics@yahoogroups.com
> I would welcome the experience of anyone who has found an H-alpha
> filter for any WO scope, preferably the 80 mm FD.
> Coronado makes a 90 mm filter that I couldn't afford in my wildest
> dreams; also a 60 mm, which I guess could be used with a mask. One
> could always buy a complete Coronado OTA and filter but the only
> affordable unit is their little 40 mm scope.
> At Table Mountain last summer I compared the view through it with
> view through a 100 mm apo equipped with a filter (the whole rig,
> owner told me, cost about $20,000) and the latter blew me away, so
> vision of somehow harnessing my FS80 FD for solar
> Thoughts and experience?
> John Barr