Zenithstar 66 For Wide Field Imaging?

I'm considering purchasing a new William Optics Zenithstar 66, 400mm at F6.1, Petzval design ED semi-APO refractor for wide field imaging. At $298 (WA-ZS-66T) from Anacortes, it seems like a possible lower cost alternative to the FS-60C and TV 60. My imager is the SXV-H9 and I am primarily considering it for H-alpha (nebula not Solar) imaging.

What about using a Meade .63 focal reducer for 254mm at F3.84?

Any thoughts or comments are welcome.

Thanks

It would likely me fine for H-alpha imaging. Color imaging would likely be a problem however (not an apo, only semi-apo). The Petzval design will give a flat field intrinsically. It will not work with another reducer/flattener (such as Meade or other) as these will induce severe star distortion with the Petzval design.

Tom