William-Optics 0.8X Reducer/Flattener II

I got this flattener sometime in September last year due to the amazing egg stars (field curvature) of my William-Optics Zenithstar 70ED small refractor. I haven't gotten around to making a before-and-after comparison until now.

Center (this is Rigel) without and with the flattener. The stars aren't perfectly round due to my imprecise polar alignment.

without flattenerwith flattener

And the edge (not extreme edge)

without flattenerwith flattener

1 comment:

Gary said...

Good side-by-side illustration of what a flattener can do.