17th Aug: WL + HA (Frankenscope)

[Macavity]

Still messing with ST102 Frankenscope at 70mm aperture!
Certainly no Quark or (virtual) "Lunt 70"! But there is hope?
(Making 90mm ERF cell and thinking about Donor scopes!)

As a "control" here's my WL ED66 Barlowed 3X (f/1200mm):



A now the 70mm Frankenscope image scaled to about the same size:

And also the day's main Proms (A bit noisy with the DMK41?):

  

It may be that the most suitable *native* focal length for a
90mm Frankenscope is indeed about 600 (not 1200!) mm.

[Pete Presland]

Lovely set of images, very interesting looking last prom image as well.