Guys.
Here's the latest in my 9.25 story. For those unfamiliar with my trials and tribulations this may not make much sense, out of context.
I've "dummied up" a representation of the star tests I saw last night through the new 9.25.
Now, keep in mind these are only representations and are not exact as the images appear in the eyepiece. Both the number of rings and the spacing between the rings is slightly different in reality.
The pic does, however, demonstrate a difference I noticed between inside and outside focus.
I appreciate most scopes, particularly newts and SCTs, rarely show exactly the same star images inside and outside focus.
What I'm hoping you can tell me is whether the difference I'm seeing is anything worth concern.
First of all, the scope had been outside for quite a few hours to come to ambient. However, given Canberra's climate, may not have been precisely at ambient.
Let's assume it was very close.
Inside focus shows a nice set of concentric rings. Outside ring is a bit brighter than the rest which appear evenly illuminated.
Outside shows similar, with that additional brighter ring approximately one third to half way in toward the airy disc.
That's about the only significant difference.
The (dark) space surrounding the airy disc in the outside focus test also appears more extensive. The inside focus seems to have "more" rings nearer to the disc. (NOT SHOWN IN DIAGRAM).
Other than that the scope seems OK. Visually, Jupiter and various DSOs appeared noticeably brighter than my previous (optically flawed) 9.25.
However, this scope only arrived Friday afternoon and as yet the seeing hasn't been good enough to make a comparison of detail.
Also, I suspect, the seeing could have rendered some variation in the inside and outside focus results?????
On first impressions (based on the simulated star test images i've attached).... what do these images suggest?
What does an extra "brighter" inner ring reveal?
Again, many thanks for your feedback
