I got everything from Agena Astro the other day. Everything screws together so
I got that part right. The resulting extension is about 3mm shorter than the
length of the Celestron SCT T-adapter I was using before. So the sensor was too
far away previously.
Unfortunately, there’s no “slip ring” in the stack of extension tubes anymore!
Whoops! That means I can’t get it on the C6 while the focuser is attached to
the scope! :-( The SCT T-adapter has one that allows me to position the
EFW/camera so that it avoids the focuser. No way to do that with the new
extensions.
I’m not convinced the reducer would work anyway. Starizona says those circular
marks in my previous image with the reducer on is caused by light reflecting
off the C6’s baffle tube. They also said they’ve never seen a reducer that
wouldn’t cause the reflections.
So I guess I’m stuck doing prime focus imaging with a bit of coma.
Mike McDonald
mikemac@xxxxxxxxxxx
http://www.mikemac.com/Astrophotos/M42_L_2019-03-22_20_Bin3x3_60s_reducer.png
On Jun 4, 2019, at 9:31 AM, Michael McDonald <mikemac@xxxxxxxxxxx> wrote:
LOL! Yeah, you haven’t seen my “straight” cuts! :-)
Thanks Jim for the pointer. I had never used Agena Astro before.
I went a head and ordered the SCT to M48 reducer, the 1” T spacer, and a 1”
M48 spacer. Theory being you can never have too many spacers! Actually, the
M48 spacer will give me the correct spacing for my ZWO OAG if I ever try
using it. It has the same length as the 16.5mm M48 to M42 adapter I’m
planning on using now. Then I can just swap the OAG for the 16.5mm adapter
and away I go.
Or so I think!
Mike McDonald
mikemac@xxxxxxxxxxx
