Switch to mobile style

Nexstar Evolution First Light

Re: Nexstar Evolution First Light

Postby Aratus » Fri Aug 24, 2018 11:21 pm

Graeme1858 wrote:
Aratus wrote:Unless there is something new happening that I don't know about,


From what I've seen there's not much chance of that! :)



Don't you believe it. There are always new developments! It is hard to keep up with everything sometimes. :D

Some people when looking through an SCT are surprised to find that they don't get a doughnut shaped image everytime they look through it! (and of course a Newtonian reflector has much the same problem. ) What actually happens is that normally the 'shadow' is dispersed across the image, and the only effect is that gives a slightly lower contrast. The 'doughnut' also turns up if the telescope is less than focused, and a long exposure of a faint area just gives a field of doughnuts! Specks of dust can also end up as 'dark doughnuts' on your images. :evil: :D
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
Aratus
 
Posts: 812
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

Re: Nexstar Evolution First Light

Postby Graeme1858 » Sat Aug 25, 2018 1:00 pm

Seems I need to investigate this phenomenon! There's me thinking I had an advanced grasp of optics and then another aspect comes to light! The more you know, the more you find out you don't know! It keeps the hobby interesting.
_______________________________________
Miranda 10x50 Binoculars
Skywatcher Dobsonian 10" (EBay sale auction ends tomorrow!)
Celestron CGX 9.25" (coming Thursday)
Graeme1858
 
Posts: 99
Joined: Tue Jul 24, 2018 2:32 pm
Location: Kent, UK, 51°22’N 0°32’E

Re: Nexstar Evolution First Light

Postby Graeme1858 » Sun Sep 02, 2018 7:20 am

Third time out last night and the wireless connection has packed up! I did a two star alignment with the hand controller which wasn't spot on but was able to get me to quite a few faint fuzzies. I've retrieved the zoom from storage so that speeds things up a lot. My view where we are at the moment is due south but narrow, so I did get to see; Albierio again, M57 the Ring nebular again, M27 the dumbell for the first time and the M56, M15 and M2 globular clusters, Then spent a long time on Saturn and then Mars when it came up over the neighbour's roof.
_______________________________________
Miranda 10x50 Binoculars
Skywatcher Dobsonian 10" (EBay sale auction ends tomorrow!)
Celestron CGX 9.25" (coming Thursday)
Graeme1858
 
Posts: 99
Joined: Tue Jul 24, 2018 2:32 pm
Location: Kent, UK, 51°22’N 0°32’E

Previous

Return to Telescopic Observing

Who is online

Users browsing this forum: No registered users and 0 guests