View Single Post
  #1  
Old 08-05-2014, 12:36 PM
cometcatcher's Avatar
cometcatcher (Kevin)
<--- Comet Hale-Bopp

cometcatcher is offline
 
Join Date: Jan 2005
Location: Cloudy Mackay
Posts: 6,542
NGC6723 in Corona Australis - a scope comparison

I've seen some pretty spectacular images of this region on the forum, mine ain't one of them. However I thought I would post these two comparison images for a bit of fun. This is a comparison of a 6 inch F5 Newtonian to my new Skywatcher ED100 F9 refractor. Kind of like comparing apples to oranges, but then that's the point.

There's a little globular cluster (NGC6723) some blue reflection nebula and dark nebula in this region. Here I have just short of half an hour for each scope, both with 1 minute subs at ISO 1600 on the Pentax K-x. For a shot I would be happy with, I'm thinking about 5 to 10 hours would make for a nice end result. Yeah like that's ever going to happen here in the tropics. There is some mirror flex on the Newt, looks like I will either have to redesign the mirror cell or use shorter subs. I'm surprised the refractor is nearly able to keep up, but the F5 Newt is definitely in the lead, but not by that much.

What do you guys reckon?
Attached Thumbnails
Click for full-size image (NGC6723_6F5_reflector.jpg)
191.2 KB56 views
Click for full-size image (NGC6723_4F9_refractor.jpg)
96.3 KB53 views
Reply With Quote