Hyperbolic Newtonian Astrograph
The latest addition to my imaging complex is a 12 inch
f/4.27 Hyperbolic Newtonian Astrograph (HNA).
I really liked the design and performance of the Takahashi Epsilon
I designed and built this astrograph around Hubble Optics HNA 12 inch
It took 3 years to get the project together to spread out the cost.
The mirror comes with a 3.5 inch matching corrector and 3.5 inch
Supporting the optics is accomplished through a Van Slyke mirror cell
The tube is a Frank "Rocketman" Uroda 14 inch carbon fiber tube.
Finally, a 3.5 inch Starlight Instrument focuser w/Robofocus completes
Custom adapters to connect the optics to cameras provided by Precise
The following images were taken in September/October 2013.
Clouds have reigned since. (First good clear night last night Feb
16 2014 since Oct 10 2013 and Robofocus
isn't working and it's 20 below zero)
I tried a number of objects just to see what the scope could do.
All images using SBIG STL-11000M w/Baader filters unless otherwise noted
Hubble Optics Hyperbolic Newtonian Astrograph
Butterfly Nebula in Cygnus (75 minutes Hydrogen Alpha / SBIG
75 minutes Hydrogen Alpha combined with only 30 minutes RGB each.
60 minutes Luminance
Hybrid Image Luminance fron HNA12, LRGB Takahashi ED180
LRGB 60:30:30:30 minutes
Ha:R:G:B 160:40:40:63 minutes - getting
Elephant Nebula (75
minutes Hydrogen Alpha / SBIG STL11000M)
90 minutes Hydrogen Alpha Feb 19 2014.
Comparing Resolution - This is a cropped area of the
Rosette Nebula showing the difference
in resolution between a 12 inch mirror on the left and a 7.2 inch
mirror on the right.
Same design, same camera.
Exposure on left 90 minutes at f/4.27
Exposure on right 3 hours at f/2.85
This is a hybrid image.
150 minutes of Hydrogen Alpha light through the HNA-12
combined with colour information from the Tak ED180.