Contains:  Extremely wide field
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Above the Trees, 


            Gilbert Ikezaki

Above the Trees

Technical card

Imaging telescopes or lenses: Rokinon 16mm f/2.0

Imaging cameras: Canon EOS 60Da

Mounts: MeFoto Globetrotter

Software: Digital Photo Professional  ·  Deep Sky Stacker  ·  HDRsoft Photomatix Pro 5  ·  Stark Labs Nebulocity 3

Accessory: FotoTech Timer Shutter Release Remote Control

Dates:Aug. 17, 2017

Frames: 1x8" ISO3200 bin 2x2

Integration: 0.0 hours

Darks: ~32

Flats: ~32

Flat darks: ~32

Avg. Moon age: 24.81 days

Avg. Moon phase: 23.20%

Basic astrometry details job: 1814464

Resolution: 1824x1215

Data source: Traveller


An experiment using control frames on a single subframe in order to get very short exposures and round stars with a non-tracking mount. I used darks, flats and flat darks. I also binned 2x2 to reduce noise. The rule of thumb is one can get the bare minimum roundness if the focal length of the lens in millimeters times the exposure in seconds is less than 500. Here I'm using 16mm x 8s = 128, and getting pretty round stars, but the under exposure means lots of noise.

Canon 60Da with Rokinon 16mm f/2.0: FL 16mm, f/2 @ 8s ISO3200.
Grant Village, Yellowstone National Park, Wyoming, USA.



Above the Trees, 


            Gilbert Ikezaki