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Contains:  Extremely wide field
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Stacking with no tracking, 


            Gilbert Ikezaki
Stacking with no tracking

Stacking with no tracking

Technical card

Resolution: 4630x3296

Dates:June 17, 2017

Frames:One Shot Color: 5x8" ISO3200 bin 1x1

Integration: 0.0 hours

Avg. Moon age: 22.17 days

Avg. Moon phase: 49.73% job: 1643500

RA center: 18h 52' 52"

DEC center: -13° 18' 14"

Pixel scale: 53.630 arcsec/pixel

Orientation: 142.215 degrees

Field radius: 42.328

Data source: Traveller


Using a 16mm FL lens on a APS-C sensor camera for night sky photography and a fixed tripod, I found that, at least to my visual perceptions, the star shapes were much better, but the signal to noise (S/N) was much worse with 8s exposures as compared to 15s. I happened to have 5 exposures at 8 secs and decided to try stacking them. I was surprised by both how well the star shape improved as well as the S/N boost. I don't have a dark set for this exposure because in the desert when this shot was taken it was 95F temperature in the middle of the night, and near the coast where I live it has yet to get over 90F in the day. I think with darks it might be much better. These are not sequential shots since I was using automatic bracketing at 8s, 15s, and 30s, so there is a 45s interval between exposures, this makes the camel's head much more fuzzy. This experiment makes me think one could do not all together bad astro-photography with only a fixed tripod and no tracking at all using a short, fast lens. I'll have to try that on some other trip to the desert.

Galleta Meadows Estates in Borrego Springs, California, USA.
Canon 60Da with Rokinon 16mm f/2.0: FL 16mm, f/2 @ 8s ISO3200.



Gilbert Ikezaki
License: Attribution-NonCommercial-ShareAlike Creative Commons

Sky plot

Sky plot


Stacking with no tracking, 


            Gilbert Ikezaki