California Nebula wide field

[gorann]

This is an accidental mosaic since the framing of the Samyang moved after the meridian flip at midnight (it was sitting on my triple rig and I only adjusted the framing for the large refractor after the flip). I think it was a fortunate move since it allowed me to catch a lot of dark nebulosity above and to the left of NGC 1499 and a cute little nebula called NGC1579. Taken from my garden obsy on the Swedish countryside in Värmland  on 21 Dec 2017. Temperature was ca -4°C and SQM 20.9.

Camera: Canon EOS 60D (unmodded) at ISO1600.

Lens: Samyang 135mm f/2 (@f/2)

Mount: SW EQ8

Guiding: SW ST80 + QHY5LIIM + PHD2

Exposures: 192 x 1min = 3.2 hours

(No flats, bias or darks but this is taken with an APS-C sensor on a lens intended for full frame DSLRs so no vignetting that Gradient Exterminator could not easily handle and the outside temperature of -4°C  kept the noise very low)

Filters: None

Stacked: PI

Processed: PS CS5

Cheers, Göran