Discovery of the M31 [OIII] emission arc
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First light M16 with ZWO 153F4 newton
First light M16 with ZWO 153F4 newton and ATIK One
ZWO 153F4 Carbon Newton:
Diameter:6″ (153mm)
Focal ratio: F4
Weight(including handle, dovetail and rings): 3.8kg (8.3lb)
Focuser: 10:1 dual speed focuser
back focus: 65mm (+-5mm)
secondary size: 64mm
PV of the primary mirror: < 1/10λ (Surface PV)
Free shipping through EMS now (limited time and limited quantities)
http://astronomy-imaging-camera.com/…/153mm-f4-carbon-newt…/
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