before any collimation:
most of image looks ok. no field curvature to edge to field. the lines are straight
unstacked single shot
stacked, colour unadjusted
but for some image, it show up double image. reason unknown
the subject buildings are 1.2 km away. the "double lines" are mainly horizontal lines, 40 to 50 pixels apart ( whereas it does not show up in lines of 16 pixels apart)
focuser: coarse:
1 turn = 13 mm
fine:
1 turn = 1.3 mm
for 25 mm eyepiece
1 in x2 + 2 in
~ 96 cm from front to focuser exit
astronomics collimation guide
https://www.telescope.com/Orion-6-f9-Ritchey-Chretien-Astrograph-Telescope/p/114473.uts
Collimation:
Decoupler:
Off the shelf collimation ring
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