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GSO RC6 review

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:

CN

SGL

Decoupler:

nateman_doo

Iceinspace

Thingiverse

Off the shelf collimation ring

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