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collimation...
Hi leinid - I most definitely second JB's comments: as he says, a photo is a bit difficult to comment on 'cos it depends whether you've got your photo shot "on axis" but I'd say his appraisal is right on the money.
When he says move your sec closer to the primary and then adjust the rotation, he's referring to making the sec central within the (bottom) OF THE FOCUSSER TUBE and also appearing concentric (circular) within the focusser tube - its' circular appearance having an even/equal "gap" all around it within the circular focusser tube's "ring/circle."
This will entail slackening off the 3 screws on the sec, holding it, without touching the mirror surface, and turning the sec's central bolt anticlockwise until it appears centralised in the focusser tube; and then physically rotating the sec mirror with your hand until it appears round and concentric within the focusser tube (even tho' it's actual oval) and then just pinching up the sec's 3 screws to hold it in that position. Then you adjust the 3 screws to get its' "tilt."
Cheers, Darryl.
The "tilt" is the adjusting of the secondary's 3 screws prior to adjusting the primary.
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