Uh! Bingo on those adjusters. Man I feel stupid
bloody small though and camoflaged black. Maybe I should take back that last bit from the last post! Doh! opened my mouth to quick didn't I.
Jason (or anyone else for that matter) here's another question or few as well as knightriders.
In a perfect scenario wouldn't the secondary mirror have a plane running through the centre of the face of said mirror (shortest distance across mirror) where the centroid of the ellipse is? Wouldn't it be that both sides should then be equal to distibute the light evenly?
I would have thought that the light still travels the same distance to the focuser no matter where it comes from when coming from the primary? Then are we stacking the light to one side by making the secondary mirror a circle (through the focuser) and moving the centroid further forward of the focuser axis point?
Or is it due to the fact that we are tensioning/adjusting from behind the secondary away from the central plane of the secondary, therefore setting another centroid further back, which creates a spherical/arcing movement to the secondary mirror and that is why that we see the picture on the right as you have shown? If so wouldn't it be better for manufacturers to attach the mirror with spiders (or some other mechanical device) at the central plane of the secondary mirror face to get a better alignment? I think this might be over complicating things and bring its own set of problems but it seems logical.
Or is this why we adjust the primary last to compensate for that shift forward in the centroid of the secondary mirror?
Last question I promise! Or is the centroid of the ellipse negated because what is "seen" by the light as it travels towards it is actually a circle and its centroid is what we are ligning up on? To me it would seem that the circle viewed from the primary would have a different centroid to the one viewed from the focuser in regards to where that falls on the elliptical secondary mirrors face ie. longitudinal axis.
I hope that all makes sense!
Simmo