Primary<--------->Secondary

[frogman (Anthony Lord)]

are there any measurements that tell you how far apart the primary to secondary should be??????

[ballaratdragons (Ken)]

Depends on focal length of primary and - believe it or not - diam of tube!

[frogman (Anthony Lord)]

ok mines the same s yours if you got it from Andrews

[ballaratdragons (Ken)]

Are you trying to centre the 2ndry up and down the tube?

[frogman (Anthony Lord)]

yeah John B told me when he saw it that it wasnt the right distance apart ???? It looks fine to me nice clear images but im only newish to it all.......

[atalas]

Hi Anthony, centre the diagonal under the focuser, once this is done you get the offset you need dude !

Louie

[ballaratdragons (Ken)]

When you look square down the focuser tube the 2ndry should be very close to centre. See diagram below. Never centre it exactly as it needs to be a fraction off dead centre.