Celestron/Vixen C6 Focus problems

Hello everyone. I have a Celestron/Vixen C6 f/5 with a sliding focuser. My problem is that the focuser does not have enough travel to bring some of my eyepieces into focus. The 9mm ortho, 12mm widefield, and 32mm plossl will not come into focus. My 26mm, 22mm, 20mm & 15mm plossls all focus fine. Can anyone help explain why this is so.

Michael Greenham said:

Hello everyone. I have a Celestron/Vixen C6 f/5 with a sliding focuser. My problem is that the focuser does not have enough travel to bring some of my eyepieces into focus. The 9mm ortho, 12mm widefield, and 32mm plossl will not come into focus. My 26mm, 22mm, 20mm & 15mm plossls all focus fine. Can anyone help explain why this is so.

Different makes and models will literally have the component elements grouped in different places within an ep barrel.

Determine which ep requires the most infocus. Then if possible adjust the primary up the tube, a bit closer to the focuser so it will focus. Sometimes it's just a matter of moving the mirror up hill with the collimation bolts.

Outfocus can be worked with para-focalizing rings, on those ep's that need to be out the focuser a bit. Or with an extension tube, which sometimes can be made with the right size piece of 1-1/4 drain pipe.