|
1) The LPI doesnt focus at the same point as an eyepiece
2) The LPI has a FOV similar to about a 9mm eyepiece, so if you were slightly off centre with a 26mm eyepiece it could be out of the FOV for the LPI.
Your LPI will usually come with a "par-focal" ring. The idea being that you work out focus with the LPI, then insert and eyepiece and find out where it comes to focus by sliding the eyepiece in and out by hand, then tighten the parfocal ring once the focus is achieved. Then you can swap them back and forth as needed.
|