Tommy telescope Austriasta oli viime yönä tehnyt putkeni pikana valmiiksi ja postitukseen!
Tässä hänen viestinsä:
Your Esprit has now a new rubber buffer ring in front of lenses, and lenses are collimated
and the center lens well supported. So it stays in collimation when knocking on the cell.
The front and rear lens are very slightly supportes by the screws, they are senisitive.
If you have very cold temperatures and you see dark structures in the star halo coming,
you just loosen the respective screws on the front and rear lens by 1 tick (1/32 turn), not middle lens.
Now the star halo is without structures, very smooth, as we like it.
The focuser is centered on the objective, and the objective to the focuser, so the optical axis is dead center.
The focusers friction is adjusted, but you can do that yourself by tweaking the two teflon bars inside.
You find the M2,5 screws next to the focuser wheels. And the focusers worm housing is tightened
(sometimes a screw is just loose there).
I made interferograms and the fringes are very straight, estimation of Strehl is about 95% at 550nm.
