开云体育

Hi,

Seems like the alignment of?corrector plate to secondary mirror is critical to the optical performance of the tube, and how can I tell the correct alignment for EdgeHD1400?

Two weeks ago when I was trying to unthread the retaining ring from the secondary mirror of my EdgeHD1400 to use HyperSar in the field, I found the whole secondary mirror assembly unit was rotating against the corrector plate because it was loose. I did not remember how many revolutions they were as I kept rotating it in the dark till I found the problem, but ?the orientation must be already different from what it used be.

Going back home, I carefully removed the corrector plate from the tube and then unthreaded the secondary mirror assembly unit from the plate.

I saw a magic mark at the side of the secondary mirror (one line), and also two marks adjacent to each other at the inner side of the center hole of the corrector plate. Does it mean the mark of secondary mirror should be positioned between the two marks drawn in the corrector plate?

I found the guideline for the normal tube and that EdgeHD version may depend on the year of manufacture.

http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1655.&group=iframe

Thank you for your advice,

Yasushi

We had the same problem on the C14 Edge at the Mauna Kea VIS here in Hawaii. ?I talked to Dean at Starizona and he said the secondary notch may not be at the three o'clock position as some of the earlier models were, but the Fastar logo should be level with the scope horizontal. ?The secondary cover should be rotated to hide the collimation screws. ?When we did that, the notch was at the three o'clock position. ?You can tighten the secondary tube without removing the corrector plate, but it's tricky and works best with two people. ?You should get it as tight as you can by hand, but it will probably loosen again. ?Dean has an improved gasket that will solve the problem, but you must removed the corrector plate to install it.

Hope this helps.

Don

Thank you very much for the information. It really helps me with the next action.

Best Regards,

Yasushi