Quote:
Originally Posted by blink138
any help or advice is great ted!
pat
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Quote:
Originally Posted by blink138
thanks for trying this for me ted, the first pic i posted was to show the blurry laser reflection with the black hole centre at top, we did actually get it centred ok, but was wondering if the blurry laser may have something to do with all three laser images no all coming together on the screen at the back
we will go around to peters place (stardrifter) again and brian norsdrum may attend also, so maybe we can nut it out
BTW ted does your whole secondary housing rotate within the corrector if you turn it?
regards
pat
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No problems Pat. Over the years I have had 3 C11s and all the secondary holders have rotated over the years.
Now that I am thinking about in my experience, the centre hole cut in the corrector plate can be substantially oversized. What this means is that when the sandwich coupling between the back section on the inside and the outer section of the secondary holder loosens, the whole assembly of the secondary mirror holder not only rotates but also slips under gravity i.e. it can become substantially de-centered and not optically co-aligned with the mechanical axis.
I think as a starting point I would get a pair of calipers to check centration of the secondary housing. If it is not centered, it means it has slipped. The secondary assembly will need to be tightened so it stays in position on the corrector, otherwise moving the scope about the sky will make it shift again. Once secondary assembly is tightened, the whole corrector plate must be adjusted to ensure the secondary is re-centered. Note before removing the corrector check for corrector position/orientation points, refer to your manual.
Ted