Quote:
Originally Posted by Atmos
Hey Alan,
Just had another look, the hex screws I don't believe are for collimation as they sit a ways below the lens cell. The whole section around the lens cell is plastic. I believe the lens cell (plastic) screws into that plastic end section (plastic) which is bolted onto the metal tube with 3 hex bolts.
I haven't been game to unscrew anything yet.
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Hi Colin,
Yes, those are simply for securing the lens-cell to the optical-tube. I usually see cross-head screws for that. The heads of screws for collimating a refractor are usually forward-facing. I have only one refractor with that type...
https://i.imgur.com/2naBDnI.jpg
I am surprised, however, that hex-screws were used. That's usually indicative of higher quality. Also, within your first image, the three shiny spacers for the doublet-lens are reminding of the refractors of Vixen of Japan, although they have outsourced to China over the years; also, the bluish sheen of the doublet.
Getting back to the focusser, at the rear, it appears to be of metal.
In any event, an unobstructed 3" of aperture is worth the while, especially at a longer focal-length as that one. My congratulations still holds.