Quote:
Originally Posted by mldee
Well Marc, Nice approach. Thanks for the very nice internal pics of the C11 rear assembly. I'm hoping to do something similar to my C8, but for different objectives. Your concept adds a lot of incentive.
You were the one who first got me interested in the Hyperstar approach to the Celestrons, and my scope is outside right now in Hyperstar mode busy on the Pleiades.
To cut a long story short, after the Hyperstar shooting season finishes in a couple of weeks, I intend to disassemble the OTA and put a similar type of assembly at the rear of the mirror to allow 3-point focussing via a rear-mounted Crayford and tube inside the baffle tube. Details at 11.
I wont go into gory details at this stage, but your effort has sure inspired me to push onwards with my mods. I think the older Celestrons are a really cost-effective machine amenable to such mods and experimentation.
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That's good to hear. A lot of the vintage scopes in the celestron range used to have various primary mirror mounting and most could be tilted. Something that got lost down the road and the assembly line, primarily because people didn't understand how to collimate them. You have to start the other way round with the secondary and do the primary last, not unlike the iterative procedure of a newt. I suspect also it brought cost down dramatically.
Quote:
Originally Posted by DavidTrap
I'll bite - why do you need to tilt a spherical mirror?
DT
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Hi David, having the ability to tilt both mirrors will allow you to always get them on axis regardless of how well centered they are.