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Equipment Discussions >> ATM, Optics and DIY Forum

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LivingNDixie
TSP Chowhound
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Reged: 04/23/03

Loc: Trussville, AL
Buy a blank and... new
      #5518096 - 11/13/12 02:58 PM

... send it off to have someone figure it and then coat it?

I am asking because I was wondering if anyone has done this. What I would want done is not something that would be standard off the shelf.


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JohnH
Carpal Tunnel
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Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: Buy a blank and... new [Re: LivingNDixie]
      #5518193 - 11/13/12 03:56 PM

Define "off the shelf".

Optical designs by non-professionals have come a great distance, mostly because sophisticated software and the internet allows people to come up with new (and greatly modified old) designs and share expertise gains at the expense of dozens of hours of work

Ask, and yea shall receive.


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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: Buy a blank and... new [Re: LivingNDixie]
      #5518254 - 11/13/12 04:33 PM

Quote:

... send it off to have someone figure it and then coat it?






are you going to grind and polish it before you send it to get figured?


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Mike I. Jones
Post Laureate
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Reged: 07/02/06

Loc: Fort Worth TX
Re: Buy a blank and... new [Re: Pinbout]
      #5518436 - 11/13/12 06:13 PM

Preston,
What are your desired mirror parameters?
Mike


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LivingNDixie
TSP Chowhound
*****

Reged: 04/23/03

Loc: Trussville, AL
Re: Buy a blank and... new [Re: Mike I. Jones]
      #5518606 - 11/13/12 08:00 PM

Quote:

Preston,
What are your desired mirror parameters?
Mike




Hi Mike,

I was going to do a 4in f/10 just like the scope in Build Your Own Telescope. Of course I would do a few things a little different such as buying a focuser and secondary holder instead of building them.

However I have been going through my small stash of Amateur Astronomy magazines and I found a design that Tom Clark did quite a few years back for an 8in f/6 travel scope, and that seems a little more appealing and 8in mirrors would be easier to come across. I could even scale it down to 6in f/8 to save a little in cost.

I have been wanting a smaller grab and go scope for a while, and I was somewhat set on a 4in refractor from Explore Scientific but after playing with a dob last Saturday I am wanting one. I am not crazy about the current dobs from Orion etc and figure why not build one to my tastes. I figure I could source GSO for the optics, but I am not crazy about metal tubes.

Granted I have never built a scope though... I am thinking a budget of 500 to 600 for everything...


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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: Buy a blank and... new [Re: LivingNDixie]
      #5518869 - 11/13/12 11:01 PM

what about this 10in f4.5? Don usually has nice mirrors for cheap, he may still have it. its the second mirror in the ad

http://www.cloudynights.com/classifieds/showproduct.php?product=63146&sor...


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LivingNDixie
TSP Chowhound
*****

Reged: 04/23/03

Loc: Trussville, AL
Re: Buy a blank and... [Re: Pinbout]
      #5519553 - 11/14/12 01:39 PM

Quote:

what about this 10in f4.5? Don usually has nice mirrors for cheap, he may still have it. its the second mirror in the ad

http://www.cloudynights.com/classifieds/showproduct.php?product=63146&sor...




Wow that is a nice price.


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