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Equipment Discussions >> ATM, Optics and DIY Forum

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plyscope
Pooh-Bah


Reged: 11/23/06

Loc: Perth, West Australia
Schiefspiegler kit, anyone tried it? new
      #5789867 - 04/10/13 09:45 AM

This is a new telescope in kit form available from Europe. A long focal length unobstructed reflector, 110/3000mm.

Has anyone tried it?

web page


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RodgerHouTex
Pooh-Bah
*****

Reged: 06/02/09

Loc: Houston, Texas, USA
Re: Schiefspiegler kit, anyone tried it? new [Re: plyscope]
      #5789902 - 04/10/13 10:04 AM

Pretty interesting. I have always wanted to build a Schiefspiegler but never could find the time. Plus I would want something in the 6/8 inch range with the tilted lenses which improve the optical characteristics.

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philipdo
sage


Reged: 12/06/06

Loc: Flanders, Belgium, Europe
Re: Schiefspiegler kit, anyone tried it? new [Re: RodgerHouTex]
      #5789955 - 04/10/13 10:38 AM

Nice initiative. As I understood from a posting by the owner of the company on the Yahoo TCT forum, only the optics and a construction manual are included. So you have to buy materials and make the OTA yourself.

philip


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JohnH
Carpal Tunnel
****

Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: Schiefspiegler kit, anyone tried it? new [Re: philipdo]
      #5790255 - 04/10/13 12:47 PM

There are a NUMBER of TCT designs available in books and on websites where the maker describes all the problems and solutions.

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ccaissie
professor emeritus


Reged: 09/13/10

Loc: Whitefield, Maine
Re: Schiefspiegler kit, anyone tried it? new [Re: JohnH]
      #5791889 - 04/11/13 08:20 AM

As much as I love the 4.25 Kutter Schief we have in the club made by Norm Meyer, I think 445 euros is steep for a couple of small optical pieces.

Some of the ATM opticians here could do better, I'd think.

The popularity of f/20-24 Schiefs in Europe must be based in the bright sky background from light pollution.


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Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: Schiefspiegler kit, anyone tried it? new [Re: ccaissie]
      #5791943 - 04/11/13 09:00 AM

"Some of the ATM opticians here could do better, I'd think."
**********
And stay in business, pay taxes, and put beans (not steaks) on the table?
Try it, sometime!
M.


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StarDusty
sage


Reged: 10/02/07

Loc: Parsippany, NJ
Re: Schiefspiegler kit, anyone tried it? new [Re: Mark Harry]
      #5791970 - 04/11/13 09:18 AM

I made a Schiefspiegler with the help of Dave and the others at the yahoo group:

http://tech.groups.yahoo.com/group/schiefbuilders/

You can read more about this project on my website here:

http://www.clearskyobserver.com/index.php/component/content/article/20-telesc...


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plyscope
Pooh-Bah


Reged: 11/23/06

Loc: Perth, West Australia
Re: Schiefspiegler kit, anyone tried it? new [Re: StarDusty]
      #5792964 - 04/11/13 05:52 PM

Thanks for showing your Schiefspiegler Allen, good website!

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Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Schiefspiegler kit, anyone tried it? new [Re: plyscope]
      #5793181 - 04/11/13 07:56 PM

$583 not including shipping for:

-Optical Elements
-Image quality certificate
-Assembly documentation
-Technical support

for a 4.25in f28



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DAVIDG
Post Laureate
*****

Reged: 12/02/04

Loc: Hockessin, De
Re: Schiefspiegler kit, anyone tried it? new [Re: Pinbout]
      #5793304 - 04/11/13 09:27 PM Attachment (32 downloads)

It cost me about $75 to build mine and about $40 of that was to have the mirrors coated. All the plans are on Schiefbuilders yahoo group.

- Dave


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RodgerHouTex
Pooh-Bah
*****

Reged: 06/02/09

Loc: Houston, Texas, USA
Re: Schiefspiegler kit, anyone tried it? [Re: DAVIDG]
      #5794089 - 04/12/13 10:14 AM

Dave,

Very nice looking scope.


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ccaissie
professor emeritus


Reged: 09/13/10

Loc: Whitefield, Maine
Re: Schiefspiegler kit, anyone tried it? new [Re: RodgerHouTex]
      #5794836 - 04/12/13 04:20 PM

If that's the one I looked through at Stellafane back in '05 or so, it's a stupendous scope. However our club member Lennie took the optics award that year. I thought the view of Mars in it was as good as the view in the winning 6" Newt.

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DAVIDG
Post Laureate
*****

Reged: 12/02/04

Loc: Hockessin, De
Re: Schiefspiegler kit, anyone tried it? new [Re: ccaissie]
      #5795055 - 04/12/13 05:44 PM Attachment (19 downloads)

Quote:

If that's the one I looked through at Stellafane back in '05 or so, it's a stupendous scope. However our club member Lennie took the optics award that year. I thought the view of Mars in it was as good as the view in the winning 6" Newt.



Thank you, the optical performance is excellent in a Delmarva Schiefs. Yes it was displayed at Stellafane in 2005, it also won first that year in the optical judging for "complex optics".

- Dave

Edited by DAVIDG (04/12/13 05:47 PM)


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kfrederick
Carpal Tunnel
*****

Reged: 02/01/08

Re: Schiefspiegler kit, anyone tried it? new [Re: DAVIDG]
      #5795104 - 04/12/13 05:53 PM

Dave Is there a reason the secondary RC is the same as the primary other than the ease of build . Would a different RC be better . Nice pic ever use the telescope behind you?

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DAVIDG
Post Laureate
*****

Reged: 12/02/04

Loc: Hockessin, De
Re: Schiefspiegler kit, anyone tried it? new [Re: kfrederick]
      #5795173 - 04/12/13 06:26 PM

Kevin,
You might be able to tease out a little better optical performance by going with a different radius on the secondary. Then you give up the fact that the tool used to grind the primary becomes the secondary and the primary mirror when figured to the needed sphere becomes the test plate for the secondary. One main reason why this design gives the outstanding performance that it does, is that both surfaces are spheres and have same radii so the primary can be nulled tested with the simplest of equipment, and then used as a test plate to figure the secondary. The result is that the average ATM has a real good chance of making the optics to a level of perfection that the performance of the scope will be what theory shows it can.

- Dave


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Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: Schiefspiegler kit, anyone tried it? new [Re: DAVIDG]
      #5796087 - 04/13/13 07:39 AM

I investigated this; and it's possible to "tease" it a bit better. And, change the position of the focus so as to use a lower mount position, etc. Generally a shorter radius on the secondary does the latter, and it would be slightly easier to accomodate a bit more aperture. But as is, the simplicity of Dave's wonderful example, and ease of testing/fabricating has a lot going for it.
M.


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Dan McConaughy
sage


Reged: 11/11/06

Loc: LA
Re: Schiefspiegler kit, anyone tried it? new [Re: Mark Harry]
      #5796094 - 04/13/13 07:57 AM

I made a number of schiefspieglers a long time ago. The 4.25" is a pain because the mirrors are so small. You can make a 6" f/29 kutter that is easier to make. It's long but works well. The Buchroeder trischiefs work well and you can get some aperture - put one on a dobsonian mount with a drive and you are all set for observing sitting down.

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Gary Fuchs
Pooh-Bah
*****

Reged: 05/22/06

Loc: Easton, PA, USA
Re: Schiefspiegler kit, anyone tried it? new [Re: plyscope]
      #5796506 - 04/13/13 12:00 PM

Here's my Delmarva Schief at Stellafane (2nd place tie for optics):



This design is proven, easy to build, and inexpensive. Most of mine was made from scrap yard pieces, but even if you buy everything new it's still not that much.





All the--simple--information you'd need to make one is available here, as well as help from a number of experienced members.

Gary

Edited by Gary Fuchs (04/13/13 12:01 PM)


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