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Equipment Discussions >> ATM, Optics and DIY Forum

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JohnH
Carpal Tunnel
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Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: Gord]
      #5663273 - 02/05/13 10:22 AM

This is a variation of the "Solid Cat" Vivitar 800mm f/11 which used the same principle, except a larger scale.

Its advantage was it would never fall out of collimation, not without a force large enough to shatter the glass or metal housing.


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Stipe Vladova
super member


Reged: 10/08/10

Loc: Split, Croatia
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: rik ter horst]
      #5663297 - 02/05/13 10:33 AM

Take some photos thru the scope!

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rik ter horst
sage


Reged: 11/01/10

Loc: Ewer, the Netherlands
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: JohnH]
      #5663717 - 02/05/13 02:54 PM Attachment (96 downloads)

Thanks all for your enthusiasm!

Gord, it actually fits INSIDE an eyepiece and it might be used as a finder. The field of view is limited however, so it will not make a perfect finder. For that purpose a larger diameter would be required.

John, thanks for this this interesting comment! I didn't know this Vivitar lens so after some googling I found that the optical configuration of the Vivitar consists of several (bonded) components with different refractive indices and with some air gaps. For comparison below the layout of the 30mm Solid SCT which is made from just one piece of BK7, no bonding whatsoever...
The baffles are not displayed in the plot.

Vladova, hopefully I can do some 'astronomical imaging' during the next weekend!
If I have something to show I'll post it here.


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ahopp
sage


Reged: 05/24/12

Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: rik ter horst]
      #5663785 - 02/05/13 03:33 PM

When I said earlier that "I want one" I was not just saying it:

"I WANT ONE, please'

Tony


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rik ter horst
sage


Reged: 11/01/10

Loc: Ewer, the Netherlands
Re: A SOLID 30 mm F/10 Schmidt Cassegrain [Re: ahopp]
      #5663808 - 02/05/13 03:47 PM

Sorry Tony! So you're actually asking me to make one for you? Ehh.... I'm very flattered! Let me think about it for a while, and I'll answer you by PM. Is that ok for you?

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ahopp
sage


Reged: 05/24/12

Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: rik ter horst]
      #5664404 - 02/05/13 10:04 PM

Quote:

Sorry Tony! So you're actually asking me to make one for you? Ehh.... I'm very flattered! Let me think about it for a while, and I'll answer you by PM. Is that ok for you?




Yes, contact me via PM, very interested in what you have done.

Tony


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StarStuff1
Post Laureate
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Reged: 04/01/07

Loc: South of the Mason-Dixon Line
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: ahopp]
      #5664492 - 02/05/13 11:31 PM

At first I thought there was a typo and the title should have said "A SOLID 300mm....."

Wow!

Barry Crist of b. crist miniatures could probably make you an appropriate sized mount and tripod.


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Astrojensen
Post Laureate
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Reged: 10/05/08

Loc: Bornholm, Denmark
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: StarStuff1]
      #5664635 - 02/06/13 03:40 AM

Quote:

Barry Crist of b. crist miniatures could probably make you an appropriate sized mount and tripod.




Actual working 1:10 scale model of a 12" f/10 Meade LX200 SCT, with GOTO and Superwedge...




Clear skies!
Thomas, Denmark


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Darenwh
Carpal Tunnel


Reged: 05/11/06

Loc: Covington, GA
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: Astrojensen]
      #5664787 - 02/06/13 08:19 AM

Well, I think I can stop coming to the ATM thread now. I don't think anybody's going to top this one. Great job...

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rik ter horst
sage


Reged: 11/01/10

Loc: Ewer, the Netherlands
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: Darenwh]
      #5665383 - 02/06/13 02:22 PM

@ Vladova, well, I just discovered a very practical problem: The BFL of the little scope is too short to be able to focus with my DBK21 camera. I could make images at shorter distances however, so whenever I have something to show I'll post it here....

@ Thomas, I agree, it should have goto! Always easy when observing faint distant galaxies ;-)

@ Daren, Many thanks! But.... there are so many creative telescope makers out there, making incredible instruments in all kinds of types, dimensions and quality, I wouldn't stop visiting the ATM threads!


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maroubra_boy
professor emeritus


Reged: 09/08/09

Loc: Sydney, Australia
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: GlennLeDrew]
      #5665634 - 02/06/13 04:43 PM

Quote:

Bloody awesome!




Just what Glenn said!



And I thought my C5 was cute - stand aside C5, there's a new kid on the block

Alex.


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tim53
Postmaster
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Reged: 12/17/04

Loc: Highland Park, CA
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: maroubra_boy]
      #5665667 - 02/06/13 05:04 PM

This is neat. What is the actual size of the focal plane. Many machine vision cameras have ccds on the order of 1/4" diagonally. If your focal plane is about that big, it might not make a bad e-finder at all! Just make a C-mount thread for it to screw right on the front of the camera.

-Tim.


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Dick Jacobson
scholastic sledgehammer


Reged: 12/22/06

Loc: Plymouth, Minnesota, USA
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: rik ter horst]
      #5666676 - 02/07/13 09:10 AM

If you look through it backwards, does it work as a magnifier?

I agree with everyone, this is AWESOME! Just the right size for Barbie and Ken.


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ZeroID
sage


Reged: 04/21/10

Loc: Auckland, New Zealand
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: Dick Jacobson]
      #5667676 - 02/07/13 07:07 PM

And I thought the Hubble scope was clever .... !!
Amazing work.


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kw6562
Authoritative Ignoramus
*****

Reged: 06/25/08

Loc: MA
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: ZeroID]
      #5668202 - 02/08/13 12:42 AM

That is such a cool idea! Great job!

It reminds me of some catadioptric microscope objectives that I bought for a project at work a few years ago: Newport objectives

--Keith


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rik ter horst
sage


Reged: 11/01/10

Loc: Ewer, the Netherlands
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: kw6562]
      #5670946 - 02/09/13 03:55 PM

Thank you all!
@Tim, in the first solid cas (shown here) a 1/4 inch ccd could be used although it suffers from field curvature. I've made a new design not so long ago which has a flat useful focal plane of at least 8 x 8 mm and a larger back focal distance. I hope to be able to make it soon.
@Dick, when using it backwards the obstruction makes it kind of useless unfortunately. What is possible however is to use it as a long distance microscope, from 1 meter distance and further....
@Keith, yes you're right, the dimensions are quite comparable. Optically it is a different story, but the microscope objectives you mention are interesting indeed!

Maybe we should ask Barbie and Ken what eyepieces they prefer.
Anyone out there wanting to make a 1.3 mm Ethos?? :-)


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azure1961p
Postmaster
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Reged: 01/17/09

Loc: USA
Re: A SOLID 30 mm F/10 Schmidt Cassegrain new [Re: Gord]
      #5671152 - 02/09/13 06:18 PM

I'm beside myself. I thought for sure your 30mm was a typo for 300mm. Awesome, kudos and all that.

Pete


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