61 replies to this topic

[ahopp]

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

[StarStuff1]

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.

[Astrojensen]

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

[Darenwh]

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...

[rik ter horst]

@ 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!

[maroubra_boy]

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.

[tim53]

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.

[Dick Jacobson]

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.

[ZeroID]

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

[kw6562]

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

[rik ter horst]

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?? :-)

[azure1961p]

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

Pete

[Jon Isaacs]

I just happened on this thread.. As Glenn said, Bloody Awesome. I believe there are designs in Sidgwick for solid Cassegrains but to actually make one..

 

Jon

[macdonjh]

Has Rod Molise included it in his SCT book yet?  Some one should tell him about it.  His book is no longer complete.

[photiost]

One of a kind !! 

[saemark30]

A pocket sized SCT!

Do you happen to have an OSLO or ZEMAX file of the little 30mm or 40mm SCT?

If I was to make one though I would want it to fit a 2" eyepiece so maybe it can be 48mm or so aperture?

[diglit]

W.O.N.D.E.R.F.U.L.

 

One of the best telescopes I've seen.

 

CLAP CLAP CLAP

 

Paolo

[mikey cee]

Great I wondered how and who would come up with the first trend against aperture fever! Yesireeee the next craze for sure!         Mike

[woodscavenger]

Is that grab and go, grab and lose, or grab and drop and say where did it go?

 

Make two for bino viewing!!

 

Keychain for sure.  

 

We all want one.   How about a group buy?  Quit your job and start grinding glass.

[steveastrouk]

This is exceptional craftsmanship, even in the world of ATM. Beautiful work, I am awestruck.

Its when you click on the raytrace diagram, and realise its larger than real-life on a laptop screen.....

Edited by steveastrouk, 02 May 2015 - 09:07 AM.

[gdd]

A pocket sized SCT!
Do you happen to have an OSLO or ZEMAX file of the little 30mm or 40mm SCT?
If I was to make one though I would want it to fit a 2" eyepiece so maybe it can be 48mm or so aperture?

Aperture fever?

Gale

[Ed D]

A miniature achromat or Newtonian would have been intricate and hard enough.

 

A working 30mm SCT?  W O O O W !    

 

I also thought the '30mm' was a typo.

 

Ed D

Edited by Ed D, 02 May 2015 - 03:43 PM.

[tjay]

This is super cool.  I'd love to know how much they would cost...

[Mike I. Jones]

Rik's mini-SCT got me curious about these miniature designs as well.  This design is a quick 30mm f/6 SCT made from fused silica I did in Zemax, but keyed into OSLO-EDU for those interested.  It's a little different than Rik's in that the rear surface is one continuous spherical surface, without the spherical dimple ground and polished into it.  The front surface is a simple 4th order aspheric but still has the central dimple.

 

Interesting design space to explore, thanks Rik!

Mike

 

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[M.J.P.Meiling]

Is this the Rik Ter Horst from Opticon-fame in the 1980´s.
Who made the SCT´s in Holland back in the day??