250mm f/10 Stevick-Paul

[johninderby]

You do enjoy the challange of building something out of the ordinary. 👍🏻👍🏻👍🏻

Hope it all goes according to plan. 🙂

[carastro]

Amazing project I look forward to seeing the final results.

Carole 

[steppenwolf]

I love this, something really different ....

[Gina]

I love things that are different.  😁

[Stu]

On 31/12/2019 at 21:03, Gina said:

Maybe I won't build one then 🤣

Please don't Gina, I'm not sure my blood pressure would benefit 😉😉🤣🤣

[Chriske]

Thanks to you all for the support and the kind words..😉

[Chriske]

The 'tube' of this scope will be made out of 18mm plywood.
The odd shaped side-panels will be made with a Maslow.
These panels will be made very accurately.  I expect their shape will be well within a millimetre correct. So when the mirror cells are all mounted in the tube, the mirrors to be almost at the correct location, requiring only a minimum of collimation.

[hamishbarker]

Did your Stevick-Paul get completed? I just completed a 160mm f15 version. (I had a very long focus primary, but anyway had to refigure it as it had shocking astigmatism which I only discovered on assembly of the telescope. I made my own convex secondary and concave tertiary. All coatings apart from the quaternary flat are silver, for best reflectivity.

 

I did some investigation with the OSLO-edu optics software and it appears that tolerances for focal length and spacing along the optical path are actually quite loose. It's just the angles which are a bit more critical. Collimation has gone quite well and i get nice views but at 160mm aperture it's no light bucket. Mine has a tube for the secondary/tertiary/quaternary mirrors and focuser, while the primary is slung below the tube via a hexapod truss allowing both angle and position adjustments. I have a thread over on the ATM section of the big other astronomy forum starting with C.

Edited February 7 by hamishbarker