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Newtonian Camera?

ATM astrophotography EAA imaging
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27 replies to this topic

#26 MitchAlsup

MitchAlsup

    Aurora

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Posted 18 September 2020 - 04:41 PM

https://www.jtwastro...ucts/telescopes

 

look at the prime focus newtonian section

Pedantic mode=on::

 

To be a Newtonian, one needs a secondary mirror and the focal plane off to the side of the entrance pupil.

 

What is labeled Prime Focus Newtonian is simply a prime focus paraboloid.



#27 JM La Galette

JM La Galette

    Vostok 1

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Posted 25 September 2020 - 01:05 PM

Greetings,
Has anyone ever built what I'll call a Newtonian camera?


Yes I started such a project in 2009 and it came to an end beginning of this year... I enjoy it every week (well, month...).
It is a 16" Newtonian, prime focus then. Spider assembly / focuser from Axis Instruments: http://www.axisinstruments.com/

The full story is here, in french but a lot of pictures: https://www.webastro...-astronomiques/

The home made tube with prime focus (3" Wynne corrector), here with an A7S (Ascom driver + wifi, so easy):
5dead3526e722_tube2.jpg.d759d5250e0649b2

Tube%20oct%202013.JPG

And with a STL11K:
POSTLvueinterieure.JPG


Latest image here: http://www.astrosurf...narrowband-hoo/

Of course I cannot look at the eyepiece, but except this I can't see any other problem. Warm air from the camera is not seen at all (or it does not affect the performance I would say, or I can't see it...), A7s or STL the same. Easier built, easy to set-up, easier collimation, full illumination, no loss of light due to secondary, lighter OTA...

I would say 14" is a minimum to benefit from the prime focus, smaller scope would probably have a too high central obstruction I guess. However the new CMOS cameras all come with a cylindrical aspect that may well help in such a design.

Go for it !

JMarc

Edited by JM La Galette, 25 September 2020 - 02:05 PM.

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#28 hukhound

hukhound

    Lift Off

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Posted 25 September 2020 - 05:20 PM

Very impressive and inspiring JMarc!!  Thank you for sharing.  I hope more commercial products with this approach will come in the future. It seems to be a cost effective autograph with some clear advantages. 


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