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Showcasing my planetary Dall Kirkham telescope

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#1 PiotrM

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Posted 17 November 2018 - 11:37 PM

Long overdue telescope presentation: https://rk.edu.pl/en...kham-telescope/

dk_setup.jpg

Also note that I moved my site from rkblog.rk.edu.pl to just rk.edu.pl - with SSL and other improvements. Old links redirect to the new ones.
  • Wouter D'hoye, PrestonE, John Boudreau and 14 others like this

#2 bobito

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Posted 18 November 2018 - 12:04 AM

That's is quite a project!  I am impressed that you were able to get the weight under a C14.



#3 Astrojensen

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Posted 18 November 2018 - 03:00 AM

Awesome! Some good thinking went into that design. 

 

 

Clear skies!
Thomas, Denmark



#4 Pyrodav

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Posted 18 November 2018 - 05:57 PM

Very nice! 



#5 Kokatha man

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Posted 18 November 2018 - 06:47 PM

Look forward to seeing what you might be able to do with this down the track Piotr! waytogo.gif

 

Apart from other unwieldy experiments with Newts that aren't very transportable I did entertain something similar, but it would have had to been significantly bigger than a C14 personally...& the money involved would have been prohibitive...I'm probably too old now anyway! :lol:

 

I would be interested to know just what this instrument cost you in euros, US dollars or Martian shekels..? ;)



#6 TonyStar

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Posted 18 November 2018 - 07:24 PM

Very nice scope Piotr, your arguments about the limitations of the SCT design are sound. 

 

I'm a bit surprised you mounted a GSO focuser on this beauty, it deserves a Feathertouch IMO.

How thick is the primary mirror? No forced air cooling ???

In the thermal images the front of the mirror appears cooler than the trusses, which is an artefact due to the low emissivity of the aluminum coating. Have you looked at the back of the mirror as it cools?

Did you measure the Strehl ratio?


Edited by TonyStar, 18 November 2018 - 07:40 PM.


#7 PiotrM

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Posted 18 November 2018 - 08:56 PM

I'm a bit surprised you mounted a GSO focuser on this beauty, it deserves a Feathertouch IMO.

Maybe later. It can be swapped for other SCT-related focusers. It has to also have a planetary-oriented motofocuser.

How thick is the primary mirror? No forced air cooling ???

No cooling at the moment. If needed it can be put on the back. I don't have exact mirror thickness right now but it's not a thick and heavy one. In total the OTA is less than C14.

In the thermal images the front of the mirror appears cooler than the trusses, which is an artefact due to the low emissivity of the aluminum coating. Have you looked at the back of the mirror as it cools?

Also things may reflect temperature of other things. I'll likely need a movie to get a "full picture" and hoping the camera won't re-calibrate/re-scale during recording. Metal parts can appear cooler, CF warmer.

Did you measure the Strehl ratio?

Not yet smile.gif

#8 troyt

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Posted 18 November 2018 - 09:34 PM

This telescope looks cool and you have some good images captured with it already. waytogo.gif




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