Jump to content


Photo

C8 Schmidt-Newtonian Frakenscope

  • Please log in to reply
111 replies to this topic

#101 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 25 September 2014 - 12:38 PM

Teaser - I got most of the new camera adapter (design 1 - no filter option) machined last night, and I'm planning on finishing it tonight.  Naturally, clouds are expected for the next 2 nights...

 

The C8 Hyperstar 3 camera end has adapter threads of 1.741 inches O.D. and 32 TPI.  Hopefully, I've measured that correctly.  I'll verify the fit and let you know.

 

Pictures when it's finished,

 

Michael


Edited by Michael Miles, 25 September 2014 - 12:39 PM.


#102 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 27 September 2014 - 04:16 PM

Hi folks:

 

OK, I got the Miles_Mark1 EOS-M/Hyperstar adapter finished and out last night for a test.  The Miles_Mark2 is under design as an improvement of the Mark1 with the addition of the ability to use a 2" filter.  I'm working on a way to jury-rig a filter into the Mark1 which requires removing the filter glass from the threaded ring (so not a permanent option).  I don't have metric thread gearing for my lathe, so I shrink fitted a 52mm filter body in the adapter (heated to 300F in the oven first).  So, here are some pictures of the Mark1 with the macro ring removed and installed on the Hyperstar:

Attached Files



#103 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 27 September 2014 - 04:21 PM

mounted on the Hyperstar:

Attached Files



#104 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 27 September 2014 - 04:29 PM

And a test shot at ISO 3200 and 6 seconds - non-tracked (so some trailing).  It does show that the asymmetric star patterns are no longer there, so I think the problem before was the kludged camera mount.  However, the star patterns are still a little weird, so I'm going to go through a process of re-aligning the optics in the telescope from top to bottom.  Vignetting is visible, and it's asymmetric, so that makes me think that the Hyperstar is not aligned on the telescope - other ideas?

 

Getting better all the time,  Michael 

Attached Files



#105 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 28 September 2014 - 03:32 PM

I took the scope out last night and took some astrophotos with the Zhumell Urban Sky filter.  I'll show some before/after pictures so you can see the difference from the old kludged camera adapter and the Mark1 camera adapter with the filter.  Here's what a 20 second ISO 3200 photo of M31 looked like before:

 

 

Attached Files



#106 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 28 September 2014 - 03:34 PM

and after balancing the color curves with the histogram peak at about 1/3:

 

 

Attached Files



#107 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 28 September 2014 - 03:36 PM

and M31 at ISO 3200 for 20 seconds with the Mark1 adapter and filter:

 

 

Attached Files



#108 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 28 September 2014 - 03:41 PM

and with the histogram color balanced with peak at 1/3 maximum:

 

 

Attached Files



#109 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 28 September 2014 - 03:53 PM

You can see that the star pattern asymmetry is much lower with the Mark1 adapter.  I'm feeling very encouraged at this point to continue with the Mark2 adapter and its filter holder.  However, I'm kinda burned out from the nightly efforts to get this working, so it may be a couple of weeks before the next upgrade.  At least I've shown that the EOS-M can be used with the Hyperstar on a C8.  Maybe Starizona will offer an EOS-M adapter if there's enough interest :) ...

 

I was able to lighten the ZEQ25 by removing one of the 5  pound counterweights and just using the stock weight.  Very happy about that.

 

Michael


Edited by Michael Miles, 28 September 2014 - 03:54 PM.


#110 drake

drake

    Ranger 4

  • -----
  • Posts: 307
  • Joined: 08 Nov 2008
  • Loc: Naples, Italy

Posted 29 September 2014 - 02:23 AM

congratulations on your tenacity and, to share this results with us.


  • m1618 likes this

#111 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 29 September 2014 - 11:04 AM

Thanks - I'm hoping I'll get to see other's modding their C8's too...



#112 Michael Miles

Michael Miles

    Apollo

  • -----
  • Posts: 1014
  • Joined: 11 Feb 2005

Posted 30 September 2014 - 12:52 PM

Here's a shot with the contrast turned way up to show the asymmetric vignetting.  I recentered the corrector plate, and will test it out tonight (clear skies :).

 

Michael

Attached Files








Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics