Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Starizona SCT Corrector

  • Please log in to reply
44 replies to this topic

#26 bigol

bigol

    Lift Off

  • -----
  • Posts: 12
  • Joined: 17 Nov 2010
  • Loc: Minsk, Belarus

Posted 20 September 2012 - 06:19 AM

Yes, I have C-11 XLT, not Edge-HD model. I tried additional 0.5mm spacer between corrector and adapter to increase backfocus, but coma only became worse. So, I still wait any answer from starizona guys and then I will look that it is possible to make.

#27 freestar8n

freestar8n

    Vendor - MetaGuide

  • *****
  • Vendors
  • Posts: 9,334
  • Joined: 12 Oct 2007

Posted 20 September 2012 - 06:50 AM

Well if an increase of 0.5mm really made it noticeably worse, then 2mm in the other direction (shorter) might make it much better. I realize it isn't easy to shorten the spacing - but at least it points to a way to make the corrector work.

Frank

#28 sullij1

sullij1

    Surveyor 1

  • -----
  • Posts: 1,606
  • Joined: 08 Nov 2008

Posted 20 September 2012 - 10:17 AM

Wow, that image is not gonna sell a lot of those correctors! :shocked: At this point I am glad I waited! :smirk:

#29 bigol

bigol

    Lift Off

  • -----
  • Posts: 12
  • Joined: 17 Nov 2010
  • Loc: Minsk, Belarus

Posted 20 September 2012 - 12:02 PM

I hope it not final result. It is necessary to correct something. :)

#30 MikeML

MikeML

    Viking 1

  • *****
  • Posts: 515
  • Joined: 09 Oct 2004
  • Loc: NJ

Posted 03 October 2012 - 07:44 PM

Wow, that image is not gonna sell a lot of those correctors! :shocked: At this point I am glad I waited! :smirk:


Bought one early this year and finally used it on all 3 of my SCTs and My QSI583wsg. A little pincushion on the 11 and 6 inch SCTs, round stars all the way to the corners of the 8". The pincushion is relatively easy to correct (at least compared to the distortion I got with my old Meade corrector). For me, its a keeper. :)

#31 bigol

bigol

    Lift Off

  • -----
  • Posts: 12
  • Joined: 17 Nov 2010
  • Loc: Minsk, Belarus

Posted 05 October 2012 - 04:42 AM

Sounds great, MikeML. I got a response from starizona.com. They agree to replace my corrector. Now I'm trying to find in my city man with SCT to verify exactly what the cause of poor performance of the corrector.

#32 MikeML

MikeML

    Viking 1

  • *****
  • Posts: 515
  • Joined: 09 Oct 2004
  • Loc: NJ

Posted 05 October 2012 - 02:31 PM

Here's a shot from the 11"(I really must check my collimation more often) and a full size of the lower RH corner which showed the most distortion.

Attached Thumbnails

  • 5456744-M76R016.jpg


#33 MikeML

MikeML

    Viking 1

  • *****
  • Posts: 515
  • Joined: 09 Oct 2004
  • Loc: NJ

Posted 05 October 2012 - 02:32 PM

And the lower RH corner at full size

Attached Thumbnails

  • 5456745-M76R016crop.jpg


#34 bigol

bigol

    Lift Off

  • -----
  • Posts: 12
  • Joined: 17 Nov 2010
  • Loc: Minsk, Belarus

Posted 06 October 2012 - 12:59 AM

Looks good for "most distortion".
However, you use a monochrome camera, and I - canon 1000D. Did you shoot with the L-filter? Or color?

#35 MikeML

MikeML

    Viking 1

  • *****
  • Posts: 515
  • Joined: 09 Oct 2004
  • Loc: NJ

Posted 06 October 2012 - 05:33 AM

The frame shown is a single Red frame I just grabbed at random, stretched and contrast increased. I think it looked worse before I increased the contrast

#36 bigol

bigol

    Lift Off

  • -----
  • Posts: 12
  • Joined: 17 Nov 2010
  • Loc: Minsk, Belarus

Posted 10 October 2012 - 10:55 AM

Then our comparison isn't absolutely correct. In different channels the image looks differently if to shot with the color camera. If to shot the monochrome camera and to be focused in each channel separately, the result turns out better.

#37 MikeML

MikeML

    Viking 1

  • *****
  • Posts: 515
  • Joined: 09 Oct 2004
  • Loc: NJ

Posted 10 October 2012 - 11:49 AM

Then our comparison isn't absolutely correct. In different channels the image looks differently if to shot with the color camera. If to shot the monochrome camera and to be focused in each channel separately, the result turns out better.


I'm not seeing any change between filters, my focus with the different filters is essentially the same through the SCT.

#38 bigol

bigol

    Lift Off

  • -----
  • Posts: 12
  • Joined: 17 Nov 2010
  • Loc: Minsk, Belarus

Posted 10 October 2012 - 06:19 PM

So, could you show any corner with L,R,G,B filters without refocusing? Thank you.

#39 bigol

bigol

    Lift Off

  • -----
  • Posts: 12
  • Joined: 17 Nov 2010
  • Loc: Minsk, Belarus

Posted 21 October 2012 - 12:42 PM

In the end, I got a good result. But it works with longer adapter - 96mm instead of 90.3 mm.
Perhaps my copy of the SCT-corrector has the features or site www.starizona.com incorrectly indicates the optimal distance from the SCT-corrector to the matrix. I can check it out at the end of November, when I get a new corrector for replacement.

Attached Thumbnails

  • 5481974-IC5146-005colorg36_2.jpg


#40 JavierV

JavierV

    Lift Off

  • *****
  • Posts: 20
  • Joined: 31 Oct 2012
  • Loc: Texas

Posted 04 November 2013 - 07:15 PM

Hello Bigol,
Did you receive your corrector replacement?, If So, how it is?.
thank you
Javier.

#41 astro_77733

astro_77733

    Lift Off

  • -----
  • Posts: 10
  • Joined: 27 Jan 2014

Posted 28 January 2014 - 02:59 AM

TSSCKorr makes a .8 telecompressor/corrector for sct's, see teleskop services. It's image circle is smaller then the starizona (30mm versus 35mm)and it's it's at .8 versus .75

Optec also makes a .5 with a smaller image circle

#42 mvas

mvas

    Apollo

  • -----
  • Posts: 1,337
  • Joined: 27 May 2015
  • Loc: Eastern Ohio

Posted 20 July 2016 - 12:51 PM

In the end, I got a good result. But it works with longer adapter - 96mm instead of 90.3 mm.
Perhaps my copy of the SCT-corrector has the features or site www.starizona.com incorrectly indicates the optimal distance from the SCT-corrector to the matrix. I can check it out at the end of November, when I get a new corrector for replacement.

That image does look like a good result.

Are you still using your Starizona SCT Coma Corrector?



#43 DuncanM

DuncanM

    Mercury-Atlas

  • -----
  • Posts: 2,987
  • Joined: 03 Nov 2009
  • Loc: Arizona Sky Village or the rain forest

Posted 20 July 2016 - 05:43 PM

 

In the end, I got a good result. But it works with longer adapter - 96mm instead of 90.3 mm.
Perhaps my copy of the SCT-corrector has the features or site www.starizona.com incorrectly indicates the optimal distance from the SCT-corrector to the matrix. I can check it out at the end of November, when I get a new corrector for replacement.

That image does look like a good result.

Are you still using your Starizona SCT Coma Corrector?

 

There's lots of images with the Starizona SCT reducer on Astrobin. I have the older F7.5 version and off axis stars look very good on my 10In F10 SCT but I haven't had a chance to do any imaging with it. 



#44 FirstC8

FirstC8

    Apollo

  • -----
  • Posts: 1,118
  • Joined: 10 Mar 2016

Posted 25 July 2016 - 10:28 PM

DuncanM,

You mentioned the Starizona F6.3 can be screwed into some autofocuser. Do you have a picture how it works?

At 90mm, or even 96mm this corrector's backfocus is too small for a full set of OAG, FW, camera and autofocuser, but if it can be fitted inside the focuser it may work.

As far as value, if one already has a std C8, then this Starizona corrector at $400 definitely can be appealing, if the short backfocus works out.

#45 DuncanM

DuncanM

    Mercury-Atlas

  • -----
  • Posts: 2,987
  • Joined: 03 Nov 2009
  • Loc: Arizona Sky Village or the rain forest

Posted 26 July 2016 - 02:20 AM

DuncanM,

You mentioned the Starizona F6.3 can be screwed into some autofocuser. Do you have a picture how it works?

At 90mm, or even 96mm this corrector's backfocus is too small for a full set of OAG, FW, camera and autofocuser, but if it can be fitted inside the focuser it may work.

As far as value, if one already has a std C8, then this Starizona corrector at $400 definitely can be appealing, if the short backfocus works out.

Using the correct adapter the Starizona SCT FR will thread onto the scope side of a Lumicon NEG OAG and the total BF with a T-ring works out to about 90mm or a bit more (95mm?), IIRC.  Unfortunately my SCT FR and OAG are not at my present location.


Edited by DuncanM, 26 July 2016 - 02:21 AM.



CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics