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Solar Filter for Celestron SCT

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#1 Moonstruck

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Posted 29 April 2014 - 08:47 PM

A solar filter for the Celestron 8SE telescope can easily be made using a replacement dust cover, a 12" diameter piece of Masonite or thin plywood, some spray paint and a few screws.

 

1. simply cut out a 6" hole centered in the cover.

2. cut a 12" dia. disc out of the 1/8" plywood with a matching 6" hole

3. paint the disc flat black, then  attach the filter medium to the disc with double face tape

4. attach the disc to the cover with 4 short screws.

 

The cover locks onto the scope so no tape or Velcro is needed and it will not fall off, endangering your eyes. Safe to use and inexpensive compared to commercially made units.

Attached Thumbnails

  • filter 1.jpg
  • filter 2.jpg
  • SOL 10-2013.JPG

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#2 steveward53

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Posted 29 April 2014 - 08:57 PM

Nice job ...  :)

 

I would have to recommend however that you swap the filter medium for a sheet of Baader ND5.0 Solar film , it is a far superior product giving greatly improved detailed views over the Seymour or Thousand Oaks film.

 

If you wish to retain the orange colour just use an orange or deep yellow filter in the eyepiece. 


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Steve.

Mak180Pro , 200PDS , ED80 Pro , ST120 , ETX105.

HEQ5ProSynscan , EQ3-2.

Canon EOS1000D(unmodded) , SPC900NC.Std , SPC900NC Mono-chipped.

SW Synguider thru Mercury 705 , "Scopium" Herschel Wedge.

13'-6" pier for Solar..... 


#3 Moonstruck

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Posted 30 April 2014 - 12:13 AM

Thanks for the advice on film choice. I'll certainly give it a try. BTW - is it acceptable for photographic use and visual ?


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#4 steveward53

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Posted 30 April 2014 - 02:40 AM

Will be fine for imaging at full aperture , I use the ND3.8 myself but this is with an 80 or 100mm frac so it helps keep exposures short.

 

You can use the ND3.8 for visual but you MUST put an additional ND1.8 filter on the EP as well , problem with the ND3.8 is that you have to buy a big 500mm x 1000mm roll not an A4 sheet so I would stick with the ND5.0 film.


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Steve.

Mak180Pro , 200PDS , ED80 Pro , ST120 , ETX105.

HEQ5ProSynscan , EQ3-2.

Canon EOS1000D(unmodded) , SPC900NC.Std , SPC900NC Mono-chipped.

SW Synguider thru Mercury 705 , "Scopium" Herschel Wedge.

13'-6" pier for Solar..... 


#5 Moonstruck

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Posted 30 April 2014 - 04:35 PM

Thanks for the good advice; the very reason I joined this forum. I may even try using the 3.8 with my wifes 90mm refractor. A few friends in the local astronomy club may be willing to share the cost of a roll.


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#6 Neil

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Posted 30 April 2014 - 07:18 PM

Steve produces some stunning white light solar images here using very modest equipment.

 

I always look forward to my daily dose of solar images.

 

Clear Skies

 

 

Neil.



#7 woolbrig

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Posted 30 April 2014 - 09:56 PM

I got the filter paper for my home made filters here:

 

3.8 ND Photographic Solar Film

 

5.0 ND Visual Solar Film


Joe

 

Scopes: Celestron C9.25/Hyperstar, SkyWatcher 80ED Pro, WO Star-71 II Mounts: CGEM (Hypertuned), CG5  Guiding: Orion SSAG/ST80/Mini 50, OAG  Cameras: ASI120MC, ASI174MM, ASI224MC, Canon T3i (Baader Mod), QHY10, QHY23