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Peter9
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Reged: 10/30/08
Posts: 3963
Loc: Yorkshire - Born & Bred
Re: Home made Solar Filter new [Re: Arctic_Eddie]
      #5975419 - 07/17/13 02:55 AM

Hi James and Eddie,

The diameter of the filter opening is seven inches. (Larger than at the "half way stage). I figured that it would gather so much light that fiddling about with cutting out for an offset was not necessary. The filter gave excellent results yesterday. It might be fun to make an offset one and comparing the two.
As an aside, the cheapest I could buy a filter to fit the CPC1100, made with the same safety film, here in the U.K was £85 ($128) The one I made cost £20 ($30).

As long as you take care not to compromise your safety, it's worthwhile doing.
And no, I have no thoughts about turning to the Dark side (A.P)

Regards. Peter.


P.S I seem to remember reading that over a certain aperture, (4 to 6 inches I think) you gain little or nothing when observing the Sun. This may or may not be correct as I can not remember the source.

Regards. Peter.

Edited by Peter9 (07/17/13 03:50 AM)


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Arctic_Eddie
Post Laureate


Reged: 12/30/07
Posts: 3194
Loc: St. Petersburg, FL
Re: Home made Solar Filter new [Re: Peter9]
      #5975769 - 07/17/13 11:10 AM

I see your point. If the surface granularity is the finest detail then any aperture with higher resolution is wasted.

--------------------
The shortest distance between one point is an infinitely small circle.

Meade LX200R-8
Nexstar 6SE
AT80EDTA on Minitower
Lots of glass, aluminum, and plastic

Arctic origin - http://www.youtube.com/watch?v=wAx58lIynfY&feature=player_embedded#!

Weather station - http://classic.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KFLKENNE3&wuSelect=PWS

73's de KF4JU


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Peter9
Post Laureate


Reged: 10/30/08
Posts: 3963
Loc: Yorkshire - Born & Bred
Re: Home made Solar Filter new [Re: Arctic_Eddie]
      #5984593 - 07/22/13 02:54 PM

Hi Eddie,

Here's one of the articles I read re aperture and observing the Sun. Thought it might be of interest to you.

http://www.lcas-astronomy.org/articles/display.php?filename=more_on_solar_obs...

Regards. Peter.

--------------------
Astronomy compels us to look upwards and leads us from this world to another


-------------------------------------------------
Scope :- Nexstar 8se + Ron's Rail.
E.Ps:- 1.25" 6.3mm 25mm & 40mm - 2" GSO 26mm 30mm & 38mm W.A - Zooms:- Hyperion 8 x 24mm & AE 8 x 24mm - Barlow:- GSO 2"x2 - Finders:- 9x50 RACI & GLP:- Bits & Bobs:- Solar, 2" Polarized & UHC Filters, Dew Shield, H.C. Holder, Motofocuser, 0.6 Focal Reducer, 17Ah power pack.
Observatory, SkyShed P.O.D (Dream-Maker)


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Arctic_Eddie
Post Laureate


Reged: 12/30/07
Posts: 3194
Loc: St. Petersburg, FL
Re: Home made Solar Filter new [Re: Peter9]
      #5984692 - 07/22/13 03:54 PM

Very interesting article. Thanks for the link.

I use a T.O. glass filter on my AT80EDTA when doing solar viewing. However, here in Florida, it's just too hot to go out in the middle of the day. If I were to do it this time of year, I would have to run the stepper focuser and camera cables into the house and do it remotely.

The small hole idea is still intriguing. One could use a solid cover plate over the SE then drill one tiny hole off axis, may at half radius, then cover it with a small patch of filter material. If the hole were small enough, a piece of welders glass or several ND filters might be enough. You would of course want to do the testing with a cheap webcam in case something went wrong.

--------------------
The shortest distance between one point is an infinitely small circle.

Meade LX200R-8
Nexstar 6SE
AT80EDTA on Minitower
Lots of glass, aluminum, and plastic

Arctic origin - http://www.youtube.com/watch?v=wAx58lIynfY&feature=player_embedded#!

Weather station - http://classic.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KFLKENNE3&wuSelect=PWS

73's de KF4JU


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Peter9
Post Laureate


Reged: 10/30/08
Posts: 3963
Loc: Yorkshire - Born & Bred
Re: Home made Solar Filter new [Re: Arctic_Eddie]
      #5984763 - 07/22/13 04:47 PM

Eddie,

I have a small strip of safety filter left over. I'll let you know the measurements (tomorrow, 22.00hrs here) and if it's any good for giving your small holes idea a try, I'll pop it in the post for you.

Regards. Peter.

--------------------
Astronomy compels us to look upwards and leads us from this world to another


-------------------------------------------------
Scope :- Nexstar 8se + Ron's Rail.
E.Ps:- 1.25" 6.3mm 25mm & 40mm - 2" GSO 26mm 30mm & 38mm W.A - Zooms:- Hyperion 8 x 24mm & AE 8 x 24mm - Barlow:- GSO 2"x2 - Finders:- 9x50 RACI & GLP:- Bits & Bobs:- Solar, 2" Polarized & UHC Filters, Dew Shield, H.C. Holder, Motofocuser, 0.6 Focal Reducer, 17Ah power pack.
Observatory, SkyShed P.O.D (Dream-Maker)


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Arctic_Eddie
Post Laureate


Reged: 12/30/07
Posts: 3194
Loc: St. Petersburg, FL
Re: Home made Solar Filter [Re: Peter9]
      #5985022 - 07/22/13 07:49 PM

That will be greatly appreciated.

--------------------
The shortest distance between one point is an infinitely small circle.

Meade LX200R-8
Nexstar 6SE
AT80EDTA on Minitower
Lots of glass, aluminum, and plastic

Arctic origin - http://www.youtube.com/watch?v=wAx58lIynfY&feature=player_embedded#!

Weather station - http://classic.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KFLKENNE3&wuSelect=PWS

73's de KF4JU


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