Tuesday 16th March 2010 - Kabin, 7.45pm
Planning your observing with Stellarium.
Tuesday 20th April 2010 - Kabin, 7.45pm
Details to follow.
Tuesday 18th May 2010 - Kabin, 7.45pm
Details to follow.
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Posted: 2009 Aug 22 11:41 Post subject: Idea for an occulting disc?
Was trying to think of a way to reduce the brightness of the solar disc in my PST to make prominences etc at the limb stand out more and came up with this:
Take one of these filters (nearest I could find to plain glass):
Then attach to it centrally a small circle of black card / paper / insulating tape that's approximately or slightly less than the diameter of the sun's image in the eyepiece (probably some trial and error would be needed here).
Then viola! An occulting disc filter that screws into the eyepiece you are using with your PST; most of the sun is obscured except for the limb so perhaps prominences would be more visible?
Just wondered if anyone had any thoughts on whether this might work?
Thanks
Pete
Hi,
As far as I'm aware using colour filters with your pst makes no difference. There for i would just buy something like the meade moon filter. _________________ Celestron C100ED-R, Meade LX200 10" & Series 5000 80mm Apo, Coronado PST
EQ6 Pro with GPS
Meade Series 4000 Eyepieces & 2x Apo Barlow
Tele Vue 4x & 5x Power Mate
Meade DSI Colour & DSI II Pro, Image Source DBK 21, Canon Eos 400D
Pete
All i know about black spots is what I read in Treasure Island
however seems like a goer so why not try it and report back to us.
Bests of luck
Cosmic _________________ Meade LX200 Classic 10" SCT (Observatory)
Bausch and Laumb 6" SCT (Mobile)
Mintron MTV-12V6HC-EX ccd video cam
Canon Digital Rebel XTi 300D modded
15x70 Astro Binoculars
10x50 Zeiss Binoculars
You should be able to De-tune the Etalon away from surface
detail and towards Limb,i have used variable Pol filters
in the past with PSTs which do improve contrast a bit on
the surface,for ulitimate PST views a Double stack filter
is required,this is great for surface and limb,proms can take
on more of a 3D affect.
Brian
_________________ " Gentlemen only ever use Refractors "
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