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PostPosted: Wed Mar 25, 2015 10:29 am 
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Joined: Wed Mar 25, 2015 9:49 am
Posts: 2
Hi all,
My first post here so please let me know if it should be somewhere else!
Following the excitement of the eclipse last week, I resurrected my 10" and purchased a Baader Solar Film for future events (I was left to only camera -photo attached- and pinhole (and welding glass :shock: ) to view with).
My plan was to make a front for the scope as one finds online and included in the filter pack.
I have a 10" f/4.8 reflector and looking to use a cardboard 14" diameter for the full size of cover for the front of the scope, with a smaller 6" aperture which will be contain the film. Procedure of this is seen on
http://www.astro-physics.com/products/accessories/solar_acc/make_sol.pdf

However my concern is using this is that the filter film will not be able to cover the complete telescope aperture (200mm x 300mm film against a 250mm diam aperture on the scope) - I had the idea of using several sheets of tinfoil/card/thick paper on the large region which are not protected, and an 8"x8" sheet of the Baader film over the 6" hole... BUT would this be safe, or should I accept the possible dent to the bank balance and purchase either the 1m x 0.5m (ND5 not the photo one!) film or a glass filter?

Many thanks all for your help,
Pete.


Attachments:
File comment: Nikon D5100, ISO 100, Zoom 300mm, f/45, 1/4000s using Tamron 70-300
Sun & Aurora 2.png
Sun & Aurora 2.png [ 167.63 KiB | Viewed 1330 times ]

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Orion Optics Europa 250 f/4.8 & GEM Eq tripod mount, telescope adapted to have Skywatcher Dual Speed Crayford Focuser
1.25" lenses:
25mm and 10mm Plossel
x2 Barlow

And for the Astrophotos!
Nikon D5100 & T-mount for scope
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PostPosted: Fri Mar 27, 2015 3:17 pm 
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Joined: Mon Jan 18, 2010 9:25 am
Posts: 5117
. Welcome Pete, the Sun looks happy in your photo.

Regards, David


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PostPosted: Fri Mar 27, 2015 7:48 pm 
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Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3258
Location: Wellingborough
Hi Pete.

Many people do make a "sub-aperture" solar filter for their large reflector telescopes. For instance, make up a full-aperture cardboard cover for your 10inch, and cut an off-centre hole which will fit between your spider vanes and will avoid your secondary holder - probably 4 inches aperture for your 10inch I'm guessing. Fit your solar filter material securely over this 4inch hole , and in use position the filter between your spider vanes. This will give you the equivalent of a long-focus 4inch apo refractor view for your solar imaging.

Regards,

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Brian
52.3N 0.6W
Wellingborough UK.

254mm LX90 on Superwedge, WO ZS66SD, Helios 102mm f5 on EQ1, Hunter 11x80, Pentax 10x50
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