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PostPosted: Wed Mar 25, 2015 10:29 am 

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

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,

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 3069 times ]

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 

Joined: Mon Jan 18, 2010 9:25 am
Posts: 5333
. Welcome Pete, the Sun looks happy in your photo.

Regards, David

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PostPosted: Fri Mar 27, 2015 7:48 pm 

Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3628
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.


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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