DIY Solar filter advice sought

Trying to build a solar filter for my ETX-70. Anybody got any bright ideas?(sorry!)
Found a few on the web, but they dont seem to keep the film taught- surely this leads to a distorted image??
Like this one...
wkaa.net/gallery/SolarFilter?page=1

Cheers,

Dave Power

Where do you buy solar film like he has in the slide show build?

Deirdre Kelleghan
IAS
www.irishastrosoc.org

John O'Neil bought the Baader solar film from north Down telescopes, about 15-20 euro.
www.mccreaa.freeserve.co.uk/

I use the Baader astrosolar, havent had any problems with it.

I bought a filter from Thousand Oaks filters. I actually bought it for the Lidl scope but it fits the ETX70 perfectly. I'm sure they have a set one for that particular scope if you ask them.

Alternatively see here www.scopetronix.com/etx60acc.htm

If you want to actually make it yourself, Baader Astro-filter, as mentioned, is perfect.

Good luck,

Daniel

Any tips for manufacturing one???