Top positive review
10 people found this helpful
Excellent Filter Film for a Telescope
on 8 May 2012
Having some experience in Solar observing following several Eclipses I did not get this product from this buyer but my local photographic shop, who sold me the Telescope, this is just a confidence thing on my part, having seen this go wrong in the past. However, the original reviewer has confirmed this is the ND 5 film suited for use with telescopes, so I will be happy to come back here should I need to protect another instrument.
At A4 it is just about wide enough to fully cover a 5" Telescope and long enough to also also cover the finder scope (because you don't want to peek directly at the sun at any magnification). You could probably go to 6" or larger but be absolutely sure you have no chinks or gaps to allow unfiltered light into your scope. Baader offer some good advice on building a filter cell which I have adapted. I followed their instructions for the scope collar but extended the frame for the film to cover the star finder. It worked well over the weekend photographing Sun spots. I am now looking forward the transit of Venus in June, and possibly the next Eclipse expedition.