5 of 7 people found the following review helpful
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This review is from: Baader Astro Solar Film A4 Sheet (Electronics)
The product name says that this is a A4 sheet. A4 is a standard that size that is 210x297mm. But the size of this film is 200x290mm.
My telescope mirrors diameter is exactly 200mm so that missing 10 millimeters will not allow full size filter. Smaller diameter means less resolution.
Other properties are very good but I'm really disappointed about the violation of the size of A4 standard.