Sigma 50-500mm lens Filter Holder

thingiverse

I'm capturing images of a solar eclipse with this filter holder, opting for a Baader AstroSolar Visual Solar Filter Film instead of an expensive threaded filter. This film is usually used in telescopes but works with my DSLR camera thanks to a special lens adapter - it's safe for both eyes and electronic pickups. This attachment can also hold Rosco lighting filters. The necessary hardware includes: 2 M3X20 bolts 4 M3X12 bolts 6 M3 nuts In my photo, I used two plain M3 nuts and four 3mm Wing nuts. I recommend buying bolts with hex external heads and using M3 x 5mm x 5.3mm Brass Cylindrical Knurled Threaded Insert Embedded Nuts for easier installation and removal.