Solar Filter Lens Hood (V2) for Canon 100-400mm (77mm diameter)

thingiverse

Updates: * Aug-10 2017: 2.0 update. Uneven clamping had been a major issue, so I increased the number of clamping screws to six and decreased the mounting screws to two. The front cap was also tweaked to hopefully print better in ABS. * Aug-9 2017: To ensure proper alignment, a notch was added to both the outside of the rings and the inside of the hood. Screw holes were made bigger for easier assembly, and a front cover was added (though it remains untested). This is a redesigned version of my initial post from a week or so ago. After being underwhelmed by the low-quality solar filter film I purchased on Amazon, I ordered a sheet of BAADER solar film. When it arrived, I found it to be much thinner than the other film, similar to tissue paper. My previous design would not have been able to hold onto this material securely or keep it taut, so I made some changes. I will look into designing a front cover for this in the coming weeks. Materials needed: 2X M3x12(or 14) screw 6X M3x8(6 might work) flat head screw (flat head not required, just looks better) This design allows you to align your film onto a holding ring and then install that ring inside the lens hood. I highly recommend testing this out on something inexpensive and similar to your solar film before using it for real. If you're using BAADER film, consider using a mylar "emergency blanket" as a test material to get a feel for installing a film. You want the film to be tight but not stretched. Stretching a solar film can cause degradation of its filtering properties, which could lead to blindness and damage your camera! [This is where I ordered my solar filter film](https://astro-physics.com/as50a4) [This was my original design, still useful for thicker solar films](https://www.thingiverse.com/thing:2435107)