You can buy solar film (thin plastic sheets) at a very reasonable prices online. However, the sheet format isn't great for photography, telescopes or binoculars. You can by them as screw-on filters, but the cost gets a bit ridiculous and the size selection is limited.
This instructable is trivial, but that's where the beauty lies. Using cheap and readily available filter step-up adaptors and UV filters you can fit solar filters to your equipment.
- Protects film from accidental scratches.
- Wind protection to stop creases.
- Holds filter flat and close to lens to stop internal light reflections that can create image artifacts.
- Looks clean and professional.
- Made using cheap and readily available parts.
- Securely holds filters to reduce risk of them slipping and exposing your eyes to magnified UV.
Important safety feature when using with telescopes or binoculars!
It is important to never scratch or crease the solar film since it might allow dangerous UV light to reach your eyes. If you mistakenly do so while following this instructable, don't try to salvage that section of film, just use a different piece.
This technique can also be used for colored gels!