Lens Filter for 70MM Binoculars or Camera Aperture

This is an attachment to a 70mm lens that allows one to add a filter in the form of a 90mm x 90mm hexagonal sheet.

✅Fits Snugly
✅Remains in Place
✅No Light Leakage

I used this specific design during the 2024 eclipse in North America with my astronomy binoculars. This print consists of two parts - a base and front cap that snap together to hold the filter sheet securely in place. The snapping mechanism should handle a wide variety of tolerances even if your flow rate isn't finely-tuned. It also includes a fixture used to cut the hexagonal filter sheet. I have only printed this in black and gray PLA, so I cannot say whether lighter colors will allow light to leak through.

If you want to use this for solar photography, ALWAYS USE A PROPERLY-RATED FILTER that meets ISO 12312-2 standards. Looking at the sun through a camera or binoculars can seriously damage your eyes without appropriate protection. Please don't hurt your eyes with my print.

SUGGESTED PRINT SETTINGS

• 3 Wall layers
• 0.2mm layer height
• 0.4mm line width
• Concentric Bottom Surface Pattern

ASSEMBLY INSTRUCTIONS

Step 1: Use the provided fixture on Plate 2 to cut the correct size and shape of the filter you want to install.

Step 2: Place the hexagonal filter sheet on top of the front cap in the inset section

Step 3: Secure the base to the front cap using the pegs and press down to ensure the filter sheet is fully secured

Step 4: Attach it to your camera or binoculars - it should fit snugly, remain in place, and not allow any light to leak in from the sides