glue-lens-dat
A. Optical-grade Epoxy (Best + Most Common)
Examples:
- EPO-TEK 301
- EPO-TEK OG142 / OG159-2
- Loctite 3771
Pros
- High transparency (>95%)
- No fogging
- Waterproof + pressure-resistant
- Safe with plastic lenses
- Ideal for bonding a flat protective window
Cons
- Long curing time
- Must be applied carefully
B. Optical UV Adhesives
Examples:
- Norland NOA61 / NOA63 / NOA65 / NOA81
- Dymax 6-621
Pros
- Very clear
- Fast UV cure
- Safe for plastic and glass
- Precise control
Cons
- UV light must reach the adhesive
- Not ideal for thick layers (>1 mm)