Plano-Concave Lenses, φ30 mm, Focal Distance: -60 mm, Back Focus : -61.33 mm

[Features]
- This optical lens having negative focal length is mainly used for minification of image and light diverging.
- This is also used for extending focal length in optimal system.
- This also reduces aberration generated by another lens.
- This product is usually used with curved surface of lens facing to object.
[Specifications]
- Outer diameter (φmm): 30
- Focus distance (mm): -60
- Bag focus (mm): -61.33
- Medium thickness (mm): 2
- Material: BK-7
- Design wavelength: 587.6nm
- Refractive index: 1.51680/nd
- Chamfer (45°): 0.2 - 0.5mm
- Tolerance range Outer diameter: φ+0/-0.1mm
- Tolerance range Center thickness: ±0.2mm
- Tolerance range Focal length: ±2％
- Tolerance range Surface quality: MIL60-40
- Tolerance range Eccentricity: within 3 minutes (3')