70mm asymmetric biconvex condenser lens

Product Description

Premium 70mm Asymmetric Biconvex Condenser Lens with Aspheric Surface

This high-quality surplus condenser lens is designed for professional illumination systems, featuring an aspheric surface on the highly curved side for superior light collection and reduced spherical aberration. Ideal for restoring vintage equipment or enhancing optical projects.

Key Specifications:

• Diameter: 70 mm

• Design: Asymmetric Biconvex (one highly curved aspheric surface)

• Material: BK7 Optical Crown Glass

• Effective Focal Length (EFL): ~50–60 mm (approximately 55 mm)

• Center Thickness: ~27 mm

• Coating: Uncoated

• Condition: Excellent – No scratches, haze, chips, or coating defects

Optical Performance:

• Aspheric Advantage: Reduces spherical aberration for sharper, more uniform illumination compared to standard spherical lenses

• High Light-Gathering: Short EFL and large aperture maximize brightness

• Thermal Durability: Thick BK7 glass withstands heat from projection lamps

Applications:

• Restoration: Direct replacement for Kodak Carousel, Beseler, Omega, Durst, or similar slide projectors/enlargers

• Optics Experiments: Ideal for focal length demonstrations, aberration studies, or custom beam-shaping setups

• DIY Projects: Solar concentrators, custom projectors, LED collimation, or simple microscope/telescope condensers

• Education: Perfect for optics benches in classrooms or hobbyist workshops