PATIKIL Convex Lens 150mm Focal Length 50mm (1.97 Inch) Diameter Round Glass Magnifying Telescope Lens Trial Set Ground Edge for Lab Physics Class Optics 4pcs

Material: Glass; Focal Length: 150 mm; Size: 50x7mm/1.97x0.28inch; Package Includes: Convex Lens x 4

Advantage: Made of quality glass, a simple but good optical resistance and durability material that ensures the longevity of the lenses.

Professional equipment production and polishing, to avoid hurting during use, but also to achieve a clear lens, to improve the quality of the light effect.

Instruction: When installing the lenses, you should pay attention to the cleanliness of the lenses to avoid fingerprints, dust and other factors affecting the optical performance.

NOTE: Choose the appropriate focal length and size to purchase according to your need; In the process of use, avoid strong impacts and scratches on the lenses, so as not to affect their performance and life.