<ul><li>Diameter: 50mm; Pitch: 0.3mm; Thickness: 2mm; Light transmittance: 93%.</li><li>Focal length(Optional) 28mm 30mm 35mm 45mm 55mm 70mm 80mm 100mm 40mm 50mm 60mm.</li><li>Professional and practical design with beautiful appearance, easy to carry and use.</li><li>Usually used in laboratories, schools, teachers, sample observation, eyepiece protection, etc.</li></ul><br><br>

Microscope Accessories Kit 50mm Round Fresnel Lens DIY Projector Plane Magnifier VR Lenses Concentric Focusing Fresnel Thread Lens Microscope Slides(35mm)