67-246 30 mm Dia. N-SF5 Precision Aspheric Lens; EFL=17.5mm; NA=0.86 Uncoated

The 67-246 is a high-performance aspheric lens offered by Edmund Optics. This lens, with a catalog number 67-246, is made from N-SF5 Schott, a high-quality optical glass known for its excellent transmittance and low autofluorescence. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties. However, its base material ensures high-quality performance.

The lens has a diameter of 30 mm and a numerical aperture (NA) of 0.86, indicating its ability to collect and focus light efficiently. The effective focal length (EFL) of this lens is 17.5 mm, making it suitable for applications that require a moderate focal length. The lens's shape is aspheric, which means it has a non-spherical surface designed to reduce spherical aberration and improve optical performance.

The geometry of the lens includes an inner radius of 0, an outer radius of 0, a thickness at the edge of 1.78 mm, and a thickness at the center of 13.5 mm. The lens's front surface has a radius of curvature (R1) of 11.772 mm and is essentially flat (R2 = 0). The back focal length (BFL) is 9.43 mm. The lens's front surface has been precisely crafted to minimize optical aberrations, ensuring superior image quality.

This lens is a great choice for applications that require high-quality imaging, such as microscopy, beam shaping, or laser applications. However, due to its uncoated nature, it may not be suitable for environments with high levels of dust or other contaminants, as these could potentially scratch the lens surface.