354171-A 4.7 mm Dia. D-ZK3 Molded Glass Aspheric Lenses; EFL=6.2 mm; NA=0.3 AR 350-700nm

The 354171-A is a high-quality aspheric lens from Thorlabs, designed with a 4.7 mm diameter and a molded D-ZK3 glass material. This lens is specifically engineered for use in the 350-700nm wavelength range, making it suitable for a wide range of optical applications.

The lens boasts an effective focal length (EFL) of 6.2 mm, which is a critical parameter in lens selection. The EFL determines the distance between the lens and the image sensor or the object being imaged, influencing the overall system's field of view and magnification.

The lens also features a numerical aperture (NA) of 0.3, which is a measure of the lens' light-gathering capability. A higher NA allows for more light to be collected, which can be beneficial in low-light conditions or when high-resolution imaging is required.

The 354171-A lens is coated with an anti-reflective (AR) coating on both the front and back surfaces. This coating helps to minimize light loss due to reflection, improving the overall efficiency and performance of the lens.

In terms of shape, the lens is aspheric, which means it has a non-spherical surface. This design helps to reduce spherical aberration, a common optical issue that can degrade image quality. The aspheric shape allows for more accurate light focusing, resulting in sharper images with improved contrast and resolution.