Confirm the exact configuration
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

Thorlabs
The Thorlabs 355440-B is an unmounted aspheric lens featuring a focal length of 2.8 mm and dual numerical aperture ratings of 0.26 and 0.52. This optic provides working distances of 2.0 mm and 7.1 mm, and incorporates an anti-reflective coating optimized for the 600 to 1050 nm wavelength range. Each unit has a package weight of 0.04 lbs and was released on August 19, 2014. Please submit the exact part number, quantity, and application requirements to request a quote.
For a faster response, include quantity, condition, and delivery destination.
Verified configuration
Engineering context
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.
Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.
Our sourcing response is prepared against Thorlabs 355440-B. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.