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 LD1357-ML is a package-weighted 0.04 lbs, SM05-mounted bi-concave lens featuring a 1/2-inch diameter, an N-BK7 substrate, and a focal length of -50 mm in an uncoated configuration, following its release date of November 23, 2015. Lifecycle status for this component can be verified through current manufacturer documentation. Please submit the exact part number, quantity, and application requirements to receive a formal quotation.
Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Thorlabs references — within one business day.
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 LD1357-ML. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.