Thorlabs LA1258 & LA1259 Plano Convex Lens 25.4mm N-BK7 Lot Long FL

Precision Optics – Lab Grade Performance

Up for sale is a matched pair of Thorlabs plano-convex lenses, pulled from a well-maintained optical collection. These are not hobby-grade pieces—these are true lab optics used in photonics, laser systems, and precision alignment setups.

Includes:

• Thorlabs LA1258 – Ø25.4 mm, 2000 mm focal length

• Thorlabs LA1259 – Ø25.4 mm, 2500 mm focal length

Why These Matter

If you know optics, you already know:

• N-BK7 glass = industry standard for high transmission & low distortion

• Long focal lengths (2000–2500 mm) = ultra-gentle beam shaping

• Ideal for:

  • Laser collimation

  • Beam expansion systems

  • Optical bench setups

  • Research / university lab use

These are subtle, precision components—they look simple, but they are highly engineered.

What You Get

• (1) LA1258 lens

• (1) LA1259 lens

• Original Thorlabs cases

Buying these new will cost significantly more—this is a ready-to-go pair for anyone building or upgrading an optical system.