Up for sale is ONE brand-new collimating lens that fits Ocean Optics products and many other brand products as well.  It comes with both lens caps and an allen wrench adjustment tool. This lens is optimized for the UV/VIS/NIR range of 160nm to 2500nm.

Besides being excellent in the VIS/NIR range, they are exceptional in the UV range because the lenses are made of fused silica. This is a great lens--I know you will be very happy with it. 

The lenses fit all of the spectrometer accessories pictured in photos 2, 4 & 5 (and many more accessories as well). You are purchasing ONE collimating lens--those are the items circled in blue on photos 2 & 4.

These lenses were manufactured by Spectraconn for a particular client.  Unfortunately, the deal fell through so they were forced to liquidate them at a fraction of the cost.  There is a limited quantity so once they are gone, they are gone.  Spectraconn manufactures fiber optics products and the owner was one the early scientists for Ocean Optics. 

If you have any questions please scroll up and click "contact seller".  Thank you!

More details/specs:

UV grade Fused Silica (JGS1) is synthetic amorphous silicon dioxide of extremely high purity. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in the ultraviolet. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and temperature instability inherent in the crystalline form. Fused silica is used for both transmissive and reflective optics, especially where high laser damage threshold is required. JGS1 is transparent in the ultraviolet and visible regions, and has no absorption bands in the 170-250 nm wavelength intervals. It has an intensive OH absorption band in the interval of wavelength 2600-2800 nm. JGS1 is used for optics operating in the deep UV and the visible wavelength range (Laser Lenses, Windows, Prisms, Mirrors, etc.). It is practically free of bubbles and inclusions.

For even more specifications, please view all 11 pictures.