The U-13X UV 13x Objective Lens has a rear conjugate corrected for infinity, making it ideal for UV laser applications. Computer-optimized optical designs yield wavefront quality better than 1λ for 300 nm. Damage threshold exceeds 8 J/cm2 with 12 nsec pulses at 1064 nm. Our standard AR.10 antireflection coating is optimized for 245–440 nm. The housing has a standard microscope objective thread for easy mounting.