28 mm F/3.
5 CERCO®
UV LENSES
• WIDE ANGLE
• COMBUSTION EXPERTISE, GENRAL PHYSICS AND FORENSIC SCIENCES
• C-MOUNT
UV 28 mm
TECHNICAL SPECIFICATIONS
Main features
Focal length 28,3 mm
F stop range F/3.5 to F/16
Focusing distances 25 cm to infinity
Picture size (mm) Ø 18 mm (full performances) usable up to Ø 25 mm
Field of view 35.4° diagonal (image Ø 18 mm)
Usable spectral range 240 nm (MC) or 190 nm (uncoated) to 900 nm
Optical transmission
[240 to 430 nm] T>90% ; [visible to IR] = 35%
Multicoated standard type
60% from UV to IR ; 50% at 190 nm
Uncoated type
40% for 40 llines/mm, F/3.5, image Ø 18 mm (30 cm focusing
MTF, UV range 240-410 nm
distance)
Radial Distorsion <0.4%
Vignetting <20% inside Ø 18 mm ; 50% at Ø 23 mm
6 lenses, made f synthetic fused silica and UV grade mono-crystal
Optical design
calcium fluoride
Mechanical Characteristics
Overall lengh (mm) 36 (infinity) / 39.5 (close focus)
Overall Diameter (mm) Ø 37.5
Camera mount C mount (Ø 1’’, 32 tpi 52)
Front filter mount M 34 x 0.5
The 28 F/3.5 UV lens type CERCO® 1990 has been designed for video cameras with image
intensifier working with UV light. This UV lens is usable from ultraviolet to near infrared without
focusing adjustment. Two types are proposed: standard multicoated type, optimised from 240nm to
410 nm wavelength range, and uncoated type, usable from 190 nm to 900 nm.
CONTACT CERCO
CERCO Roucas Trouca Payan RD 5
Email : contact@cercolens.com F-13310 Saint Martin de Crau
Phone : + 33 7 69 89 43 94 www.cercolens.com
