Datenblatt Stilar 2.8 8 - Docter® Optics

High-Resolution C-mount Lens
• Super-wide-angle lens with high, regular resolution and
excellent color correction over the entire visual spectrum
• Especially designed for 1.2" sensor C-mount cameras
• Manually adjustable aperture
• High relative illumination
• Deviation from telecentricity approx. 5 °
• Focusing range adjustable from 0.10 m to ∞
STILAR 2.8/8 Lens
Focal length (at 546 nm) 8.5 mm
Back focal length (S‘m) 11.3 mm
Relative aperture F/2.8
Image circle diameter 21.43 mm
Object angle (2sigma) 116 °
Total thickness of lens 112.3 mm
Front edge to first vertex 4.0 mm
Back edge to k vertex 0.2 mm
Lens length 117 mm
Lens diameter 75 mm
Adapter rings C-mount, various adapter
rings available
Flange focal length for ∞ 17.53 mm
Insertion depth 6.4 mm
Focusing control manual, lockable
Focusing range 0.10 m to ∞
Focusing angle of rotation 45 °
Aperture manual, lockable
Aperture range 2.8 to 11
Aperture angle of rotation 36.5 °
Mass 752 g
Stilar ® 2.8/8
• Versatility, suitable for machine vision applications, photos in
measurement rooms and surveillance cameras

1,0
0,8
0,6
0,4
0,2
Performance Data for Stilar ® 2.8/8 Lens
Modulation
F/4.0 F/2.8
0,0
0 1 2 3 4 5 6 7 8 9 10
Image height [mm]
0
-05
-10
-15
-20
For 1.2” Sensor Cameras
Spatial frequency 25 and 50 lp/mm ; s = ; radial: tangential:
Distortion / % Rel. illuminance
-25
0 1 2 3 4 5 6 7 8 9 10
Image height [mm]
1,0
0,8
0,6
0,4
0,2
0,0
0 1 2 3 4 5 6 7 8 9 10
Image height [mm]
1,0
0,8
0,6
0,4
0,2
(at 400-750 nm)
1 /3 ” 1/2 ” 2/3 ” 1” 1.2 ” 1/3 ” 1/2 ” 2 /3 ” 1” 1.2 ”
1/3 ” 1/2 ” 2/3 ” 1” 1.2 ”
∞
F/ 2.8 F/ 4.0 F/5.6
1/3 ” 1/2 ” 2 /3 ” 1” 1.2”
0,0
0 1 2 3 4 5 6 7 8 9 10
Image height [mm]
C799 6/2008