7.5mm F/1.0 LWIR Manual Focus Lens For 640x480-17um and 384x288-17um

Infrared Lens - Optical Correction:

Except for special circumstances, in general, a single spherical lens cannot correct chromatic aberration, a positive lens produces negative chromatic aberration, and a negative lens produces positive chromatic aberration. In order to reduce the chromatic aberration, the combination of glass with different refractive index and different chromatic aberration can eliminate the chromatic aberration.

A double lens group or a doublet lens group composed of positive and negative lenses of appropriate shape is a simple structure that may achromatize. The method of reducing dispersion of this doublet lens group is a commonly used optical infrared correction method.

After optical correction, the distance between the focal planes is brought closer (but not eliminated) due to reduced dispersion and reduced refraction separation of infrared and visible light. For lenses with a short focal length, after optical correction, the focal plane deviation between infrared and visible light is small, and the impact on image clarity is small. But as the focal length gets longer, the dispersion will be gradually enlarged, and the focal plane deviation between infrared light and visible light will be greater, and optical correction cannot make both images clear at the same time.

Infrared Manual Focus Lens Parameters:

Focal Length	7.5mm
F#	1.0
Detecto	640x480-17um / 384x288-17um
Average Transmission	＞85%
Circular FOV	(H)71.9°x(V)57°x(D)84.4°
Back Focus Distance	16mm
Back Working Distance	11mm
Dimensions	47mm / 41mm
Focus Type	Manual Focus
Focus Range	0.2m to infinity
Mount Type	M34x0.75
Weight	100g
Operating Temperature	-20℃ to +60℃
Storage Temperature	-40℃ to +80℃
External Coating	DLC / AR Coating Available

Infrared Lens Processing Equipment:

1. Inner carving test platform;

2. Microscope;

3. Opto Tech aspheric processing;

4. Polishing machine;

5. Thickness Gauge;

6. Ultrasonic Cleaner;

7. Workshop;

8. Interferometer;

9. High and low tempera ture test chamber;

10. High polishing machine;

11. Optical bench;

12. Raul milling;

13. Atomic force microscope;

14. Centralinstrument;

15. Hand Grinding and Polishing Machine;