Day/night cameras are colour cameras that, below a preset value of light, show black/white pictures only. Some cameras can also "view" in full nightime darkness using an infrared illumination. However standard lenses cannot focus properly in the infrared area. These lenses which are especially designed for these camera types, eliminates the need to re-adjust the focus when shifting from colour to black/white.
Standard lenses are designed for the visible spectrum. When used in the (near) infrared they produce an out of focus and blurry image even after re-adjusting the lens. The infrared corrected lenses have a fine resolution in near infrared area.
Brightness in a lens is indicated by the F-number. However the transmission factor is also important because of the large number of separate lens elements put together to create a lens. A special coating technology is necessary for increasing the transmission factor in the broad light band from visible to near infrared.

 

DV5x3.6R4B-2			DV5x3.6R4B-SA2

			DV5x3.6R4B-2	DV5x3.6R4B-SA2
Image format			1/2" - 1/3" - 1/4"
Focal lenght		mm	1.8~360
Max aperture ratio		f	1.4
Zoom operation			manual
Focus operation			manual
Iris operation			manuale	auto DC)
Angle of view (H x V)	1/2"	Wide	95°54' x 72°24'
		Tele	19°57' x 15°09'
	1/3"	Wide	72°24' x 54°25'
		Tele	15°09' x 11°26'
	1/4"	Wide	54°25' x 40°50'
		Tele	11°26' x 8°37'
Min.focusing distance		m	0.3
Object dimensions at min. focusing distance	1/2"	Wide	694 x 457
		Tele	110 x 83
	1/3"	Wide	457 x 321
		Tele	83 x 62
	1/4"	Wide	321 x 232
		Tele	62 x 47
Back focal distance		mm	7.87
Exit pupil position		mm	-81
Filter thread			-
Mount			CS
Weight		g	65	75
Coil resistance			-	drive coil: 190Ω damping coil: 500Ω
Current consumption			-	23mA (max) at 4Vdc
Notes			metal mount  aspherical lens
				when power is turned off, iris will be automatically closed DV5x3.6R4B-SA2L:  long cable type (230mm)

 

Reference technical notes
Introduction to CCTV lenses Auto iris lenses Optical calculator

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