Maximum immersion depth for lenses

Some C-mount lenses reach deep into the camera flange. This may cause the lens to push against the back of the filter glass inside the camera or even make it impossible to screw in the lens.

The table below indicates the maximum possible immersion depth for each uEye model. The actual immersion depth of a lens is given in the relevant data sheet. As lens parts with a small diameter are allowed to reach deeper into the camera flange, the immersion depths are specified based on the diameter.

Beside the immersion depth also the back focal length has to be considered, that means the distance between the last lens and the sensor (named "bfl" in the image below). The back folcal length can be calculated for C-mount wiht the following formular:

x stands for the maximum immersion depth.

Fig. 343: Camera front (sectional view)

Hinweis

Note on the front panel of the USB uEye SE housing

USB uEye SE models introduced before 2008 have a different front panel. On these models, the filter glass is held in the C-mount lens connector by two screws. This applies to the following models:

•CMOS models: UI-122x, UI-146x, UI-154x, UI-155x, UI-164x

•CCD models: UI-221x, UI-222x, UI-223x, UI-224x, UI-225x

This front panel version is indicated by (V2) in the table below.

Camera	Type	Thread depth	for diameter at lens end	resulting max. immersion depth (mm)		min. required back focal length (mm)
			(Ø A,B,C in mm)	CMOS	CCD	CMOS	CCD
USB uEye SE	C-mount	5 mm	24.0	6.9	6.4	6.4	6.9
			20.0	9.4	8.9
			14.1	11.1	10.6
USB uEye SE (V2)	C-mount	5 mm	24.0	9.4	8.4	6.8	7.8
			17.1	10.2	9.2
			14.1	10.7	9.7
USB uEye RE	C-mount	5 mm	24.0	8.9	7.9	6.8	7.8
			19.6	9.4	8.4
			17.1	10.2	9.2
			14.1	10.7	9.7
USB uEye LE	CS-mount	4 mm	24.0	6.1	-	4.9	-
			14.6	7.6	-
	C-mount with extension ring	4 mm*1	22.0*1	11.1	-
			14.6*1	12.6	-
	S-mount M12/M14	8.8 mm	M12/M14	with filter glass: 8.6 mm without filter glass: 12.0 mm	-	with filter glass: 5.1 without filter glass: 1.2	-
USB uEye ME GigE uEye SE GigE uEye RE	C-mount	5 mm	24.0	7.2	6.2	6.8	7.8
			20.4	9.7	8.7
			14.6	10.7	9.7
GigE uEye CP	C-mount	5 mm	24.0	7.2	-	6.8	-
			20.4	9.7	-
			14.6	10.7	-
GigE uEye HE	C-mount	5 mm	24.0	6.9	5.9	7.1	8.1
			20.4	9.4	8.4
			14.6	10.4	9.4
USB 3 uEye CP	C-mount	5 mm	24.0	7.2	-	6.8	-
			20.4	9.7	-
			14.6	10.7	-

*1 May vary depending on the inside diameter of the extension ring used

Hinweis

The data given in the table include the following tolerances as a safety clearance:

•Immersion depth: 0.2 mm/0.5 mm for GigE uEye HE

•Diameter: 0.2 mm

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Maximum immersion depth for lenses