IC Realtime 3 Megapixel Exmor CMOS 3.3-12mm VF Full HD Network IR-Bullet Camera (ICIPB3000AF) - Manual (Page 22)

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Figure 3-2
3.3 Lens Adjustment
Turn counter clockwise to remove the lens cover, now you can see the iris front and rear control rod.
The front control rod is to focus and the rear control rod is to zoom. See Figure 3-3. Please turn
clockwise to fix the lens cover back firmly.
Important
z
Please remove the sunshield first and remove the lens cover if you can not unfasten the lens
cover.
z The lens cover has the waterproof function. Please make sure it is secure after you complete the
lens adjustment.