FLIR B series User Manual page 70

15 – Handling the camera
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4 Correctly position the lens cap in front of the bayonet ring.
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5 Carefully push the lens cap into position.
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6 Rotate the lens cap 30° clockwise (looking at the front of the lens).
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Publ. No. 1558792 Rev. a460 – ENGLISH (EN) – July 1, 2010