Back Focal Length Adjustment - Barco DP2K-36BLP User And Installation Manual

7. Lenses & lens holder
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P DMD.
F Field of view.
How to shift the lens of the DPxK BLP series projector?
1. Use the up and down arrow keys on the local keypad to shift the lens vertically and use the left and right arrow keys on the
local keypad to shift the lens horizontally.
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How to zoom in or out?
1. Is the zoom lens equipped with a motorized zoom?
If yes, use the "+" and "-" zoom keys on the local keypad to zoom in or out.
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If no, use the zoom barrel on the lens to zoom in or out.
How to focus?
1. Use the "+" and "-" focus keys on the local keypad to focus the image on the screen.
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Take into account that the lens focus may slightly drift while the lens is warming up from cold to operation
temperature. This is a typical phenomenon for projection lenses used with high brightness projectors. The
operation temperature of the lens is reached after approximately 30 minutes projection of average video.
7.6

Back Focal Length adjustment

When to adjust the Back Focal Length?
If a lens is used with a throw ratio suited for the application, (lens selection depends on projection distance and screen size) typically
one would NEVER need to adjust the Back Focal Length of the projector.
A Back Focal Length adjustment is only required in case the Focus range of the installed lens does not capture the projection
screen either for FLAT and/or for SCOPE. In other words, when it is impossible to focus the image on the screen for FLAT and/or
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R5906753 DPXK BLP SERIES 20/11/2017
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