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DMD Chip

Dear sir,
 
If my dmd has a tilted angle of +/-12 degree, which has a f-number of 2.4. What if I put a lens before the dmd which f-number is 2 (smaller) or 3 (bigger) ??? what would happen??? what would happen to the contrast if I used different f-number of lens?
 
and what is the specifications of 0.55 xga dc2 dmd?
 
thanks

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