( ( Factors ( affecting ( depth ( of field ) ) ) ) . )
(ROOT (NP (NP (NNS Factors)) (VP (VBG affecting) (NP (NP (NN depth)) (PP (IN of) (NP (NN field))))) (. .)))
Factors affecting depth of field.
(ROOT (S (NP (NNP Depth) (CC and) (NNP density)) (VP (VBP are) (NP (NP (DT the) (CD two) (NNS factors)) (SBAR (WHNP (WDT that)) (S (VP (VBP affect) (NP (NP (DT the) (NN pressure)) (PP (IN of) (NP (NNS fluids))))))))) (. .)))