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whats the difference between the nikon sb 600 and sb 800 will the sb600 help with shadows or would i need the 800

The smaller SB-600 does absolutely everything that matters for photography. The SB-800 offers a lot of extra fluff, but nothing for which you want to pay. Some difference. SB-600 SB-800 Manual Power Range 1 - 1/64 1 - 1/128 Zoom Range (4) 24 - 85 mm; 14 mm 24 - 105 mm, 14 mm Non-TTL A mode (5) no Yes Commander Mode (6) no Yes Idiotic repeating strobe mode no Yes Colored Filters (7) no Yes Bounce Angle (8) 0 to +90ยบ -7 to + 90ยบ Tupperware Diffuser (9) no yes Modeling light (10) no Yes Remote cord sockets (11) no Yes 1950s Flashmatic mode (12) no Yes Full-power battery life (13) 220 flashes 150 flashes Full-power recycle time (13) 2.5 seconds 4 seconds External battery socket (14) no yes

Here is a good site that compares the two different flashes.But you may want to look at the smaller and lower prices SB400 -- it may be just what you need.

Nothing about these flashes will "help with shadows" unless you bounce them or put modifiers on them.