The SB50 I belive is a DX Flash This will not work properly with the Coolpix 5700. There will be no TTL Flash photography. Go figure.... DX is for Digital, but this camera will not work with it except in manual and auto mode. You will have to get a non DX Flash. I had to turn in the 28DX and get a straight SB28 to work. Now the pictures are perfect. You can also use the SB27, SB26. Go to your manual page 138... half way down in small print it says it wont work in TTL mode with DX Flashes. Sorry to be the bearer of bad new.