#2. "RE: D5000 and SB-24 internal flash still tries to open" In response to In response to 0
Welcome to Nikonians! The SB-24 was designed to be used with Nikon film bodies in TTL mode. Nikon DSLR's require a Speedlight that is i-TTL compatible. Film TTL and Digital TTL (i-TTL actually) are two completely different systems that are not compatible with each other. The SB-24 can be used with your D5000 with the Speedlight set in A (non TTL Auto Flash) mode the (A) left most position on the switch at the upper right corner on the back of the SB-24. It can also be used in Manual Flash mode (M) one click to the right of (A). The D5000 must be set in Manual (M) exposure mode and the Aperture set to corrispond to the f/stop indicated on the SB-24's LCD display based on the flash to subject distance and the ISO. If you use Auto exposure mode or any exposure mode other than Manual (M) on the D5000 with the SB-24 you will have exposure problems. To take advantage of TTL (i-TTL) flash control with the camera in any exposure mode you will have to use the built in Speedlight or an SB-400, SB-600, SB-800, or SB-900 in the camera's hotshoe. I would recommend getting an SB-600 or higher as the SB-400 is only slightly more powerful than the built in Speedlight and can not be used as a remote. Good Luck and Enjoy your Nikons!