The SB-400 is compatable with the D50.
Initially it might be handy to compare it with the D50 pop-up unit. D50 pop-up at base ISO of 200 has a guide number of 15. The SB-400 at ISO200 has a guide number of 30 and has a tilting flash head that can be set for horizontal, 60, 75 deg and vertical. On the D50 it can only be used in i-TTL mode, so there is no manual option. Overall a step up from the pop-up flash but lacking the versatility of other Nikon system flash units.
It all depends what you want from a separate flashgun in terms of power and versatility as to whether the SB-400 is a worthwhile purchase for you or not.
If you require swivel/bounce head, ability to take stofen type diffusers, a range of manual power settings, or more power, then you will have to look at other units. SB-600, SB-800 (discontinued now but may be available used) SB-900, or model from someone like Metz. I mention Metz specifically as it is a company that has many years experience making professional flash units, so they are a company who's products can be relied upon.
Don
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