SB-21 flash users

Hi Guys
Anyone using an Sb-21 closeup flash on a D7000 or the likes? I have a chance to get one in a local pawn shop, cheap, but have no information this oldie.
Any thoughts? I will be using it with a Sigma 105 2.8 macro.
Harle

You should do some research... there are two versions SB-21A and SB-21B... You might need an adaptor to fit the barrel of that Sigma... I believe the SB-21 is a 52mm thread... You'll definitely need an adaptor to convert the plug, because I don't think you have that connector on the D7000

An SB-21B will fit on your F5