Photographic flashes.
I've been offered either of two Nikon flashes. One is the rather old SB28. But not the DX. I've found that the TTL section does not function on my D50. More correctly, the camera just stops when the flash is on that setting.
Price on that is $75.
For $150, I can have the SB 800, which seems to work very well. I'm not that keen on photography, so don't want to buy kit that I don't absolutely need, yet I read that the flash procedures can make or break a picture.
It seems that the 28 is just a smaller, but otherwise old technology device, and that the Through the Lens Technology is vitally important, so shouldn't be missed.
What think you?