Turns out the SB-28 was gone from the photo shop and a SB-24 was now there at $90. I kind of had my mind set on the SB-28 as it can go wider, so I got one off ebay. The SB-28 has a pull-down diffuser that extends the range to 18mm coverage. The SB-28 has an external sensor, so it can be used on all my cameras.