Long Lenses, Wide Apertures: A primer on shooting distance and lens focal lengths.
Variable and Fixed Aperture Lenses: Speed is fine...period.
The Hoodman Hoodloupe: Using a loupe in the field before you dismiss your subjects.
I See 'em, I Gotta Buy 'em. Ebay helps find the rare and useful.
Snoots and Grids: PWAG lighting using speedlight grids.