Normal Power
The narrow beam guide numbers are interesting, but they're only relevant at higher focal lengths. This list represents the middle of the zoom range — a field of view which covers the "normal lens" range of 50mm equivalent focal length — that is, about 35mm on a current Pentax dSLR. If a flash only has a zoom setting wider than this field of view, this table shows the power with the most focused beam available.
- Sigma EF-610 DG = 2.4×
- Pentax AF540FGZ = 2.2×
- Tumax DPT5 = 2.1×
- Metz 58 AF-1/AF-2 = 2.0×
- Tumax DPT3 = 1.9×
- Metz 54 MZ-4i = 1.8×
- Sigma EF-530 DG = 1.8×
- Metz 52 AF-1 = 1.6×
- Promaster 5750 = 1.4×
- Metz 50 AF-1 = 1.4×
- Metz 48 AF-1 = 1.4×
- Promaster 7500EDF = 1.3×
- Metz 44 AF-1 = 1.1×
- Pentax AF360FGZ = 1.0× (Of course.)
- Promaster 7400EDF = 1.0×
- Promaster 7200EDF = 1.0×
- Promaster 5550DX = 1.0×
- Promaster 5250DX = 0.64×
- Metz 36 AF-4/AF-5 = 0.64×
- Metz 24 AF-1 = 0.64×
- Tumax DSL28 = 0.54×
- Pentax AF200FG = 0.44×
- K20D/K200D/K-7/K-5 built-in = 0.19×
- K100D/K10D/K2000/K-m/K-x/K-r built-in = 0.13×
