I dont own a flash meter or digital camera.
Do you think SB-28(GN max 110 feet at 85mm(max)) with a convertible umbrella has enough flash power to shoot at F8 to F16 if i place the flash 1 metre away from the subject ? Accordingly to kenrockwell website, with that GN, it is able to shoot at F11 for 10 feet away. But no mention about using it with umbrella. maybe someone with experience with umbrella can help me. How much light is lost (1) shooting thru umbrella or (2) bouncing off the umbrella (with black cover)? The distance between flash and umbrella is 0.7m.
Do i need to make any flash compensation if i shoot outdoor or indoor?