to shoot in manual flash mode actually is not that difficult.
to begin you may need a flash meter, but you can get away by doing some tests,
first you need to understand the Inverse square law. - Four Flash Photography Basics we must know
let says you set the flash at half power, aim at a subject at 8ft away, you get f8,
at the same distance you set full power will be f11,
set at 1/4 power will be f5.6
you bring the flash (set 1/2 power) nearer to the subject, at 4ft away will be f16,
further away at 16 ft will be f4.
so now you only need to know if a bare flash at what power at what distance will give you what f-stop, and with a umbrella will give you what f-stop. just need some mental calculation when you change the power setting or the distance of the flash to subject.
after some practice you will know the results will be more consistent than using the TTL set up, cos TTL will is measuring the reflectance of the light from your subjects, it will throw you out of the window if your subject wearing white or black outfit.
as usual very insightful..
tks so much benjamin!
:thumbsup: