Thanks for all the inputs.
In my context of Av mode, i refer to the feature of minimum shutter speed, and being able to use iso range automatically.
if i have 85mm lens, there's no way i can limit my shutter speed to faster than 1/90. Also iso is fixed, i dont have the luxury to preserve my iso settings. Thus i said Av is not advisable.
On sunny location, maybe i can make work around such that when it get dark, shutter speed will be above 1/90.
if this dont work,
I guess i will use manual.
I want the book. but i want it in PDF. If not, later on, i will surely buy this book.
in the mean time, i will play with my settings.
And yes, upon using manual using flash, i tend to use manual unconciously all the time.
Which is goid, because, u learn to tell the settings, just by being in the location.