This is what I do, and definitely got inuf reach for me to use small aperture of up to F11 :thumbsup: (depending on distance)
Achiever flash with slave attachement(cost about 50 to 60 at Cathay). Get a full-size umbrella and stick 3 sheets of A3 size paper on the underside (white paper very, very efficient in reflecting light, much, much better than translucent cloth):thumbsup: . Attach umbrella on your tripod and use tape to attach flash on to stem of umbrella. Voila, you get a DIY diffused flash, that can be triggered by your cam's flash.
You can set up 2 umbrellas if you wish or attach 2 Achievers in one umbrella if you wish.:think: