Thanks guys. I knew when shooting that they'd be under exposed and thought that when processing with DPP on another PC that I had boosted the exposure up adequately but then when looking again on another PC with another monitor, they looked way under
Not to mention my eyes aren't the best nowadays
Troy, here's a couple of shots of my rough as guts diffuser. It's basically a take away container lined with foil and bubble wrap as the main diffuse.
I'm waiting on a TTL cable to arrive via mail which will allow me to rig up something off camera and have the flash closer to the subject.
It's interesting reading up on the multiple methods people use to take macro shots. I've also heard that using a long rod or stick as a steadying support is handy, that way you can quickly adjust without having to muck around with mono or tripod clamps, especially for constantly moving subjects