I use a Stofen Omni diffuser on my Sigma and paid £14.00 for it. Then discovered that you can make one by cutting the end off a 1 pint milk container and fold in the flaps. It works a treat and is easy to fit and remove.

I still use the Omni, but it can be a tight fit.

I am currently using a Sigma EF 530 DG ST TTL with a guide No. of 53 @ ISO 100 with my KM, K7 and K5.

With no exposure compensation I'm finding the shots tend to be under exposed. This is fine when using RAW, but can be an issue with jpegs.

I read recently that several Pentax users were using the AF 540 FGZ TTL, but claimed it was overpriced, the battery door broke after two years and one person even described it as a piece of c**p.

Does anyone have experience of using this flash and/or can a compatible flash with exposure compensation be recommeded?

Thanks