I am planning on buying a more powerful dediated flash for my A2. I currently use a 300EZ with my shorter lenses and a vivitar 285hv when I need a powerful flash. I am considering a new 540ez or the sigma ef500 super, can anyone who has used the sigma for at least a year comment on the durability of this flash. is there anything that I will gain with the sigma as it is based on newer technology?
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