Been looking for a flashgun for my sony alpha. Came across the 'Sigma EF 500 DG ST'. I noticed it doesnt have HSS but has ADI. What exactly is HSS, and is it a 'must have' feature for a novice photographer?
Just really need to know what HSS is and if i could get away with using the: 'Sigma EF 500 DG ST' or if i'd need the: 'Sigma EF 500 DG Super' that has HSS??
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