[stoppingdown]

I've bought my first camera with IBIS (a6600) a year ago, but until now I didn't pay attention to the new stability tool (IBIS) since I've used the camera only with OSS lenses (the only exception being the Tamron 20mm f/2.8, but the focal is so short that motion blur is easily avoided by shutter times).

Looking at the first few shoots with the Sigma 100mm f/2.8 macro it seems that IBIS is not working: blurred shots around critical shutter times. All of a sudden I'm worried about IBIS not working in my copy (and unfortunately it would be too late for the warranty...). I need to test it in a reliable way. My idea is to take a batch of landscape shots at various shutter speeds and create a statistics out of results - it's the standard way of doing that, if I'm not wrong. How many samples do you think I need? Is it appropriate to use continuous shooting mode or is it better to take single shots? Other suggestions?

Thanks.