On Sharpness, ISO and Shutter Speed

Started Nov 29, 2013 | Discussions thread
tko Forum Pro • Posts: 12,328
Re: isn't it just the IBIS?

In addition, consider the results for the A7R and the D610 in the OP.

The A7R goes from about 2200 to 2500, a 13% change in sharpness. Nothing like the IBIS 50% change over the same shutter speed range.

If you widen your horizons beyond the particular sample images discussed in this thread, you will find that it is already well established that cameras without a stabilization system suffer from shutter shock problems too.

I can only consider what's been analyzed, and there were a lot of cameras analyzed in this thread. The links you posted lead to opinion and guesswork, not graphs, so I would discount them. Anyone can have an opinion, only in this thread did we have analysis.

BTW: Only some OIS systems mechanically lock the IS lens group when the system is turned off. Others keep the IS lens group floating even when off. It's just that the input from its sensing devices is no longer considered.

No. How on can you have a lens element "float" with no power? And if the lens floats, it must be stabilized, or else the images will have blur. Please document this claim.

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