Quote:Just as an example:
The Canon 100-400L IS has an image stabilizer providing an equivalent again of 2 f-stops.
During its long lifespan, IBIS started at 2 f-stops and it's now at 4.5 f-stops and it will surely get even more efficient over time - thus you were able to "upgrade" your lens by upgrading your camera. And you simply upgrade your camera more often than your lenses.
The doubt I have ist the following ... in-body stabilization has obvious limitations set by the physical
limits in which the sensor can move (obviously, it can not move indefinately). So, the longer the
focal length gets, the less good IBIS will work ... if shake is too strong, it simply stops working at all.
With ILIS, this is not that much of a problem, since you basically disalign a lens (or a group) ...
this might be done by shifting the lens, or by turning it ... nevertheless, it is much less limited.
For your example you had to take one of the oldest IS lenses, and you had to name about the
most sophisticated IBIS to make your point. (And I still doubt, the point with 4.5 stops is valid for
long focal lengths).
In general, yes IBIS is really nice, and certainly lenses without IS are likely more robust than
those with IS ... still I personnaly found your statement of "ILIS being a desing flaw" unqualified ...
but eventually, this is just me.
Rainer.