Lawrence wrote:

Actually, the reverse is true. Image stabilization in the lens require much smaller 
movement as you are rotating the lens. And you have the freedom to choose where to 
place the stabilization element for the optimal position. Whereas in Minolta approach, 
you need a very large movement of the CCD in the focal plane to accomplish the same 
thing (the larger the CCD, the larger the movement)- and it must have been quite a 
technological feat.

Lens image stabilization is tried and true. Minolta approach is innovative, but 
definitely a lot more complex. It remains to be seen if the reliability can match that 
of lens design.


REPLY:

I believe "in lens" IS is far more complex. Typically, an IS lens has twice the number 
of lens elements than comparable lenses without IS. All the glass is needed to 
compensate the various aberations introduced by the moving elements (incidentally the 
Pentax patents on IS lens design, refered to by both Canon and Nikon in their IS 
patents, explains this in detail). Hence an IS lens is optically compromised. Although 
some IS lenses are great the fact is that the same lens would have been even better 
without the IS feature. In addition the complexities means that the lenses are more 
delicate and will also display relatively large sample to sample variation. The later 
aspect is very common for eg. the Canon 100-400 and 400 DO lenses where several byuers 
have returned their lenses or exchanged them with better samples. Some have even given 
up on them completely. 

Pål 







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