SR in Lenses

The new DA645 28-45mm lens is very interesting - the first Pentax lens with SR in the lens. There don't seem to be many fanfares about this, but maybe it's because of the size of the medium format sensor or maybe it's because medium format DSLRs and wide angle lenses need different solutions.

I wonder why?

As the sensor size of the Pentax 645Z is roughly 1.7x larger than 35mm-format, full-frame image sensors, perhaps the movement of SR unit is just to great like you state John.

Perhaps another aspect is that if they are manufacturing new lenses for the 645Z it makes sense to build image stabilisation into the lens? Obviously this will increase the cost of the lens and profits?

I can't afford the 645Z, but it's great to know its available or those that can. I think it will really put Pentax back in the light as a photography brand.

https://www.youtube.com/watch?v=-a_FymAtgqs

It's not the first Pentax lens with optical SR, the Pentax HD D FA 645 Macro 90mm F2.8 ED AW SR dates from September 2012.

Thanks Brian, I'd missed that.