Originally posted by mawz Remember that Oly needs those f2 lenses to be in shouting distance for high ISO performance and DoF considerations due to the small 4/3rds sensor's poor high ISO performance and larger DoF
While the negatives of the 4/3 sensor are why many here don't own Oly digitals (I don't either, though I love my OM-4T), my point was that the wider apertures are extremely useful for the option of faster shutter speeds and hand held shots in low light in conjunction with SR.
Originally posted by mawz And they're bloody expensive (Around twice the cost of a DA*).
The Oly 12-60 f2.8-4 is equivalent to an APS-C 16-80mm! Better on both ends than the 17-70. It is extremely expensive at $800, but it incorporates a fast ring motor (instead of Pentax low-torque, not faster, micro motors - And this Pentax will not have a motor). The 17-70 is only f/4, and will only be gear driven, but it would be great if they saw the need for that extra range.
Since the Sigma does the 17-70 range already, but gives you f2.8-3.5 through most of the range at $350, I assume the dimmer Pentax 17-70 can't be
more than $350.
Originally posted by mawz A 17-70 f2.8 would be bloody massive, even as a DA lens
The 17-70 f4 SDM would be a good replacement for the 16-45 in most cases (I'd miss the mm at the wide end though).
At least compromise and make it a continuous f3.5 which won't be as huge. That way it would be a great value "wow" lens, rather than one people are already explaining away, though "missing the mm at the wide end", etc. Pentax should stop aiming for "sorta OK" range zooms, and aim for "WOW" zooms at greater value while taking advantage of being owned by glass blank maker Hoya.