Great news everyone panasonic did indeed hold the lens up vs canceling it. It was held up due to manufacturing difficulties, it seems they have been surmounted and hopefully it will be released at Photokina in September.
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More then merely interesting, I think. It's significant for a few reasons. 1. it provides a competitor to the Olympus 40-150mm 2.8 and hopefully leads to better pricing for both. 2. It shows Panasonic's commitment to the system. 3. Maybe it is indicative of the success of Panasonic's recent cameras especially the GH4 as it is much more suited to it, then any of their other cameras.
I wish The focal length was a bit longer, seeing I already have The 35-100. Maybe they could finally start selling a teleconverter at least. If Panasonic could make a stabilized 300/4 that would be best.
I'm hoping that Panasonic releases it along with their zoom teleconvertor. They patented a design for one a few years ago and with the release of this lens could you think of a more perfect accessory? A 150mm 2.8 a 210mm 4 and a 300mm 5.6 all in one nice and small package. Not the size of optic but it's motion in the ocean baby!
HOWEVER...I'm very happy to see a continued expansion of our system. Not only does it show Oly/Pan's commitment to the platform, but it should hopefully get more and more people to buy into M4/3...you know, the one's who are saying "I would get M4/3...BUT..." well, more and more of those "but"s are being answered...interested or not, this is a significant and serious piece of gear coming our way. Good to see...good to see.
I am interested in small primes over fast primes so a 150/4 and a 300/5.6 would be more interesting to me. A little extra noise by raising the ISO is a small price to pay when I am backpacking, especially at my age.