I think they read the market extremely well and don’t see a match btwn their strategy and the needs of action shooters.

300mm F2.8 G Master OSS lens, set for an Sony is developing a 300mm F2.8 G Master OSS lens, set for an

Like the lens, the converters are beautifully finished to match the lens and appear extremely well made. TCs, I'd be remiss to give that up and start over with the much more expensive Pentax "long" TCs to match the FA*. tru this is the case with all primes that are wide apertures regardless of built in t/c ,in fact f2. The other thing I’d say is if you’re regularly shooting shorter than 300mm is there are a number of excellent options at shorter focal lengths including two 70-200/2. Many companies identified strategic risk in China and moved essential production facilities there many years ago.There aren't really any other direct alternatives from competing manufacturers that give you the ƒ/2. Equipped with all of the latest technology to compete with the camera manufacturer’s products and produces tack sharp end result images.

Sigma 300mm F2.8 APO EX DG HSM: Digital Photography Review

DG OS HSM S lens, Sigma employed an iris diaphragm with nine rounded blades, which has resulted in very nice bokeh in our view. In terms of image and construction quality, in my opinion little or nothing at all is sacrificed by going the Sigma 300/2.DG OS HSM S is a fast telelphoto zoom lens for full-frame DSLR cameras, offering a constant aperture of f/2. The new Sigma 120-300mm lens is the first "Sports" model in Sigma's new Global Vision line of lenses.