Originally posted by reh321 Why are people at this Forum so acquisition oriented? What needs are here that could be satisfied if only Sigma would release 1 of the 28 lenses that the haven't released in K-mount yet, or haven't released in any mount? ....
I think perhaps you're over-stating it just a little. It isn't so much being acquisition oriented, although I have no doubt that there are those here (as there are on any internet forum about anything) who simply have to be the first on their block to have the new, shiny widget, I think that for most of us it's about options. For the brand, of course, it's about having enough support in the ever-growing third-party market to guarantee survive-ability. In my case, and for all those of us who shoot wildlife, and birds in particular, the lack of 150-600mm and 60-600mm Sports and Contemporary series lenses from Sigma for K-mount is disappointing and has an actual impact on how far we can advance the level of our photography.
I shoot very regularly with two guys, one who uses a D500 (he's actually a Sigma ambassador) and the other shoots a 7D Mark Whatever-it-is, and they both have/have had
both of those lenses. While I get excellent results with my Sigma 150-500, and I love it, those lenses are
noticeably superior in low light, in terms of acquisition speed, sharpness, bokeh... go down the list. For me, at least, it's just a matter of wanting to be able to exercise the very good/quite excellent available options in third-party lenses (which have come a
long way) to up my game. Plus, God forbid I have a mishap... there's only used stuff around to replace it, and those lenses are getting older and more worn out everyday; I can't believe the miles I've put on my 150-500 since I got it in April. Similarly, there are any number of times that I use my Sigma EX 70-200mm. Again, it's a very good lens, fast, sharp, capable, but it doesn't hold a candle to the Sports model they recently released. That lens is amazing in every way. The Sigmas also feature really excellent Optical Stabilization; while with Pentax IBIS, this isn't critical for the 70-200, when you've got your big lens out past 350mm, that matters a lot, and the Pentax 150-450mm doesn't offer that system. And for those who may be wondering, yes, I have actually tried the Pentax 150-450 several times, and the Pentax 70-200mm, for quite bit of rental money... They were both virtually mint; I didn't like either one.