sigma 150mm - 500mm DG OS HSM

[billy_bones]

I've been looking at a few options of getting a Sigma 150mm - 500mm lens and have been trying to work out if there are older and newer versions of said lens that all share the same name? i.e. that as they improve the quality of the lens they don't give it any distinguishing reference in the title of the product so it's harder to tell if you are buying an older model or not?
can anyone help me out on this?
I have read some lens reviews that suggest this happens.

I am looking at two options at the moment and the writeup for each is quite different and while all the main points are the same the only difference I can see on the advertisements is that one weighs in at 1,910 g and the other at 1,780g.

so now I'm considering they would try to make it as light as possible so possibly the lighter version would be the better of the two or perhaps the extra weight is due to better newer components that are unavoidably heaver?

does anyone have any knowledge of this at all?

 

[wackii]

I don't have knowledge about this. However, I just bought the Sigma 50-500mm OS version. The serial number suggested that I got the newer version. The lens texture is also appeared to be different than the early lens. My guess is that they (Sigma) probably phased out all the older lens by now. If you are intended to buy it and are in the States, you can order it through Amazon, BHPhoto, etc... and check it out since they all have free shipping. Good luck w/ you lens purchase.

 

[ChrisHeathcote]

Hi Billy,
From looking on Sigmas website and at other reviews, it would appear that the lighter lens is the more recent one. Hope this helps and enjoy