Sigma 18-300mm f/3.5-6.3 DC Macro OS HSM Contemporary - Pentax Fit - OS or not OS?

I am a little confused about the descriptions of this lens on different web sites. Some say that the OS (Optical Stabilisation) is not available with the Sony or Pentax mounts, others do not mention this and all they say is that the lens has a new OS system.

So my question is who is correct? Does anyone know for sure who is right for a Pentax fit lens?

Stuart

https://www.sigmaphoto.com/18-300mm-f35-63-dc-macro-os-hsm-c.

They say Sony and Pentax have no OS option. Which, with in body OS, makes sense.

Yep, optical stabilization built into a lens intended for a Pentax camera would be redundant, so third-party lens-makers understandably leave it out of variants of their lenses designed for attachment to a Pentax (while frequently building OS in to variants destined for Nikon, Canon etc).

They don't always, the Sigma 150 - 500 still had OS in the lens. It had an advantage over the Pentax OS system, in that the viewfinder image was also stabilized

Happy to be corrected. I hadn't thought of the benefit of stabilization of the viewfinder image -- certainly useful, I imagine, for longer lenses than those I tend to use.

You may well be correct about the latest third party lenses, the 150-500 was a while ago now.

Yes that's why I was a little confused because I have the Sigma 150-500 lens and yes I am able to choose either OS system when using that lens, obviously only one or the other. It does indeed have the advantage of seeing a stabilised image in the viewfinder as well when using Sigma OS.

I did ask Park Cameras about this as they dont mention it on their website but their reply was less than useful.

Stuart

I'd try SRS, usually great service