A few macros for you
Very nice. The Sigma works well for me as well, though the AF is not quite the equal of Nikkor lenses...more hunting, more missed AF, more need to manually fine tune. However, it is very sharp and is capable of good photos as you've shown. Agreed about VR. I believe a newer version is available with VR.
Very nice, or not so nice depending on how much you like bugs eating bugs!
Sigma makes a couple macros with OS, they run a grand plus/minus.
Nice series. What luck to have the mantis catch the bee!
I have the Sigma 150 f2.8 non-OS macro. It is a superb lens. I find it difficult to want to use any other lens. I don't have a Nikon 1 body - I shoot with a D300 and D90. But I am looking into how a V2 would work with my Sigma 150 as well as a Nikon 300 f4 (potential purchase). So, it was good that I found your examples here.
fwiw / imho... I don't think that the OS would be that much help for these shots. To help prevent the AF hunting, use the AF limiter switch for close-ups like this.
Some ideas... Without knowing the features of the V2... Based on my DX camera bodies... I would try to increase the shutter speed to freeze the movement and increase the aperture for more DOF. With f7.1 at this close distance with a 150mm lens on a CX sensor, it "may" be just a little too "wide". However, the wasp looks like it had some movement and the focus was in front of it somewhat (toward the camera - front focus). For shots like this, I usually stop down to about f10 -f11 with a min shutter at 1/800 sec. I do this by bumping the ISO (via Auto ISO) and underexposing by about .7 or even 1.0 depending on the metering method and the light. For a dark subject like the wasp on a bright background, matrix metering would underexpose the wasp which could be dealt with in post.
Shooting moving insects in mixed lighting conditions is "tricky" to say the least. Often it is necessary to do a burst of shots to get a "keeper". I'm not a tripod person. I prefer to sit down on a portable stool and then brace my elbows on my knees. This provides me with enough support and at the same time, much flexibility.
Thanks for posting your images with the Sigma 150 and V2.