I just got my new D100 today. I hooked up my 80-200 Nikkor 2.8 AF. Everything works fine. I hook up the brand-new Sigma 28-70 F/2.8 EX Aspherical DF. Nothing works. The autofocus doesn't go. Nothing. I read ther instructions that came with the lens. Set the opening to the highest F number, lock the opening, attach lens.
Pat, I'm running the Sigma 15-30 and the 50 Micro on my N80 and D100 without any problems--both lenses bought new; Smile & Hunt.
When you say 'Nothing works' what do you mean?
1) does the display light up?--if so any error msg?
2) When you return the 80-200 to the D100 are you OK?
3) with the camera ON, connect the Sigma to the D100, dont worry you wont damage anything, does the D100 shut down?, if so when. Remove the lens, does the D100 come back to life?
4) If the microchip in the lens is 'kaput' your D100 should still be awake and display an error msg or blink. If there is an internal short in a power line in the lens then the D100 will look dead.
5) I assume 'just got' means the D100 was delivered from a store not nearby. Go to a local store and innocently check out another Sigma. If you have friends in the store try the Sigma in another Nikon or a friends Nikon.
6) Call Sigma and let them work for/with you.
I hope your 'highest' f number is the smallest size diaphragm aperature, like f22 or f32 not 2.8
It is most probable that the lens is defective, even if you carefully and properly connected the lens to the D100 without doing anything with the lens the D100 should be awake. While awaiting its replacement enjoy the D100 with the great lens you have on it now--you wont be able to put that dynamic duo down for a second!!
OK, this might be the problem.... I have a 50mm 1.8 (non-d) and I dropped this lens. No big deal, it's pretty light. The only problem now, you see it fell right on this little AI coupling tab on the apeture ring and it broke off. When I attached it to my new d100, the camera had absolutely no controls. Not even in manual.... so I checked it out. On the body, lens mount, right below the depth of field preview button, theres a small spring-loaded tab. This is where my 50mm and all other CPU lenses couple to.... it's possible that this lens might be missing it.... you might want to check. If it is, quick fix: just put something in there to hold it down.... sound odd but it works... my F4s doesn't have this but I guess newer bodies do.
How do you find the sigma lens? I have one and have found it to be very soft compared to my Nikon 24-120, and this isn't thought to be a particularly sharp lens. I battled with the sharpness in PS but now I have an S2 and can compare them without the intermediate step of my Coolscan it is obvious that my Sigma isn't great compared to the Nikon.
I had the same lens and it was a disapointment. It was bright but I could never get a clear picture at 70mm, if I got closer within macro range it was super soft.... there was also the noise.... very loud. I shoot with a simpler 28-105 3.8-5.6 sigma af-d lens at work and it was by far sharper... what's going on sigma?? Nikon will always be the better lens...