Thanks for the help folks. Sorry if I was unclear, the lenses are all Sigma, and I live in the Scottish Border Region. I did look into this a few years ago, and asked two shops if I could try the lenses on a camera to see if they would work. For some reason they declined my request, and needless to say neither, received my custom. One was Jessops and the other an independant retailer.

dougf8, redefect, dedefect, who knows. Having started out on Praktica's back in the 70's moving onto the Pentax ME super(remember them)in the early 80's, I went through 4 of them, using them till they fell to bits (not a reflection on Pentax quality, more my rugged outdoor use of them). Finally got the MZ5 late 90's to move into the AF age, as I was having trouble trying to focus manualy.

God knows why I went for Canon Digi's, but within a few years I missed my old Pentax. My Sigma 170-500mm lens is knackered, and it's either fork out for a new 120-400mm to fit the Canon, or a new Pentax body and my old lenses, and I would rather spend the cash on a new Pentax body if the old lenses will work on it.

I'm considering dumping my Canon DSLR's and going back to Pentax, after using Pentax for years, back in the good old days of slide film. I still have my old MZ5-n body and the 3 Sigma lenses, that I used on it, purchased in the late 90's. Will these lenses work on the current range of Pentax DSLRs? The lenses are; 135-400mm F4.5-5.6 APO SerNo. 1018180, 100-300mm F4.5-6.7 APO SerNo. 1076885, and 28-80mm APO SerNo. 1190192. I have tried in vain to find someone local who has a Pentax DSLR, to try the lenses on, but I can't find anyone through my contacts who has one. Going through related topics on this site has not really heped, except that all the lenses have the A (auto?) marking at the smallest aperture setting on the aperture ring. Any help would be greatly appreciated.

Thanks
Danny