Looks like my sigma macro lens is knackered again. A year or more ago the limit switch jammed and I had it fixed. This evening I inadvertently flicked the switch and now the blasted thing grinds like crazy although will work on manual - but keeps making rather a lot of noise I've tried it on both cameras just to make sure.
Now - do I get it fixed again or think about replacing it with something else? I've always fancied a longer macro but am not sure the cash-flow right now is up to a new lens.
bum bum bum bum bum bum etc. etc.