Has anyone had experience of re-chipping the older 'film' lenses for use with Canon digi bodies?
There's an awful lot of older Sigma 400mm f/5.6 glass about going for very cheap money.
We had some experience of an older 28-200mm Sigma which kept displaying an err99 message on a 300D body.
In this case the lens wasn't worth much, and a replacement was sought , but surely the bigger optics maybe merit some modification/time and effort spent on them?
Maybe there's a definative list of lenses that can be modified, somewhere?
