<< However the pentax hood on my 100mm f2.8M [49mm] finally broke yesterday [not bad after 20 yaers] and I can't think of alogical replacement for that .....................any body any ideas ? >>
Short of the obvious, an OM 100mm F2.8 hood seems ideal. It's a rigid rubber type that won't explode when you eventually drop it. Regrettably no longer available new, since Olympus stopped selling all the SLR gear this month. Kind regards Peter