Thanks koraks and georg16nik. I think the practical answer on lead-lined boxes may be don't worry about them just use the D3200 quickly The cost to benefit ratio of lead lining for fast films is at best problematical. Indeed the diktat of financial prudence in general and from what I've seen of what HP5+ at 1600 and possibly 3200 can do, indicates that it is the one to use
Indeed over a lifetime and the way film prices are rising, especially fast films, it may be possible to save enough money by buying HP5+ instead of D3200 and then buying a lead lined box for nuclear Armageddon instead. That plus a reasonable supply of Andy O'Neill's favourite donuts, apple fritters and some Labatt lager might save me
pentaxuser