Many thanks for your reply:

A search on the Yahoo! server returned an amazing number of URLs concerned with pinhole photography ...

Precision pinholes are available (http://www.yatcom.com/pinhole/PINHOLE.html). The Pinhole Resource offers 11 precision pinholes laser "drilled" in brass shim (ranging from 0.10mm - 0.76mm) and 12 micro-drilled in stainless steel (ranging from 0.0039" - 0.0276").

I take your point about reciprocity failure, and clearly some experimentation wi ll be necessary. However, tables of optimum focal lengths, best aperture diamet ers, equivalent f-stops and exposure factor for f/22 are available (http://photo .net/photo/pinhole/pinhole.htm).

As regards using the lightmeters in my cameras, just for the record, they're not all 35mm models: (1) APS (2) 35mm (3) medium format. I suppose I could use the light meter in my Canon EOS, but it would be a bit cumbersome - however, I feel that a handheld lightmeter would be more useful.