Hi, Dr E D F Williams wrote: > > I've been meaning to drill a lens cap (or thin plastic disk) and attach an > aperture with a small hole -- say 300 - 500 um -- to improve depth of field > for similar experiments. You should be able to achieve f128 with a small > enough hole. And since your objects are not likely to move you can exposure > with multiple flashes on 'B'. > > A way to make an aperture might be to prick a hole in aluminium foil and > stick that over a larger hole in the cap or disk. To blacken the foil, after > the work has been done, hold it over burning benzene (perhaps paraffin would > do) in the lid of a jar. To be carried out in the open air away from your > dwelling. > > Now we need an expert to calculate the size of the holes needed.
I'm sure I've got either this information in a table or a URL for it somewhere. Will get back to you asap. Anyone need a travelling microscope for measurement? mike
