If Carlsberg made lenses they probably would not use Grolsch cans I'd often wondered just what sort of image you would get from a pinhole camera. In a mad moment last night I took my penknife to a couple of empty (and bone dry) beer cans and made a hole with a tiny screwdriver in the base of one. I then taped the topless can onto an extension tube I use for macro The only thing I could take a picture of with my new 225mm ish lens was my 19" screen from about 15 foot away. It made a lousy blurred picture but it did work Can you tell what it is? Then I thought I'd have a go at a wider angle.... another empty can.... this time a hole with the tip of a needle. impossible to use in the evening so this morning I took it outside. Nice soft image with 10 seconds exposure With a bit of luck pictures of the lenses ( ) and the pictures they took should be attached. Pinholes show dust on the sensor like nothing else! Could not see anything in normal shots but I cleaned it again anyway.