The finished pinhole plate was blackened with BlackenIt, a mysterious liquid found in model railroad oriented hobby shops.
1 mil shim stock is pretty flimsy to handle -- I might suggest 2 or 3 mil for a first try. There are assortments of several thicknesses found in some hobby shops, auto parts stores and hardware stores. Often a K&S brand found with other brass strips and shapes for model making.
Ah I see, so you dimple it rather than pierce it and then when you sand the back of it the dimple gets sanded through before the rest of the material? I think some of the acid etched pinholes are dimpled around the actual pinhole rather than just a 90 degree hole as is with the laser etched ones which apparently gives a clearer image.
From my ancient days in etched parts, circuit boards, etc. it's almost inevitable that there is a slope to the etched edge, so that could produce a bit of a knife edge, even in a flat sheet.
Note: there is a page full of links to assorted and sundry pinhole information on the Worldwide Pinhole Photography Day website. Click on the 'Resources' link at the top. There are galleries there showing pinhole shots from all over the world on pinhole days back to 2001 or so.
By the way, WPPD is something to line up for in 2013, it's usually the last Sunday in April. I've been going out for that each year now since 2005. usually I try to record some sort of unique/historic spot in my area.
When I get some time I will post some shots from the pinhole made from a PBR can, sand paper, needle, and a black sharpie. I come from the school of KISS.
4x5 pinhole image:
very good!almost too sharp.
Jon, that shot does look really good, especially considering that there isn't actually an optical lens on the camera :D it would be cool to KISS but then again its probably not as easy with a DDS.
Here is a video on a beercan pinhole which is simple, but I can't really fit a 5x4 DDS in a beercan!
Actually using a double dark is the best way, your not fiddling around it dark bags changing film. All the information your getting her is good you could also head over to f295.org a dictated pinhole forum.