"Three pinholes: (A) .150mm, best focal length 16mm, 150 seconds; (B) .259mm, best FL 48mm, 50 sec.; (C) .460mm, best FL 150mm., 15 sec. All shots taken with Canon EOS 400D, APS-C sensor, approximate hole-to-sensor distance 50mm. Diffusion degrades A, too-large aperture degrades C, B is optimal."
"Nothing fancy, just a body cap with an improvised rubber holder for laser-drilled pinholes in stainless steel from Christiansen Gallery. Best focal lengths and my exposures were derived from their included information sheet."