>>3292968Well, it is finished. I need a laser to get these pinholes perfect. The pinhole I have in this one is best for a focal length that's 2mm shorter. I was able to get it down to 23.5mm focal length; better than expected. I was able to use a funnel shape using aluminum sheet metal. That took forever and it is still a pretty tight fit installing the cap, but it isn't harming anything. Here's the specs below and some pics. Nothing like a pinhole to let you know you need to clean your sensor. lol
Invasive Pinhole Cap:
Focal Length: 23.5mm (35.25mm equivalent on 1.5x crop)
F-stop: f/120
Optimal Pinhole Diameter: 0.2042mm
Actual Pinhole diameter: 0.1957 (0.2042mm is optimal, error of 0.0085mm; best for 21.5mm FL)
Image Diameter: 45.1mm
Invasive into Camera Body to: 23mm
Angle of View: 36.7 (on 1.5x crop)
Sunny Day Exposure: 1/2 second at ISO 100
I'll play around with this tomorrow and calculate the DOF to find out the actual closest distance it can do. Though, the round in this image are only like 3 inches from the flange of the camera body. The FOV seems to be almost exactly the same as my kit lens set to 26mm. I'll probably attach an empty UV filter to the front, at a later date, so I can add gear to it if there's no vignetting.
