@Randy
According to the people at Ondu, the pinhole size is 0.5 mm
@John
Yes, I did scan the image (Epson V750). And there is probably a little bit of sharpening used in post processing (Lightroom). I recently switched from lightroom to dxo photolab, and that program can even pull more detail from the scan than LR. But the image shown here is the older LR version.
If the use of x-ray film has any advantages, I don’t know. Because the x-ray film is double sided, it is believed that sharpness is little less than ‘normal’ film.
The only thing that I didn’t mention yet, is that I use a filter inside the camera. It’s a old b+w Y/G filter, that I mounted behind the pinhole in the hope to get more cloud detail on x-ray film. If this has a positive effect on sharpness on x-ray film, I don’t know.
When I pulled this negative from the development tray, it was clear this image was very sharp for a pinhole. Since then, there have been several discussion about the how and why. I’m just guessing just as anybody else.
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