On 11/18/2017 12:42 PM, PeterN wrote:
On 11/17/2017 7:58 PM, RichA wrote:
snip

f/128 is the right diameter for a given sensor size, as I recall, but
that's a guess.Â* Precision pinholes cost money (consult a professional
optics house) and if they aren't precision, various unwanted
aberrations can creep in, notably, irregular diffraction.


The right diameter will vary with sensor size and the distance from the
hole to the sensor. Irregular diffraction will occur if the hole is not
round. Besides, some diffraction is part of the beauty of a soft focus
pinhole.



"the beauty of a soft focus pinhole."
Isn't that why they make the Holga?

--
Ken Hart