On 11/18/2017 2:11 PM, Ken Hart wrote:
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?


The Holga is a good camera for those who like to look of the images.
there are also pinhole and stereo models. Since it is a film camera,
unless you have a wet darkroom, and/or facility for processing film, the
only choice is a digital pinhole. When I wanted to play with a pinhole,
I went to a friend's basement, and he drilled a centered hole in a Nikon
body cap. I haven't been playing with it in the last few years. I have
been known to do other things on impulse, like buying a Lensbaby and
using it about three times in the last five years.

--
PeterN