RE: [pinhole-discussion] Determining correct aperture (wasRE: pinhole photography)
I see exactly what you mean. Thank you very much for clearing up my confusion! -Original Message- From: Guillermo [mailto:pen...@rogers.com] Since pinhole is not an exact practice and since pinhole exposures tend to be more underexposed than overexposed and since for practical reason is best to use full stops rather than fractional, the wise thing to do is to approximate f/160 to the next smallest full stop, f/180 in this case. Guillermo ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/
Re: [pinhole-discussion] Determining correct aperture (wasRE: pinhole photography)
Shelley, First, pinhole photography's technical aspects are not different from those of glass lens photography, and that includes f/stops. So you can get/make pinhole apertures that would give you f/stops that CLOSE DOWN in the same sequence of full stops you are use to with glass lenses, i.e., closing down from f/16 to f/22 to f/32, f/45...,f/128, f/180, etc. that unfortunately would require to make pinholes to the proper sizes that would give you the above aperture numbers. More often than not we end up with f/stops that aren't full stops, like f/160. As you can see, f/160 falls between f/128 and f/180, one could make the math calculations and find that f/160 is just about equal to f/128 +2/3 stops. Since pinhole is not an exact practice and since pinhole exposures tend to be more underexposed than overexposed and since for practical reason is best to use full stops rather than fractional, the wise thing to do is to approximate f/160 to the next smallest full stop, f/180 in this case. Guillermo
[pinhole-discussion] Determining correct aperture (wasRE: pinhole photography)
Ray, I have a question. Looking at these charts for the camera that was created, the aperture was determined to be at f160. Yet when looking at the 'f16 rule applied to pinhole', it states to use the times for an aperture of f180. Why is this leap made- and would you stop up like that with any camera? Thanks, Shelley -Original Message- From: Ray Beckett [mailto:r...@pinholephotography.com.au] http://pinholephotography.com.au/Theory/theory.html and have a look at the Project Exposure page. Always but always use the doubling or halving of time approach to determine the best exposure for your new pinhole camera: http://pinholephotography.com.au/Project/Darkroom/darkroom.html and above all Have Fun Regards, Ray
