Old Building Interior

Nice set of shadow patterns and detail on far wall. If this had been a lens it would only have been a little soft but a pinhole makes it outstanding. Exposure seems spot on. Was this a calculation from the smallest f stop on the meter then increasing the exposure accordingly and allowing for reciprocity failure?

Thanks for comments Pentaxuser. In answer to your question, all I did was take a meter reading @ f16 iso 100. I then looked at my little chart that I got from a pinhole website ( can't remeber which one, but I printed it out ) and it gave the 16 second exposure at f259 which is the f stop of my pinhole camera. Made the exposure and that was pretty much it. Simply, I know, but it worked.