<p>This has been an informative post for me. I wasn't aware of the film speed shift, but now that its been mentioned, I have spent some time looking at the exposure guide on the back on some Tourists that I have and wondered why the sunny 16 rule didn't apply.There is other Kodak documentation where the same thing happened.<br>
R100 is way overexposed, 50 would have bee about right, asa25 is quite usable down here, especially on sunny days. I had heard of chromatic aberration, but dismissed it for B&W film, but I have been corrected.<br>
The shots were over exposed, out of focus and with a bad light leak. I will fix these problems and venture out at a future date.<br>
Cheers</p>