I plan on going to St Augustine next weekend to burn a roll of B&W Ilford PanfF 50. The correction I have read is shutter speed (^1.45). So if I am factoring this correctly, a shutter speed of 30 seconds becomes 138 seconds. A shutter speed of 15 seconds becomes 50 seconds. Does this sound correct? I have also read to add 10% shutter speed? Internet pics of what I want to shoot. Edited to remove copyrighted images. Please provide links to photos to which you do not hold rights.