On my last day at the park I loaded Ilford Pan F Plus 50 into my Nikon FM2 camera. I chose to use the 28mm Voigtlander 2.8 and the Nikkor 50mm F2 lenses. It was a cool morning with light showers. I used a tripod and looked up the reciprocity failure compensation for the film to get the proper exposure. The Factor for Pan F Plus is 1.33. If you have an exposure that requires 2 or more seconds you enter the time on your scientific calculator then press the xy key then enter 1.33, press equal and you get your proper exposure. (https://www.ilfordphoto.com/wp/wp-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf) I am not one who understands math very well but I can follow directions. I developed the film in HC-110(B) for 4 minutes, @20C.