This past Saturday on a very gloomy and dull morning I went to High Park with my Mamiya RZ67, slow speed fine-grained films and of course a tripod. Exposures were often 1 second more, so any moving people in the image would be a ghostly blur. I like the effect!

Mamiya RZ67 on tripod, Rollei RPX25 film developed in Rodinal
Exposure: 1 second