I was in the process of selling my Mamiya 7 kit and lens. However, as a result of scanning a load of 6x7/6x6 slides decided against the sale. So, back to real film. What aperture/speed settings would anyone suggest for night images of illuminated building/fountains etc. I have a preference for small apertures at about f11-f16. I would normally use a hand held meter during daylight hours maybe using a gray card. Moving to digital is great fun but it made me lazy and forgetful!