Any rules of thumb for an ISO:aperture relationship for shooting fireflies? Dim little buggers that I don't image stand a chance of showing up at anything other than the wider apertures. I had no idea on my recent trip, so tried all sorts of things with Delta 1000 and NPH in an RZ. It was a great shot. I hope they show up. They were rising up in little one-second bursts out of the grass in an old graveyard outside of a WV coal mining camp at dusk. It was the first time I had ever seen them. The film is already shot, but won't be developed for a while. I am curious as to what I should expect.