I just (no seriously, just) returned from an outing trying to photograph fireflies.
I found a location that has been under my nose for years and yielded more of the bugs then I have ever seen in my life. There must have been thousands. There were SO many I was able to focus off their light alone, which seemed like a vast bioluminescent carpet.
I had with me my tiny, $50 gossen "digisix" incident/reflective meter. The gully they were in was below the meter's capabilty, but I was able to take a reflective reading from the sky, about 4 seconds at f/5.6. I placed the sky on zone 7, although almost no sky was in the picture. Considering recipricoty, and with HP5 rated at 320 for PMK, I made my first exposure at a minute and thirty seconds, the meter read 30 at f/8 (or I guessed using the meter with the sky on zone 7), and bracketed a bit. Making a couple of exposures at 1 minute@5.6 and 30sec @ 2.8 (ok FINE, this was with my Hassy 500, but I might end up taking a 4X5 down there later)
I reasoned I probably would have only needed about a second exposure to portray their outrageous numbers. And on the ride back I began to panic that with exposures of longer than a minute, they wouldn't even show up at all!
Does anyone have any experience shooting fireflies? What's the shutter speed threshold where they start to not show up? The inverse square law must be involved here. I could take the time and test all this out, but I'm afraid they'll be gone by tomorrow! Plus I'm not sure I'm that intelligent, these bugs are about the trickiest things I can remember shooting. I made sure to write down the conditions; around 9:00PM, right before dark, 90% humidity, 73 degrees.
My goal is to capture not just the fireflies, but their enviroment as well.
Thanks for any help.
-Alex
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