4 Stop Bulb Ramping Test

Shot with the Nikon D300s, Sigma 10-20mm f/4-5.6 @ 20mm, f/6.3.

There's some serious vignetting on this, basically due to the fact that I had 13 stops of ND over the end of the lens in order to be able to get 16 second exposures in the middle of the day (I didn't want to stop the lens down to much on each shot and risk aperture flicker).

On the end of the Sigma was the 77mm B+W 10-Stop ND filter, and then the Cokin P holder with a Cokin 3 stop ND filter.

Controlled externally via an Aruino Uno, a couple of 4N25 Optoisolators and a little bit of coding that allows me to shoot shutter speeds ranging from 1 second to a hair over 5 Nonillion years (30 zeros) in 128th stop increments.

In reality, I don't think I'll ever be doing exposures longer than a couple of minutes, let alone several hundred billion billion times the estimated age of the universe. :)

Category:

Science & Technology

Tags:

• arduino
• intervalometer
• ramped
• bulb
• mode

[kaouthiavideo]

@kasperlaerkesen Haha, yes, you'd need quite a few stops of ND over the lens for a shutter speed that long. ;)

Thanks Kasper, I'm planning to get more up over the coming months (perhaps not on this channel though, so stay tuned and I'll keep everybody posted!)

[kaouthiavideo]

@kasperlaerkesen Thanks. I've been slacking the last few months, but have a bunch of things I've been wanting to do for a while and get up on here. Hopefully I'll have the time free to get some of them done now. :)

[kasperlaerkesen]

haha, and yet, more than likely, as this video demonstrates, all you would end up with after "several hundred billion billion times the estimated age of the universe" of open shutter, is likely to be a vastly overexposed square xD (or martian? not sure). I'm enjoying rummaging through your videos btw^^, they're quite interesting!