Using Barrel Lens

[Smitty]

How accurately can exposures be made using a barrel lens in ULF photography? It would seem that long exposures would be beyond the range of shutters anyway.
Thanks, Steve

[j.e.simmons]

Anything over a second, I use a metronome. You can set it clicking at 60 for one second intervals or 120 for half seconds.

[Jim Jones]

Practice counting seconds while watching a clock with a readout in seconds. It should be easy to achieve better accuracy than most shutters for exposures of 1/4 second and longer, and it's more convenient than relying on some gadget.

[Two23]

How accurately can exposures be made using a barrel lens in ULF photography? It would seem that long exposures would be beyond the range of shutters anyway.
Thanks, Steve

For one second I just say, "One potato." For multi seconds I use the stop watch function on my cell phone, just like the old timers did.


Kent in SD

[Smitty]

With the barrel lens just hold a piece of black cardboard in front of the lens then make the exposure?
Steve

[AtlantaTerry]

I just count slowly in my head. After all, long exposures with black and white film don't need to be very accurate. With transparency film, that may not be the case. On the otherhand, I once made a 30 minute exposure on a 4x5" sheet of Tungsten film.

[Randy]

For one second I just say, "One potato."

For two seconds I say "two potato"...and so on...but my negs come out a tad under exposed for some reason.

[John Kasaian]

For two seconds I say "two potato"...and so on...but my negs come out a tad under exposed for some reason.

Try" one zucchini, two zucchini..."

[Vaughn]

With the barrel lens just hold a piece of black cardboard in front of the lens then make the exposure?
Steve

Or lens cap. I work the cap almost all the way off first.

I have counted up to 15 minutes -- a bit boring.

[Alan Gales]

Or lens cap. I work the cap almost all the way off first.

I have counted up to 15 minutes -- a bit boring.

What were you doing, Vaughn, star trails?

I have seen photographs shot in old run down factories, hospitals and churches shot at long exposure times like that.