filmtovideo
Well-known member
Yesterday I was shooting 720P 24N, Cine D, 180 shutter film cam and I
used an open face Omni to bring an actors's face so that it had zebras at
70
IREs and then I dialed the iris down so that it still was at 2.8 but most of
the zebras were gone except for on the tip of the nose and a touch on
a chekbone.
I've found that I need a lot of light with the HVX-200 but when I
measured
the footcandles (with a Spectra Pro analog, an old one to be sure but one
that was checked on a Spectrometer last week and checked out okay)
i was getting above 400 footcandles depending on how much within 2.8
I adjusted to raise or lower the IREs. I say how much within 2.8 because
you can iris down or up and it will change but still read 2.8 until it jumps
to say 2.4.
Four hundred plus footcandles is a lot of light! That's what you see in an
an early 70s t.v. show with slow film stocks when a burglar is in the
bushes or two people are
talking in bed. There's such brightness that the burglar could read a
newspaper.
This makes the ASA about 25. I've heard people say that the ASA for
the HVX-200 is rated 320 but it's not linear so at the open end of the lens
it's about 160 ASA. Well, a 2.8 at 160 and 1/50th exposure is 64
footcandles according to a table on the Panavision website. If anything
then, it's not going to be more footcandles when going for 70 IREs at
2.8.
Does anybody know what's going on here? Also, I've been using the side
dial to adjust the iris and it drops from 2.4 to open with nothing in
between. I thought that you could get a 1.7 but I haven't seen it.
Thanks.
used an open face Omni to bring an actors's face so that it had zebras at
70
IREs and then I dialed the iris down so that it still was at 2.8 but most of
the zebras were gone except for on the tip of the nose and a touch on
a chekbone.
I've found that I need a lot of light with the HVX-200 but when I
measured
the footcandles (with a Spectra Pro analog, an old one to be sure but one
that was checked on a Spectrometer last week and checked out okay)
i was getting above 400 footcandles depending on how much within 2.8
I adjusted to raise or lower the IREs. I say how much within 2.8 because
you can iris down or up and it will change but still read 2.8 until it jumps
to say 2.4.
Four hundred plus footcandles is a lot of light! That's what you see in an
an early 70s t.v. show with slow film stocks when a burglar is in the
bushes or two people are
talking in bed. There's such brightness that the burglar could read a
newspaper.
This makes the ASA about 25. I've heard people say that the ASA for
the HVX-200 is rated 320 but it's not linear so at the open end of the lens
it's about 160 ASA. Well, a 2.8 at 160 and 1/50th exposure is 64
footcandles according to a table on the Panavision website. If anything
then, it's not going to be more footcandles when going for 70 IREs at
2.8.
Does anybody know what's going on here? Also, I've been using the side
dial to adjust the iris and it drops from 2.4 to open with nothing in
between. I thought that you could get a 1.7 but I haven't seen it.
Thanks.