Converting daylight film to tungsten

Do you find the use of an 80A satisfactory when using daylight film
with 3200 K lights ? Is there "something missing"? Would tungsten film
be better? Why? I have not problem with the speed loss. Is you 80A the
same color as mine. My Tiffen is bluer than my Nikon, which is slightly
greener, and called incidentally a B12.

Gregory Blank wrote:
In article . com,
wrote:


I'll also add this insight. Something I knew but didn't utilize, so
managed to forget, and that is reciprocity effects. Daylight film
with
a
80A filter will do well, until one starts shooting at 1/2 or less
exposure.
Because daylight film is optimized for higher speeds than tungsten,
the
lower speeds will not only lose exposure but will shift around
color
wise.
I got more green, so I gather that means the red spectrum falls
short.
Funny because long reciprocity exposures at night go purply. My
favorite word, for those interested in my personal quirks.
It might work to find just the right color correction, but I'm
going to
just buy the tungsten, and work it out from there. There as too
many
other color problems, ( aging tungsten lamps, less than pure white
diffusion materials, color shift bounce from setup ) to waste money
trying to save money bu shooting with less expensive Provia F.

I don't know a while back I was making three minute exposures with
Provia 100F and and 80A with a 4x5 and the color shift was not
appreciable. Try those counting 1 Mississippi.

--
LF Website @ http://members.verizon.net/~gregoryblank

"To announce that there must be no criticism of the President,
or that we are to stand by the President, right or wrong,
is not only unpatriotic and servile, but is morally treasonable
to the American public."--Theodore Roosevelt, May 7, 1918

This is why newsgroup "information" has the characteristic curve of a
roller coaster. So was the subject something of known color? I'm
shooting food, and a color chart, and have so far gone yellow green.
All I can guess at this point is aged tungsten bulbs and/or reciprocity
shift. Nothing else occurs to me. The film was in the freezer, is not
outdated, and as far as I know never saw high temps. Obviously I should
buy a brick and zero the color in, but I'm a regular ass when it comes
to doing things the right way.

In article . com,
wrote:
This is why newsgroup "information" has the characteristic curve of a
roller coaster. So was the subject something of known color? I'm
shooting food, and a color chart, and have so far gone yellow green.
All I can guess at this point is aged tungsten bulbs and/or reciprocity
shift. Nothing else occurs to me. The film was in the freezer, is not
outdated, and as far as I know never saw high temps. Obviously I should
buy a brick and zero the color in, but I'm a regular ass when it comes
to doing things the right way.

I have very good color sense, nothing bugs me more than color shift,
5cc in printing can drive me crazy. I think the tungsten might be
the root of the problem an 80A but usually warmer lights it will work OK
with.

It could be even who is processing it. A white background will show that
shift quickly,.....if you have any fluorescent ambient light anywhere
turn it off. Sometimes because I use long exposures
I see the green shift also mostly on white backgrounds, but its hard to
nail down,....my thoughts could be the lab and could be the film......or
light. With out a color temp meter its hard to pin down.

--
LF Website @ http://members.verizon.net/~gregoryblank

"To announce that there must be no criticism of the President,
or that we are to stand by the President, right or wrong,
is not only unpatriotic and servile, but is morally treasonable
to the American public."--Theodore Roosevelt, May 7, 1918

On 2005-01-13 11:35:51 -0600, Gregory Blank
said:

In article . com,
wrote:
This is why newsgroup "information" has the characteristic curve of a
roller coaster. So was the subject something of known color? I'm
shooting food, and a color chart, and have so far gone yellow green.
All I can guess at this point is aged tungsten bulbs and/or reciprocity
shift. Nothing else occurs to me. The film was in the freezer, is not
outdated, and as far as I know never saw high temps. Obviously I should
buy a brick and zero the color in, but I'm a regular ass when it comes
to doing things the right way.

I have very good color sense, nothing bugs me more than color shift,
5cc in printing can drive me crazy. I think the tungsten might be the
root of the problem an 80A but usually warmer lights it will work OK
with.

It could be even who is processing it. A white background will show
that shift quickly,.....if you have any fluorescent ambient light
anywhere turn it off. Sometimes because I use long exposures I see the
green shift also mostly on white backgrounds, but its hard to nail
down,....my thoughts could be the lab and could be the film......or
light. With out a color temp meter its hard to pin down.

Don't forget that the tungsten lamps' color temperature changes
slightly over the life of the bulbs. They shift as they age...

best

argon

On 2005-01-13 11:35:51 -0600, Gregory Blank
said:

In article . com,
wrote:
This is why newsgroup "information" has the characteristic curve of a
roller coaster. So was the subject something of known color? I'm
shooting food, and a color chart, and have so far gone yellow green.
All I can guess at this point is aged tungsten bulbs and/or reciprocity
shift. Nothing else occurs to me. The film was in the freezer, is not
outdated, and as far as I know never saw high temps. Obviously I should
buy a brick and zero the color in, but I'm a regular ass when it comes
to doing things the right way.

I have very good color sense, nothing bugs me more than color shift,
5cc in printing can drive me crazy. I think the tungsten might be the
root of the problem an 80A but usually warmer lights it will work OK
with.

It could be even who is processing it. A white background will show
that shift quickly,.....if you have any fluorescent ambient light
anywhere turn it off. Sometimes because I use long exposures I see the
green shift also mostly on white backgrounds, but its hard to nail
down,....my thoughts could be the lab and could be the film......or
light. With out a color temp meter its hard to pin down.

Don't forget that the tungsten lamps' color temperature changes
slightly over the life of the bulbs. They shift as they age...

best

argon

... nothing bugs me more than color shift, 5cc in printing
... can drive me crazy.

... My Tiffen is bluer than my Nikon, which is slightly
... greener, and called incidentally a B12.

... I have the same impression that a conversion filter
... 80A is different depending from what supplier it
... comes.

I find color conversion filters work fine for color negative.

For transparencies an 80x/85x is just a starting point. Sometimes
the resulting slide shifts to the yellow, sometimes to the green,
sometimes to the ...

I found a complete set of CMY/RGB 5/10/20 cc filters to be a
necessity. Luckily I bought them when wratten gels were $3.50
each. Nowadays a set would run ~$450 - today I think I would use
Rosco gels on the lights instead.

For daylight Ektachrome with tungsten photofloods I find the
additional correction needed is consistently 5cc Magenta.
It got so that I had B&W make one up in glass.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/