RAPID SURVEY: what you prefer

[Poliestere]

Sooper8fan,
can see my S.8 Kodachrome frames here: viewtopic.php?t=12302
8)

[Mitch Perkins]

The neg stocks do have greater lattitude and thus are easier to telecine.

Man, you got that right!

Mitch

[audadvnc]

5) It is not an urban myths: the values of L. E. of the film Ektachrome 64T come from rigorous tests executed from the same Kodak on its materials (also b/w, polyester base, triacetate base, also on invertible color films how Ektachrome) in years ' 90, and calculating such values on a type of "domestic" conservation of the film (from test carry out , turn out that to every increase of temperature of approximately 5 C° the duration of coloring of the film is halved: the speech is rather along and complex, with my English it is too much difficult to explain for me, however the data that I have indicated are many real.)

References, please. Sources? Papers? Studies? Web sites?

Nobody doubts that K40 lasts longer. But I need more hard evidence other than some poster's say-so before I'm willing to swallow the 25-year line.

Here's an example of what I mean. Notice their 40-year demarcation:

http://www.fotoinfo.com/technicalinfo/stability.html

Their quote on Ektachrome in light and dark storage goes like this:

Ektachrome

"Ektachrome films under fluorescent lights (5.4 klx) have the magenta layer fading the greatest or the thus making the color shift in the green direction. It appears on the graph that a .1 density decrease will occur in 20 years. The cyan layer has a .1 density decrease in a 100 plus years and the yellow layer in excess of 160 years. So if you leave your slides on a light table for a long time you may get a color shift.

"This is where different types of light have different effects. The Ektachrome dyes under tungsten halogen light (925 klx) will have a .1 density decrease in the magenta layer in about three hours and the cyan layer in about 4 hours and the yellow seems the most stable. This means the film will fade to green- green yellow. This is good compared to Kodachrome dyes.

"Ektachrome under dark storage has the yellow dye fading. The literature indicates a .1 density decrease in about 40 years. That would mean your neutrals would appear blue because blue is not being absorbed as much."

[Poliestere]

Hi Robert,
excuse if I answer you in delay.

I have read with attention the test of H. Wilhelm, and its data confirm mine about the duration in the time of the Kodachrome and the Ektachrome: you comprehend that its tests have been execute to these conditions: temperature of 24 °C and 40 % relative humidity. These are optimal conditions of conservation (above all for the relative humidity), while my values refer to conditions of domestic conservation, calculating one medium temperature of the 24-25 °C (practically the same of the H.W. tests), but with one relative humidity of 50-60%.

And is this parameter that make the difference, in fact the color film is much sensitive to the humidity, its life utility is shortened drastically to every increment of 10% from the optimal value of 40%... To new evidence of that, watches the table published on the The book of film care (Publication Kodak N. H-23X CAT 172 1836):
http://www.mondestremo.it/save_kodachro ... 20film.jpg

to every increment of 20% of the relative humidity the expectancy life of the film to colors is halved!

Therefore, you make the calculation, in the H.W test. to 24°C and RH of 40% the Ektachrome has a L.E. of 40 years, second the Kodak table with RH of 60% has a L.E. of 20 years, second my parameters (50-60%) has one L.E. of approximately 25 years... Same speech for the Kodachrome, from the 90 years to 24°C and 40% RH is arrived to c.a 60 years to 24°C and 50-60% RH.

As far as the degradation of the Kodachrome if exposed to the light, this is a problem in the case of normal diapositive, while in the cinematographic film case the problem does not exist: during each projection, the frame cine is exposed to the light of the lamp only for 1/24 of second, therefore every 24 projections the photograms receive 1 second of light, in order to arrive to the limit indicated from the H.W. test (1,5 hours of exposure to the Tungsten-Halogen light) =5.000 secX24 = beyond 100.000 projections of the film (even if project your Kodachrome 1 time film every day , would employ about 300 years!)

poliestere

[vidwerk]

For my next shoot, I will be using either 7240 cross-processed or Tri-X. Maybe both.

vidwerk.

[VideoFred]

in fact the color film is much sensitive to the humidity, its life utility is shortened drastically to every increment of 10% from the optimal value of 40%...

to every increment of 20% of the relative humidity the expectancy life of the film to colors is halved!

Here is the evidence:



This 1975 Kodachrome Super-8 film was put away in an old barn..
At some of this footage I can just wipe the emulsion off.
Strange, but other reels are still in perfect condition. (same storage)
Even parts of the same reel are different.

Maybe water was dripping on the reels?

Fred.

[sooper8fan]

All this talk about the life expectancy of different film is good, but it seems like some of the "victim film" is that from many years ago that maybe wasn't stored so well. I know that since I've started shooting Super8 again, I make sure all my film reels are kept in a cool dry place in my office....where no water will drip onto them, or large amounts of dust will collect on them, etc. Don't all of you take care of your film too?

[Poliestere]

Councils for one optimal domestic conservation of the films:

Storage your films:

1) to the dark;
2) in a cool and dry place; if you have the doubts (above all for humidity, you can't feel it), measured the temperature and the rate of relative humidity with a digital thermometer/hygrometer. Make attention to the relative humidity rate (above all in the case of color films), in case of excessive humidity rate (beyond 50%), council to acquire a de-humidifier. In this case you can catch up the optimal value that is 40% of relative humidity.
Generally, the speech temperature is less critical, since medium the medium domestic temperature is near the 24 °C (however inferior temperatures increase the L.E. of all the films, colors and b/w).

Holding under control these two parameters, will increase considerably the L.E. of yours films to colors and also b/w (as an example, the better color film in commerce, the Kodachrome, kept to 24°C and 40% RH have one L.E. of about 90 years!)

Poliestere

[cineandy]

64t is grainy and lacks the kodachrome bite. 64t has to be your last option. k40, wittner 50.

[Arislan]

Kodachrome 40: Heaven's gift to filmmakers, which means Kodak is being taken over by the :twisted:

My choices are: K40, K40, K40. When that is finally done I'll move to Fujichrome 25.

[John_Pytlak]

For films that will have prints made for theatres, or transferred to video, color negative films are almost always a better choice than reversal films. Reversal films represent a tiny percentage of the motion picture market, whereas the color negative market continues to grow and had one of its best years ever in 2005.

[T-Scan]

64t is grainy and lacks the kodachrome bite. 64t has to be your last option. k40, wittner 50.

I've shot about a dozen carts of 64T so far. It's a little grainier than K40 but with better colors and not muddy or overly contrasty like K40. The 100D in S8 would have grain like K40 and colors like 64T... Thats what folks should be thinking about, instead of all this endless K40 sulking.

[John_Pytlak]

Again, the choice of E64T was based on the preferences expressed in most customer interviews worldwide to have a tungsten balance film in the same speed range as K-40. A smaller percentage wanted a daylight balanced film, which would likely have been 100D 7285.

The choice had to come from one of the existing EKTACHROME E-6 films, optimized for Super-8:

[tlatosmd]

64t is grainy and lacks the kodachrome bite. 64t has to be your last option. k40, wittner 50.

There never will be any 'Wittner50'. What will be there however will be Wittnerchome40 (being K40 in disguise) and, already, Velvia50D.