What is the difference between Kodachrome PKR and KR film?

Gatsby1923

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Quick question,
What is the difference between Kodak PKR 135-36 Kodachrome 64 Professional Color Slide film and Kodak KR 135-36 Kodachrome 64 Color Slide Film other than a few dollars?


Dave M
 

reellis67

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I've never been able to tell the difference from the finished transparency, but some will tell you that it is aged to a certain point, or something along those lines, which just sounds fishy to me. If there is a difference, it must be something that takes more than the naked eye to detect (or at least a younger eye)..

- Randy
 

Roger Hicks

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Gatsby1923 said:
Quick question,
What is the difference between Kodak PKR 135-36 Kodachrome 64 Professional Color Slide film and Kodak KR 135-36 Kodachrome 64 Color Slide Film other than a few dollars?


Dave M
Click to expand...


The Party Line, when it came out, was that it was perfectly on spec (no speed variation or colour correction).

Cynics suggested it was a way to charge more for the same thing.

Probably, no-one knows -- or to be more accurate, those who know, won't say, and those who (like me) say, won't know.

Cheers,

R.
 

GeorgK

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Hello.
It was said that the "professional" films were favoured above the "amateur" films in the processing line, so turnaround time was shorter.

Regards
Georg
 

PKM-25

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I am working with the top Kodachrome guru at Kodak right now, I will ask him.
 

KenS

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PKR vs. KR

Gatsby1923 said:
Quick question,
What is the difference between Kodak PKR 135-36 Kodachrome 64 Professional Color Slide film and Kodak KR 135-36 Kodachrome 64 Color Slide Film other than a few dollars?

Dave M
Click to expand...

The way it was explained to me in the days when I used to buy it by the case, was that the PKR was "stored/aged" by Kodak such that the colour balance/speed was closest to 'neutral' when shipped such that they would stronly recommend refrigeration to 'delay' any further colour balance changes until use in camara. The KR would be shipped out a litttle earlier with the hope that with the oft times lengthy 'sit' on the non-refrigerated 'retail shelf', and the attendant colour 'shift' towards magenta would still have the colour balance fall within acceptable limits.

Ken
 

Michel Hardy-Vallée

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But given that Kodachrome has no incorporated dyes, how would aging change the color balance? Emulsion speeds? :confused:
 

bob100684

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mhv said:
But given that Kodachrome has no incorporated dyes, how would aging change the color balance? Emulsion speeds? :confused:
Click to expand...

if im not mistaken it does have the couplers however
 

Michel Hardy-Vallée

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Right... But remind me the difference between a dye and a coupler, though? It's one part of the technology I haven't understood properly!
 

bob100684

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The way I understand it, the dye itself is what gives the color, the coupler is what attaches the dye. Even with the same dyes, different couplers could give slightly different colors or contrast.
 

wirehead

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I look at Tech Pub E-6 and to me it implies that it's not that the pro films are stored/aged but that they tweak the formula slightly... but to the same effect.
 

Photo Engineer

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Guys everyone is part wrong and part right.

A dye is formed from a coupler. E6 film has couplers and forms dyes in the developer from the developing agent.

Kodachrome contains no coupler. Dyes are formed in 3 color developer solutions which contain a coupler and a developing agent.

Kodachrome and E6 films may contain sensitizing dyes which cause sensitivity to colors, and also may contain trimmer dyes which adjust speed. They may also contain acutance dyes which affect sharpness. These dyes wash out in processing

Professional films generally differ from consumer films in several important ways. (This following is a generalization).

Professional films have lower contrast than amateur films. Amateur films are assumed to be used in less expensive cameras with more lens flare and that amateurs want higher contrast with more zip. (this is probably a false assumption nowdays)

Professional films are built to a tighter color balance with respect to neutral balance whereas amateur films vary just a bit more around the center balance point.

Professional films are generally more pushable, have better raw stock keeping, latent image keeping and better reciprocity failure, but in some cases this is not true, as the professional is expected to keep his film more carefully and expose it more carefully.

I cannot comment on the current formulations but those are some general guidelines. To do this, the formulas are tweaked chemically when the emulsions are made or the coating is made.

PE
 

wirehead

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Hm.

Just to be on the safe side, I should prolly order some 200 so that I might fulfill my goal of doing a micro-version of the Kodachrome Project. :/
 

bob100684

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the last box of kodachrome 200 i got came labled as kodak select....they did the same to royal gold right before they switched it to high def
 
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