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01-29-2014, 11:37 PM   #1
rup
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color negative films

hi .. this is for exam preparation purpose. can anyone please answer these :
1) what are the two types of color negative films?
2) how do you correct lens aberration?

01-30-2014, 01:37 AM   #2
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1) There is color positive and color negative film. But two types of color negative?
2) What lens aberration? Distortion, CA, coma? And where do you want to correct? During lens design, in post? Analog or digital?

Need more input...
01-30-2014, 03:30 AM   #3
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QuoteOriginally posted by splash_fr Quote
1) There is color positive and color negative film. But two types of color negative?
Well, if I think hard, I could come up with this suggestion: 1.a) Most colour negative films incorporate an orange (or otherwise colored) mask - but 1.b) there are actually a few that do not. Perhaps(???) the answer could be 1.a) Colour negatives for printing and 1.b) Colour negatives for scanning.

QuoteOriginally posted by splash_fr Quote
2) What lens aberration? Distortion, CA, coma? And where do you want to correct? During lens design, in post? Analog or digital?
Need more input...
You're absolutely right.
01-30-2014, 04:36 AM   #4
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Perhaps you mean what are the two types of colour film? The answer would be negative (print) and positive (slide).

01-30-2014, 07:20 AM   #5
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QuoteOriginally posted by rup Quote
hi .. this is for exam preparation purpose. can anyone please answer these :
1) what are the two types of color negative films?
2) how do you correct lens aberration?
What do you mean by "type"? The companies that manufactures them? The various models made by each manufacturer? The different chemical formulations of the films and processing protocols?
01-30-2014, 08:17 AM   #6
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or do you mean color film for daylight and for indoor?
01-30-2014, 05:04 PM   #7
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The question is very vague, either you've paraphrased, or the examiner who wrote it isn't particularly good.

Perhaps it refers to format?

Colour negative film is available in 135 (35mm) format, and 120 format (medium format) commonly.
But even then, there's more than two kinds, there's 110 format, 220, 620, 4x5, and probably many others I'm forgetting.




Lens abberation is usually fixed during manufacture of the lens, the specific method of fixing it depends on the kind of abberation.
Usually it is a mixture of positive and negative lenses used in unison to minimise flaws, but it can never be 100% since fixing one flaw may induce others, so manufacturers find a balance.
Some a better at this balance than others, hence some lenses are better than others.
01-31-2014, 12:48 PM   #8
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QuoteOriginally posted by First Poster Quote
1) what are the two types of color negative films?
Daylight and Tungsten Balance?
Still and Motion Picture?
Consumer and Professional?

QuoteOriginally posted by First Poster Quote
2) how do you correct lens aberration?
A condition when the shape or configuration of the lens does not properly render the image properly... ?
A simple fix is to Stopping down?

02-11-2014, 10:05 PM   #9
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I am thinking two types of film? one being a "negative " (c41) the other being a positive.. or a slide (E6) ... a color negative has forgiveness in the capture but an E6 not so much .. so if you are shooting slide , have your exposures dead on.

---------- Post added 02-11-14 at 10:08 PM ----------

are you talking lens abberation caught on film or digitally?
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