Chapter 4 CPP Study Questions
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  1. #1
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    Default Chapter 4 CPP Study Questions

    Ch 4 Light and Film

    Q1) A filter with a filter factor of 8 requires an increase in exposure of

    A) 8 stops
    B) 1 2/3 stops
    C) 3 stops
    D) 4 stops

    Q2) You would use a circular polarizer over a regular polarizer because

    A) you have an autofocus camera
    B) a digital sensor won't work with a regular polarizer
    C) it polarizes more effectively
    D) it requires less exposure compensation

    Q3) The most commonly used type of black and white film is

    A) Orthochromatic
    B) Infrared
    C) Blue-sensitive
    D) Panchromatic
    Mark Levesque, CPP, M. Photog., Cr. Photog, A.C. Ph., CPP Liaison, PPCC Judge

  2. #2
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    1 B

    2 A

    D D


    ...and remember folks I'm tring to do this without a book
    Moore Photography Inc.
    1625 South 25th St
    Terre Haute IN 47803

  3. #3

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    Q1) C

    Q2) A

    Q3) D
    Cassandra Sullivan, CPP
    Massachusetts CPP Liason

    Cassandra's Photography
    Here & There - The Blog
    "If you really want to do something, you'll find a way. If you don't, you'll find an excuse."

  4. #4
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    Ugh...

    D) 4 stops
    D) it requires less exposure compensation
    D) Panchromatic

  5. #5

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    1)c
    2)a
    3)d
    Did you miss me?
    Andrea Chapelo, CPP
    www.chapelophotography.com

  6. #6

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    1. C
    2. C
    3. D

    Can you post the answers tomorrow morning before I go to take the test? I'm curious about #2. Thanks Mark!

  7. #7
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    Ellen,

    The reflex mirror in an autofocus camera is semi-silvered to split the light--about 60 percent reflects upward to the pentaprism and about 40 percent reflects downward to the autofocus system. That semi-silvered mirror also acts as a polarizer--it polarizes the light that's being reflected in each direction.

    If you put a linear (regular) polarizer in front of the lens on an autofocus camera, you then get a double polarizing effect--which is heavy neutral density. You begin to cut off all light at certain angles.

    A circular polarizer polarizes the light (filters out all light waves that are vibrating out of sync with its set direction) and then gives that polarized light a "twist" so that it's effectively not behaving as though it's polarized. So you don't get neutral density when it strikes the mirror and gets polarized again.

    Notice this all has to do with the semi-silvered mirror, not the digital sensor. Cameras that don't use a semi-silvered mirror (most P&S digital cameras) can use regular (linear) polarizers just fine.
    Last edited by KirkDarling; 02-17-2008 at 12:57 AM.
    --Elephants can swim...
    ...and very gracefully.
    Knowing that,
    I do believe
    Anything is possible for me.

    Kirk Darling, CPP

  8. #8

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    Thanks Kirk. That's all new to me. So what you're saying is that point and shoot cameras can use linear polarizers, and other autofocus cameras need circular polarizers?

  9. #9
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    So what you're saying is that point and shoot cameras can use linear polarizers, and other autofocus cameras need circular polarizers?
    I can't speak for all P&S cameras, but the ones I'm familiar with don't have semi-silvered mirrors, so they can use linear polarizers.
    --Elephants can swim...
    ...and very gracefully.
    Knowing that,
    I do believe
    Anything is possible for me.

    Kirk Darling, CPP

  10. #10
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    Hint for a couple of you in question #1 (in a form of a question): Is a filter factor of 8, eight times more density, or....?

    hint, hint: a filter factor of 2 is 1 stop.

    hint, hint, hint: Think logrithmically like you would for f stops.
    Michael Gan,M.Photog.Cr. CPP,
    Meritage House of Photography

    If your business depends on you, you don't own a business-you have a job. And it's the worst job in the world because you're working for a lunatic... You can't close it when you want to, because if it's closed you don't get paid. You can't leave it when you want to, because if you leave there's nobody there to do the work. You can't sell it when you want to, because who wants to buy a job?
    —Michael Gerber
    http://www.meritageonmain.blogspot.com

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