CPP Exam Question Discussion
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  1. #1
    Join Date
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    Default CPP Exam Question Discussion

    Since the Light Ratio vs. Lighting Ratio question prompted so much discussion, let's start a new thread just for discussion of exam questions! I'll start us off by grabbing another sample question from the sheet. For reference, here is the link to the PDF of Sample Test Questions.

    Since we're not going in order anyways, I've chosen number 2!


    A particular filter used with black and white film calls for an exposure factor of 8X. Applying this factor to the intial exposure reading of 1/8 second at f/32 will require a new exposure of

    a. 1/8 second at f/22
    b. 1/8 second at f/16
    c. 1/4 second at f/22
    d. 1/4 second at f/16
    Betsy Finn, Cr.Photog., CPP
    bphotoart :: learnwithbetsy :: email

  2. #2

    Default Cool!

    I'll bite, I would say answer d. 1/4 @ f16. Why? 8X is four stops so slowing down to 1/4 gives you one stop, opening up to f16 gives you three more. 4 x 2 = 8.

  3. #3
    Join Date
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    Default

    I'll go with C. 8X is 3 stops. (1 stop is 2X, 2 stops is 4X, 3 stops is 8X), right?
    Mark Levesque, CPP, M. Photog., Cr. Photog, A.C. Ph., CPP Liaison, PPCC Judge

  4. #4
    Join Date
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    Default

    Both of you are half right. Mark is correct that 8x is 3 stops difference. But, C. is a 2 stop difference (f32 to f22 is one stop, 1/8 to 1/4 is 1 stop). D. is a combination of a 3 stop difference.


    Michael
    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

  5. #5

    Default

    Yes, It's 3 stops answer "D" is correct.

  6. #6

    Default Oops

    Gotta love multiple choice! Even though my reasoning was wrong my answer was right. LOL! Thanks for straightening out my math Mark, I forgot to double each time I go up a stop, and thanks for clearing up the answer Michael. So 16-22-32 is three numbers but only two stops difference. Man I KNOW that, why did I think it was three! JEEEZ. This is great, I had no idea I was this rusty. Next question please!
    Last edited by David_A._Lottes; 09-21-2006 at 04:45 PM.

  7. #7
    Join Date
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    Default

    Alright good work guys, D is correct according to the sample sheet as well. Next question!

    If focusing on the same subject at the same distance, what will happen to the image size if a 300 mm (12 inch) telephoto lens is used on a 35 mm camera compared to a 300 mm (12 inch) lens used on a medium format camera?

    (only 3 options)
    a. there will be a larger image size with the 35 mm
    b. there will be a smaller image size with the 35 mm
    c. there will be no difference in the image size
    Betsy Finn, Cr.Photog., CPP
    bphotoart :: learnwithbetsy :: email

  8. #8
    Join Date
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    NH
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    Default

    Same thing that happens when you take your 300mm lens off your full frame DSLR and put it on a camera with an APS (smaller) sized sensor. The image is larger and you end up with a multiplication factor.
    Don
    M.Photog., Cr., CPP, D.C.Ph.

    www.donchick.com

  9. #9

    Default

    A 300mm lens will project the same image size regardless of what camera it's mounted on. The correct answer is "C". The difference is the crop of the sensor or film size.

  10. #10
    Join Date
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    Default

    The image will be larger

    standard MM for 35mm is 50mm and for medium it is 80mm
    “The price of anything is the amount of life you exchange for it.” Henry David Thoreau

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