Phototuts+ Quiz: Lenses
basix

Phototuts+ Quiz: Lenses

on Aug 11th 2011 with 28 comments
This entry is part 2 of 5 in the Photography Quizzes Session
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Today, you’ll have another chance to try one of our Phototuts+ quizzes. You’ll be able to test your knowledge by answering some nefarious questions. We’re starting out by probing your basic understanding of lenses. Get crackin’ after the jump! And don’t forget to share you results in the comments.

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I was raised in the suburbs of Cincinnati, Ohio. After high school, I left for Western Kentucky University where I obtained degrees in photojournalism and cultural anthropology. I am currently employed by CityBeat, an arts and entertainment weekly in Cincinnati. The work I am doing here is very rewarding and I suspect it will continue to be. I am available for freelance work in all areas of photography.  

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  • http://www.sjoerdbooij.nl Sjoerd Booij

    I scored 73,3%. I have a question though. I think that question 6 has the wrong answer or is formulated in the wrong way. You are asking which lens on other digital dSLR’s has the same FOV as a 50mm on a full frame camera. This must be a 35mm lens, because on smaller sensors (which I assume you talk about) you have a focal multiplier of around 1.5. So, a 35mm lens on this smaller sensor camera is around the same FOV as a 50mm lens on a full frame sensor.

    Though the answer you say is right is 75mm. This means either the question is formulated wrong or the selected answer of 75mm is wrong ;-)

    Please do correct me if I’m wrong…

    • http://flickr.com/ma2thew ma2thew

      If you take a 50mm and throw it on a dSLR with a cropped sensor, you would end up with a focal length of around 75mm. Which I’m guessing is what the point of the question was, the question was fairly confusing.

      • Ken

        That wasn’t the question. It asked what focal length would have the same FOV on a cropped camera as a 50mm on a full-frame. That would be 31.3mm.

    • Aditya

      It says 50mm on crop == ? on full-frame. (field of view)

      75mm is right (assuming a crop factor of 1.5)

  • http://www.ideaprison.com ideaprison

    What kind of first question is “What type of lenses to cameras use use?”

  • Martha Benedict

    Yes, the first question was a complete mystery thanks to typos. I got it wrong of course. Only missed one other. Fun! 86.6%

  • Ken

    I disagree with your answer on #6.

  • http://ckpj.com Cameron Knight
    Author

    Hey everyone! Question #6 was poorly worded. Didn’t you hate when teachers would do that in school. I changed the wording a bit. Now you can go back and that 100%.

    What did you think of this quiz? Too hard, too easy?

    Thanks for trying it out.

    • Thinkeye

      To question #6: I still think that 50mm on full = approx 35 on 3/4 crop. If I put the 75mm on a common (3/4) sensor camera, I get approx 113mm. If I may suggest the wording according to answer:
      Which lens do I have to put on a full frame camera to get the same field of view as created by the 50mm lens on a more common frame?

  • http://orlund@orlund.com orlund

    I’m not a pro but I don’t quite get…

    #1: there is no right answer since most camera lens is made of concave and convex lens, not sure if if you would call them layers, I suppose you could call them shiny but I don’t think that’s the point. And you could even use a pinhole camera which “no lenses” would be the correct answer.

    #6: that one made since to me but it was a little hard to read.

    Interesting test though. It will make me think about it more next time I shoot.

  • Thinkeye

    Thanks for the quiz, anyway.

    • Gobu

      Ok I haven’t idea about camera

  • http://www.unbrokenhorse.com Sunira

    73.3… and I thought I was fairly knowledgeable! C- !
    :( I have some studying to do.

  • http://www.nathankendallphotography.com alterednate

    This quiz could really be helped if the questions were worded more accurately. Question #1 is completely ridiculous, I won’t even get into it. I agree about question #6, it is not clear, and needs to be reworded. However for question #8, the answer is just plain wrong, if I understand the poorly written English:

    “When the distortion of lens causes parallel lines to converge as the reach the end of the frames, what type of distortion is being caused?”

    Which I understood as “Which type of lens distortion causes parallel lines to converge at the edges of the frame?”

    Converge = “Come from different directions and meet”, meaning bent around the center of the frame.

    The answer is clearly barrel distortion. Look at http://en.wikipedia.org/wiki/Distortion_(optics)

    I don’t mean to slam the concept, because technical quizzes like this are a great way to learn (I got question #3 wrong and read up as to why…). However it should really be rewritten to make it fair and more enjoyable for everyone.

    • http://www.caronphoto.com Michael

      Agreed on the barreling, not pincushion where lines diverge.

      And I too cannot make sense of #6.

      Love the quizzes though!! Disappointed in my 73.3%…or 86.6% if I had my way :-)

  • Anik

    I failed :( Thanks Phototuts+

  • http://ckpj.com Cameron Knight
    Author

    Thanks for all the comments! This quizzes are still pretty new, and I promise they will get better.

    Alterednate – You’re right about the distortion question, and it has been fixed. I had no idea that question one would cause so much controversy. I understand now that it might be confusing, but layered and shiny seemed more humorous than anything else, and while complex lenses can contain concave elements, a convex lens is required to project images.

    Thanks again for all the feedback, and look out for more of these in the future. I’m thrilled they’re getting such a good response.

  • Ramesh Vishwakarma

    I am using SLR camera for last 4 year but I am shocked that I have not much technical knowledge about the lens. I got only 40% :(

    But from now I will try to learn my best. Thanks

  • http://www.flickr.com/photos/mkort Martijn

    Nice quiz!!!
    Good to see that I know something ;)

  • http://www.thedphoto.com Diana Eftaiha

    80% thought i was better than that but good enough i guess

  • http://www.shaneparkerphoto.com Shane Parker

    I can’t even see the quiz. Firefox 5.0.1, OSX Lion. Odd that I can see the previous quiz though.

  • Akshay Verma

    Yippie! 93.33%. Got the 3rd one wrong.

  • http://zamoht.deviantart.com Thomas Jergel

    Is question 6 based on Nikon, Sony or Pentax crop cameras?

    The example field of view used in question 6 responds to the APS-C crop standard of Nikon, Sony and Pentax, not Canon.

    Canon APS-C is 1,6x – 50mm*1,6=80mm
    Nikon, Sony and Pentax APS-C is 1,5x – 50mm*1,5=75mm

  • http://www.greenteadesign.ca Travis

    Wow I got 80% There’s no way I deserved that good of a score :P

  • http://www.ryanhoile.com Ryan

    86.67% Got the two most contentious questions wrong by the sound of it: 1 and 6. Wee bit disappointed as I aced the exposure quiz but this one was certainly tougher.

    Looking forward to more. Cheers.

  • http://vesa.me Vesa

    I got 0%.

    But that’s probably coz I selected the questions instead one of the four options below it. I just had to test if the quiz would go through.

    You shouldn’t be able to select the question.

  • http://www.tkphotography.at Boomer

    Nice test.

    But from my experiences the right answer to that question:
    Why are special solutions and clothes used for cleaning lenses?

    Is b) to make you waste money :D

    I have cleaned frontelments of lenses for years just with a t-shirt, or a simple piece of cloth.

  • Mainak

    scored 80%