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Fundamentals of Photography

Lesson 21 of 107

Quiz: Focal Length


Fundamentals of Photography

Lesson 21 of 107

Quiz: Focal Length


Lesson Info

Quiz: Focal Length

We are now gonna see if you guys have been paying attention, 'cause it is time for your first quiz of the day. So let's get the microphones to the captains, and, let's see, I think we're starting with team A, I think they're first up on the block. And so what we're gonna do is it's gonna be kind of like we did in the previous quiz. I'm gonna show you a photo, I'm gonna give you a limited selection of focal lengths that it could be, I'll give you a little bit of time to discuss it, and then you tell us what you think. So team A, here is your first photo, and we're gonna be talking about the major focal lengths that I've been talking about in the class. And start giving your captain some thoughts here. Kenna, are you playing along on your own here? I am playing along. (laughs) And I am not looking at the answers. (both laugh) Very good. Okay, do we have an answer for team A? 200 mil. And the answer is 200, very good. That was a quick answer, so one point for team A. Team B, are y...

ou ready? Your shot is right here. Just in case you're interested, this was taken in Morocco, and I think Kenna was not, Kenna took something like this too. Mm-hmm. See there. They're thinking about this. Offer some suggestions, give them some reasons why it might be one or the other. Do we have an answer for team B? We're gonna throw out 24. 24, well. Let's see what we got here. 16 is pretty close, and you know what? We're not gonna give it to the other team to choose here, you don't get a point for it, but I'm not gonna give them a chance to steal, because when you're one off, you're pretty close. 'Cause you are in the ballpark. So you're not losing a point here. Okay, so we're gonna kind of call it neutral there, but that was very good. Okay, I get to make up the rules as we go along. (class laughs) This is my class. Okay, so we're over to team A. We're at a market. Think about how would we photograph at a market, what does it look like, foreground subjects, background subjects. Alright, we're gonna need an answer. They wanna go with 35. 35. Oh, that's a good answer, because street photography, 35's a really good lens for doing that. And so as I look over to the board, I now see that we are tied up, five to five. Okay, so over to team B, a very different looking shot here. And I think we are in Istanbul, Turkey, just in case you're interested on this one. I don't know if holding fingers up to the screen helps in this case. (laughs) That's what I was just gonna ask you. Can you do it in reverse? (both laugh) We have a... an answer. Okay, good, good. (all laugh) And the answer we're going with, John, is 400. Would you like to justify or say why you think that's so? Huge amount of compression, and the sun is really big and looks close. Okay. Big sun in there, and so that is the correct answer, point for team B. Nice job, spot on. Alright, these can be a little bit tough, 'cause there's some things that are pretty close in there. I'm trying to give you just enough clues that you can probably figure it out. I don't like to make tests that are too difficult. Okay. They want 24. 24. We're gonna give you an incorrect on that one. It is a 50 millimeter lens, and what I would say is that if you look at the mountains in the background, they don't seem too small. With a 24 millimeter lens, with the boats this size, you'd probably see a smaller background. It would just kind of fade into something a little bit smaller. It's a challenging one. That is a challenging one, I will admit. Alright, let's go to New York City, here, and so I think there's been some people who've probably been to this exact spot. And so team B. What do you think we're looking at? I see some perplexed faces here. Okay. We're gonna ring in with 24. 24. And that is the right answer again. And look out, they're starting to pull ahead here. (class laughs) They are now two points into the lead, and I think we have our last photo quiz here, what focal length is this? And I think this is a good skill set for people to have, to be able to reverse engineer other photos that you like. Not saying that you like this photo, but you know. We have to use something as an example. (class members laugh) I'm very curious as to what's going on in these conversations. (all laugh) Just pick one. Alright. They're literally all giving me a different answer. (all laugh) That's why you have a captain. Makes decisions. 50. We're gonna go with 50, and incorrect answer. The correct answer is a 100 mm lens. We are starting to get some compression effects with these trees at different distances. If it was a 50 or a wide angle, you'd probably notice those back trees getting smaller and smaller. Challenging to do. But in general, you guys did a very good job there. And so I think that's good job. However, team B is pulling ahead. (laughs) About magnification versus angle of view, just because you keep using angle of view, but clearly, things are... Magnified. Yes. Right, and so we can rate the magnification of any lens, by starting with the diagonal of the sensor, so what is our normal lens? And so for most full-frame, we'd call it 43. Let's make it easy math on everyone and call it 50. Okay? So if we have a 100 mm lens, that would be considered two times magnification. When we go up to 200, it would be four times magnification. And on upwards like that. So at 24, we'd be .5 magnification, so you take your normal lens, and then what is this other lens in comparison to it, double or half, or quadruple. Alright, John, we do have a few questions online. And this is for Cheesy, what is... He's talking about, he's seeing vignetting, he or her, on the lens, 10 to 18. One side is always really dark. Why is that happening, or maybe you can just explain what vignetting is. Alright, so vignetting is a darkening of the corner. I don't like to reveal secrets, but I will reveal this one tiny secret that you may not have even noticed, is that the slides on all my classes have a slight vignetting to them. I just like the look of it. And so, the slide that you're looking at is white, but it's a little bit darker in the corner than it is in the middle. And that's the way some lenses look. Wide angle lenses, and typically very fast lenses look. And it's because when you have a wide angle lens, like this, light has to travel further when it's getting into the corners rather than in the middle, and when it travels further, it usually gets darker. And so there's a lot of lenses that have a natural vignetting to them. And it's one of the controls that we're gonna talk about in the art of editing. Because in some cases, you don't want vignetting. You want a nice, even sky tone. And other times, it's nice to add a vignetting. And so sometimes I'm adding it, and sometimes I'm taking it off. And it's more of just an optical effect that we've become quite used to. And yes, I do very specifically have a slide on that later on in the class.

Class Description

Short on time? This class is available HERE as a Fast Class, exclusively for Creator Pass subscribers.

As a photographer, you will need to master the technical basics of the camera and form an understanding of the kind of equipment you need. The Fundamentals of Digital Photography will also teach something even more important (and crucial for success) - how to bring your creative vision to fruition.

Taught by seasoned photographer John Greengo, the Fundamentals of Digital Photography places emphasis on quality visuals and experiential learning. In this course, you’ll learn:

  • How to bring together the elements of manual mode to create an evocative image: shutter speed, aperture, and image composition.
  • How to choose the right gear, and develop efficient workflow.
  • How to recognize and take advantage of beautiful natural light.

John will teach you to step back from your images and think critically about your motivations, process, and ultimate goals for your photography project. You’ll learn to analyze your vision and identify areas for growth. John will also explore the difference between the world seen by the human eye and the world seen by the camera sensor. By forming an awareness of the gap between the two, you will be able to use your equipment to its greatest potential.


  1. Class Introduction
  2. Photographic Characteristics
  3. Camera Types
  4. Viewing System
  5. Lens System
  6. Shutter System
  7. Shutter Speed Basics
  8. Shutter Speed Effects
  9. Camera & Lens Stabilization
  10. Quiz: Shutter Speeds
  11. Camera Settings Overview
  12. Drive Mode & Buffer
  13. Camera Settings - Details
  14. Sensor Size: Basics
  15. Sensor Sizes: Compared
  16. The Sensor - Pixels
  17. Sensor Size - ISO
  18. Focal Length
  19. Angle of View
  20. Practicing Angle of View
  21. Quiz: Focal Length
  22. Fisheye Lens
  23. Tilt & Shift Lens
  24. Subject Zone
  25. Lens Speed
  26. Aperture
  27. Depth of Field (DOF)
  28. Quiz: Apertures
  29. Lens Quality
  30. Light Meter Basics
  31. Histogram
  32. Quiz: Histogram
  33. Dynamic Range
  34. Exposure Modes
  35. Sunny 16 Rule
  36. Exposure Bracketing
  37. Exposure Values
  38. Quiz: Exposure
  39. Focusing Basics
  40. Auto Focus (AF)
  41. Focus Points
  42. Focus Tracking
  43. Focusing Q&A
  44. Manual Focus
  45. Digital Focus Assistance
  46. Shutter Speeds & Depth of Field (DOF)
  47. Quiz: Depth of Field
  48. DOF Preview & Focusing Screens
  49. Lens Sharpness
  50. Camera Movement
  51. Advanced Techniques
  52. Quiz: Hyperfocal Distance
  53. Auto Focus Calibration
  54. Focus Stacking
  55. Quiz: Focus Problems
  56. Camera Accessories
  57. Lens Accessories
  58. Lens Adaptors & Cleaning
  59. Macro
  60. Flash & Lighting
  61. Tripods
  62. Cases
  63. Being a Photographer
  64. Natural Light: Direct Sunlight
  65. Natural Light: Indirect Sunlight
  66. Natural Light: Mixed
  67. Twilight: Sunrise & Sunset Light
  68. Cloud & Color Pop: Sunrise & Sunset Light
  69. Silhouette & Starburst: Sunrise & Sunset Light
  70. Golden Hour: Sunrise & Sunset Light
  71. Quiz: Lighting
  72. Light Management
  73. Flash Fundamentals
  74. Speedlights
  75. Built-In & Add-On Flash
  76. Off-Camera Flash
  77. Off-Camera Flash For Portraits
  78. Advanced Flash Techniques
  79. Editing Assessments & Goals
  80. Editing Set-Up
  81. Importing Images
  82. Organizing Your Images
  83. Culling Images
  84. Categories of Development
  85. Adjusting Exposure
  86. Remove Distractions
  87. Cropping Your Images
  88. Composition Basics
  89. Point of View
  90. Angle of View
  91. Subject Placement
  92. Framing Your Shot
  93. Foreground & Background & Scale
  94. Rule of Odds
  95. Bad Composition
  96. Multi-Shot Techniques
  97. Pixel Shift, Time Lapse, Selective Cloning & Noise Reduction
  98. Human Vision vs The Camera
  99. Visual Perception
  100. Quiz: Visual Balance
  101. Visual Drama
  102. Elements of Design
  103. Texture & Negative Space
  104. Black & White & Color
  105. The Photographic Process
  106. Working the Shot
  107. What Makes a Great Photograph?


a Creativelive Student

Love love all John Greengo classes! Wish to have had him decades ago with this info, but no internet then!! John is the greatest photography teacher I have seen out there, and I watch a lot of Creative Live classes and folks on YouTube too. John is so detailed and there are a ton of ah ha moments for me and I know lots of others. I think I own 4 John Greengo classes so far and want to add this one and Travel Photography!! I just drop everything to watch John on Creative Live. I wish sometime soon he would teach a Lightroom class and his knowledge on photography post editing.!!! That would probably take a LOT OF TIME but I know John would explain it soooooo good, like he does all his Photography classes!! Thank you Creative Live for having such a wonderful instructor with John Greengo!! Make more classes John, for just love them and soak it up! There is soooo much to learn and sometimes just so overwhelming. Is there anyway you might do a Motivation class!!?? Like do this button for this day, and try this technique for a week, or post this subject for this week, etc. Motivation and inspiration, and playing around with what you teach, needed so much and would be so fun.!! Just saying??? Awaiting gadgets class now, while waiting for lunch break to be over. All the filters and gadgets, oh my. Thank you thank you for all you teach John, You are truly a wonderful wonderful instructor and I would highly recommend folks listening and buying your classes.


I don't think that adjectives like beautiful, fantastic or excellent can describe the course and classes with John Greengo well enough. I've just bought my first camera and I am a total amateur but I fell in love with photography while watching the classes with John. It is fun, clear, understandable, entertaining, informative and and and. He is not only a fabulous photographer but a great teacher as well. Easy to follow, clear explanations and fantastic visuals. The only disadvantage I can list here that he is sooooo good that keeps me from going out to shoot as I am just glued to the screen. :-) Don't miss it and well worth the money invested! Thank you John!


Dear John, thanks for this outstanding classes. You are not only a great photographer and instructor, but your classes are pleasant, they are not boring, with a good sense of humor, they go straight to the point and have a good time listening to you. Please, keep teaching what you like most, and I will continue to look for your classes. And thanks for using a plain English, that it's important for people who has another language as native language. Thanks again, Juan