Fundamentals of Photography

Lesson 53 of 107

Auto Focus Calibration

 

Fundamentals of Photography

Lesson 53 of 107

Auto Focus Calibration

 

Lesson Info

Auto Focus Calibration

The next little bit is exclusively for some special people, Nikon and Canon owners, Pentax, too. Anybody who uses a DSLR has a phase detection focusing system in their camera and I told you about the slight error that can happen and this is how you correct for that error. And, cameras are supposed to focus on a subject and be perfectly on. With mirrorless cameras, because they're grabbing the information from the sensor, it's actually accurate all the time. And so, it knows when it's got it. But, for an SLR, it's an estimation and sometimes it's a little wrong and it focuses consistently off because there's something off in the calibration. And, it could front focus, it could back focus, as well. And, I know that there are some people out there that would just say (stomp) it shouldn't to that. I spent a lot of money. And that's true, but we are dealing about physical stuff that needs to be manufactured and there are certain tolerances. If you want perfect focus, we could probably do it...

and it would be a $100,000 lens. And, it's just, you know, we would rather have a lens that focuses 99.9% of the time for $1,000. And, so, things are gonna get off when there's mechanical parts and moving parts and there's manufacturing tolerances. And, sometimes, what happens is a camera will hit plus or minus 1% and then, the lens will hit plus or minus 1% and then the two of them will probably be zero but, it could be plus two or it could be minus two and that's when things kind of get thrown off. And, so, in the past, we had to send all of our gear back to the manufacturer and then, they would do something with it and then we get our gear back and now, they allow it, us to fix it ourselves. And, so, if you wanna fix it yourself, you have to test it to see exactly what's wrong with it. And, it needs to be a consistent problem. If you're having a situation where it focuses in front, in back, everything's out of focus but, it's different every time, okay, that's something else. It's where, you know, I'm focusing on the eyes and the nose is in focus on a consistent basis with the same lens all the time. That's the type of problem we can solve here. What you need to do is you need to focus on a subject and you can use a focusing target, a book, or pretty much anything else you want. But, we need to measure if we're actually focusing front or behind it. So, it can't just be a flat object. You can buy a test chart that looks like this or you can make your own which is what I do with rulers and yardsticks. It's pretty easy to do. And, you just gotta line em up and set em up. And, so, I'm gonna focus on the vertical one and I'm gonna measure whether I'm in front or in back. And, so, when you get into the calibration of these cameras, you'll be able to adjust the focus forward or back by one increment. I don't know what one increment is but, it's a really small amount. And, so, this is what my photos would look like. So, I'm adjusting it by minus 20 and plus 20 on the extremes and the yellow arrows indicate where I thought the best focus was. And, so, my camera set at zero is front focusing ever so slightly. So, I would probably set my camera to plus three or maybe plus four, something in that range there. Now, this is something that is not gonna be a major problem for most people most of the time. It's for people who have longer telephoto lenses, people who have very fast lenses who shoot at shallow depth of field on a regular basis. And, so, you're gonna need everything that you would use to get really sharp photos. You're gonna wanna have your tripod, cable release, self timer, things like that set up. You're gonna need to set your camera up to shoot the highest quality images possible at the shallowest depth of field possible and there's a couple different ways that you can do that but, you wanna shoot as shallow depth of field as possible. And, then, what you're gonna do is I unfocus the lens, I let it auto focus, and then I have it take the picture. Now, kind of the one additional step that I'll do is I'll do a couple of photos at each setting. I'll unfocus, take a picture, unfocus, take a picture, and, then, if I really wanna be precise, I unfocus the other direction, so that it has to achieve focus from both directions. I want it to be able to find the right spot from both sides and I'm trying to look for things that are consistent. If it's out of focus every time, then I'm gonna make an adjustment and I'll go forward and back. Now, yeah, I'm kind of a picky guy, and I have some fast lenses so, I like to be right. So, I have to, I hate buying new cameras because I gotta go do the calibration on all my lenses, and I gotta lot of lenses, and I gotta get it all right. And, for the most part, I am adjusting almost all of my lenses a few point forward or back. And, so, if you have lenses that are faster than 2. those are the people that are really gonna need to do it. So, this is for, typically it's Nikon and Canon, anyone who has fast glass and I'm talking about apertures of 2.8 or faster. Talking about telephoto lenses, macro lenses, and portrait lenses, those are the people that are gonna get the most benefit and see some change in it. If it's something erratic, then, you're gonna need to send your camera back to the manufacturer because there's something else going wrong. It's consistent problems that we can fix here.

Class Description

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.

Lessons

  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?

Reviews

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.

Eve
 

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!

Vlad Chiriacescu
 

Wow! John is THE best teacher I have ever had the pleasure of learning from, and this is the most comprehensive, eloquent and fun course I have ever taken (online or off). If you're even / / interested in photography, take this course as soon as possible! You might find out that taking great photos requires much more work than you're willing to invest, or you might get so excited learning from John that you'll start taking your camera with you EVERYWHERE. At the very least, you'll learn the fundamental inner workings and techniques that WILL help you get a better photo. Worried about the cost? Well, I've taken courses that are twice as expensive that offer less than maybe a tenth of the value. You'll be much better off investing in this course than a new camera or a new lens. I cannot reccomend John and this course enough!