Canon® Lenses: The Complete Guide

Lesson 20 of 58

Canon® Lens Composition

 

Canon® Lenses: The Complete Guide

Lesson 20 of 58

Canon® Lens Composition

 

Lesson Info

Canon® Lens Composition

So beyond kind of the standard glass cannon developed ultra low dispersion glass and so dispersion is when light hits a lands and it disperses it goes off somewhere else and we don't like that because we're losing that light source okay so they designed ud glass to correct for this chromatic aberration of light hitting glass and kind of taking off doing its own thing and so there's a full list of lenses and for those of you by the class and get the pdf you don't have to write all these numbers down you go back and you can just look at this slide number and you can pull up the whole list of these air lenses that have ud glass and one of the things I really want to make sure is getting this list right current and up to date of which ones have all this in here so this is a significant improvement over normal glass because image quality less chromatic aberration less dispersion of the glass as we shooting images improved contrast improve sharpness because of this type of glass that is in t...

here and there's a type of class we're going to talk about next called fluoride and this is a much cheaper glass to use in that so it's a relatively affordable way of improving the quality of the glass of our lenses now this is originally called you d and they have since made subsequent improvements to it and they now call it super ud glass, and so if you see super ut that's this higher in type glass, but then along came fluoride. All right, so fluoride is a rare earth element, and it isn't any fairly elite collection of lenses that you'll see listed here on the left of your screen and fluoride is a rather interesting element is that you're going to get pretty much no chromatic aberration at all. If you use it, excellent let's put in and all of our lenses. One fluoride element has the power of to you, d elements. Awesome. We just saved money and wait. By reducing the number of elements in our lands. 00:02:00.32 --> 00:02:02. We're gonna make our lands smaller now, because we're 00:02:02.12 --> 00:02:05. using these fluoride elements. This is great news, 00:02:05.11 --> 00:02:06. love to hear about this new technology. Very low refractive index so refract ok what is refract reflect and we all know what reflect is we see our reflection in a mere light bounces off of a surface okay when you react to something what happens along something happens okay react to that all right so when light hits glass dispersion refraction it takes off and into a different direction very low refractive index which means the light is going where it's supposed to go very low dispersion this is all sounding really good here's a problem natural fluoride is too small for photographic lenses so when you find natural fluoride I don't know what exactly looks like but it's too small to just grind it and put it in a lance it'll work out for certain types of small microscopes but it's not big enough toe work put in a regular lands so kanan grows their own synthetic flow right crystals that they put in their lenses so in case you're wondering why is this two hundred to four hundred lands costs ten thousand dollars because they're growing gloria class crystals to put in your leads how long does that take? I don't know but it can take quite some time I know there are certain lenses that take more than eighteen months from the beginning of the lens curing process and so sometimes they're working on these lens elements and therein bats and heating up and cooling down going through cycles for weeks at a time. And it takes four times longer to grind a flow right element than it does a u, d or a standard glass element. They're very fragile, and they could be broken. And so they have to be able to be mounted in very strong lenses so that they don't get moved in the wrong way. 00:04:02.44 --> 00:04:06. And so imagine if you're breaking four times the amount 00:04:06.19 --> 00:04:07. of glass every time you're trying to grind it, that's 00:04:07.93 --> 00:04:10. going increase. The cost of that lends quite a bit. 00:04:10.63 --> 00:04:13. And so the lenses, as I say, this is a pretty lofty 00:04:13.87 --> 00:04:17. line of lenses that are using these fluoride elements. 00:04:17.47 --> 00:04:20. But you'll see it listed as one of the elements that 00:04:20.04 --> 00:04:21. is part of that lens design.

Class Description


Working with interchangeable lenses can be both exciting and daunting to all levels of photographers. Canon® Lenses: The Complete Guide with John Greengo will prepare you to select the right lens and get the most out of all of your lens investments.

John Greengo is the master of making complex photography concepts easy to understand and in this class, he’ll bring all of your Canon® EOS DSLR lens options and operations into focus. You’ll learn about: 

  • Focal length and aperture
  • Canon® zoom lenses
  • Which lens accessories to buy
  • Third-party lenses
  • Maintaining a lens system
John will cover the full range of Canon® lenses, from ultra-wide to super-telephoto, zooms to primes, fisheye to perspective control. You’ll learn how to match the right lens to your needs and get insights on the best ways to use it.

Whether you are thinking about buying a new lens or just want to get the most out of what you already have, Canon® Lenses: The Complete Guide with John Greengo will help you out.

Lessons

  1. Class Introduction
  2. Canon® Lens Basics

    John Greengo gets you up-to-speed on the basics of working with interchangeable Canon® lenses.

  3. Focal Length: Angle of View
  4. Focal Length: Normal Lenses
  5. Focal Length: Wide Angle Lenses
  6. Focal Length: Telephoto Lens
  7. Focal Length Rule of Thumb
  8. Field of View
  9. Aperture Basics
  10. Aperture: Maximum Aperture
  11. Aperture: Equivalent Focal Length
  12. Aperture: Depth of Field
  13. Aperture: Maximum Sharpness
  14. Aperture: Starburst Effect
  15. Aperture: Flare
  16. Aperture: Hyperfocal Distance
  17. Camera Mount System
  18. Canon® Lens Compatibility
  19. Canon® Lens Design
  20. Canon® Lens Composition
  21. Canon® Lens Shape
  22. Canon® Lens Coating
  23. Canon® Lens Focusing
  24. Lens Autofocus
  25. Canon® Lens Image Stabilization
  26. Canon® L Lenses
  27. Image Quality
  28. Canon® Zoom Lenses: Standard
  29. Canon® Super Zooms
  30. Canon® Wide Zooms
  31. Canon® Telephoto Zooms
  32. Prime Lens: Normal Lenses
  33. Prime Lens: Moderate Wide
  34. Prime Lens: Wide Angle
  35. Prime Lens: Ultra-Wide
  36. Prime Lens: Short Telephoto
  37. Prime Lens: Medium Telephoto
  38. Prime Lens: Super Telephoto
  39. 3rd Party Lenses Overview
  40. 3rd Party Prime Lenses
  41. 3rd Party Zoom Lenses
  42. Lens Accessories: Filters
  43. Lens Accessories: Lens Hoods
  44. Lens Accessories: Tripod Mount
  45. Lens Accessories: Extension Tubes
  46. Lens Accessories: Extenders
  47. Macro Lens: Reproduction Ratio
  48. Macro Lens: Technique and Choices
  49. Fisheye: Technique and Choices
  50. Tilt Shift: Techniques and Choices
  51. Make a Lens System Choice
  52. Choosing A Portrait Lens
  53. Choosing A Sports Lens
  54. Choosing A Landscape Lens
  55. Best Lenses for You
  56. Lens Maintenance
  57. Buying and Selling Lens
  58. What is John Greengo's Favorite Lens?

Reviews