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Canon Lens Composition

Lesson 20 from: Canon Lenses: The Complete Guide

John Greengo

Canon Lens Composition

Lesson 20 from: Canon Lenses: The Complete Guide

John Greengo

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Lesson Info

20. Canon Lens Composition

Next Lesson: Canon Lens Shape

Lessons

Class Trailer
1

Class Introduction

07:11
2

Canon Lens Basics

14:12
3

Focal Length: Angle of View

11:31
4

Focal Length: Normal Lenses

09:43
5

Focal Length: Wide Angle Lenses

18:15
6

Focal Length: Telephoto Lens

21:27
7

Focal Length Rule of Thumb

15:36
8

Field of View

10:14
9

Aperture Basics

04:41
10

Aperture: Maximum Aperture

18:44
11

Aperture: Equivalent Focal Length

07:48
12

Aperture: Depth of Field

06:23
13

Aperture: Maximum Sharpness

08:33
14

Aperture: Starburst Effect

05:18
15

Aperture: Flare

06:48
16

Aperture: Hyperfocal Distance

19:32
17

Camera Mount System

14:57
18

Canon Lens Compatibility

14:26
19

Canon Lens Design

12:29
20

Canon Lens Composition

04:30
21

Canon Lens Shape

05:50
22

Canon Lens Coating

06:53
23

Canon Lens Focusing

14:10
24

Lens Autofocus

08:17
25

Canon Lens Image Stabilization

06:57
26

Canon L Lenses

10:18
27

Image Quality

09:46
28

Canon Zoom Lenses: Standard

17:50
29

Canon Super Zooms

05:20
30

Canon Wide Zooms

09:48
31

Canon Telephoto Zooms

16:09
32

Prime Lens: Normal Lenses

09:19
33

Prime Lens: Moderate Wide

07:01
34

Prime Lens: Wide Angle

05:33
35

Prime Lens: Ultra-Wide

09:23
36

Prime Lens: Short Telephoto

09:03
37

Prime Lens: Medium Telephoto

08:59
38

Prime Lens: Super Telephoto

13:59
39

3rd Party Lenses Overview

06:01
40

3rd Party Prime Lenses

15:25
41

3rd Party Zoom Lenses

26:28
42

Lens Accessories: Filters

33:42
43

Lens Accessories: Lens Hoods

09:58
44

Lens Accessories: Tripod Mount

04:51
45

Lens Accessories: Extension Tubes

04:30
46

Lens Accessories: Extenders

13:11
47

Macro Lens: Reproduction Ratio

18:59
48

Macro Lens: Technique and Choices

25:59
49

Fisheye: Technique and Choices

18:49
50

Tilt Shift: Techniques and Choices

27:08
51

Make a Lens System Choice

05:37
52

Choosing A Portrait Lens

17:21
53

Choosing A Sports Lens

17:31
54

Choosing A Landscape Lens

10:39
55

Best Lenses for You

08:46
56

Lens Maintenance

11:19
57

Buying and Selling Lens

11:15
58

What is John Greengo's Favorite Lens?

08:37

Lesson Info

Canon Lens Composition

so beyond kind of the standard glass can and developed ultra low dispersion glass. And so dispersion is when light hits a lens 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 who 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 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, improved sharpness because of this type of gla...

ss that is in there 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 You d class. And so, if you see super you d that's this higher in type glass. But then along came fluoride. Alright, So fluoride is a rare earth element and it isn't in a 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 know chromatic aberration at all if you use it Excellent. Let's put in 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, we're gonna make our land smaller now because we're using these fluoride elements. This is great news. Love to hear about this new technology. Very low refractive index, so refract Okay, what is refract reflect and we all know what reflect ISS. We see our reflection in a mere light bounces off of a surface. Okay, When you react to something, what happens, move along. Something happens. Okay, React to that. All right, So when light hits glass dispersion refraction, it takes often 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 floor, I I don't know what exactly looks like, but it's too small to just grind it and put it in a lance. It will work out for certain types of small microscopes, but it's not big enough toe work put in a regular lens. So Canon grows their own synthetic fluoride crystals that they put in their lenses. So in case you're wondering, why does this 200 to 400 lens cost $10,000 because they're growing Gloria class crystals to put in your lands? 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 18 months from the beginning of the lens curing process. And so sometimes they're working on these lens elements, and they're in bats and heating up and cooling down, going through cycles for weeks at a time. And it takes four times longer to grind a fluoride 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. And so imagine if you're breaking four times the amount of glass every time you're trying to grind it. That's gonna increase the cost of that lens quite a bit. And so the lenses, as I say, this is a pretty lofty line of lenses that are using these fluoride elements, but you will see it listed as one of the elements that is part of that lens design

Class Materials

Bonus Materials with Purchase

What's in the Frame? HD
What's in the Frame? LOW
Field of View HD
Field of View LOW
Lens Keynote Parts 1-4
Lens Keynote Parts 5-8
Canon® Lens Data

Ratings and Reviews

user-b3a96c
 

I so appreciate what a good teacher John is. I wish I would have known this much about lenses when I first started out buying my lenses. It was hard finding information about lenses. I didn't want to spend money on a lens I wouldn't use. The better understanding we have about our gear the better photographers we will be. I have never seen a class like this. Invaluable...yes I bought the class! I am really impressed with the high quality photography classes available on Creative Live!

a Creativelive Student
 

Have loved the other John Greengo classes I've watched & purchased - and this is another winner! Having been a high school/college science teacher, it is refreshing to take a course with someone who not only is extremely experienced, seems to be a computer having stored so much knowledge, but is equally concerned about making the information truly understandable to different levels. And he shares the information using every tool he can: slides, video, interactive presentations, and great quizzes. I learned so much about my Canon lenses - and lenses in general with their many components. I am excited about testing each of mine to see what macro ratio they handle, and especially appreciated the tutorial on testing each for their specific quirk that affects super sharpness. This class is great whether you own Canon lenses or not. Thanks John Greengo!

Abbeylynne
 

This was a great class not just about the lenses that Canon offers but also how each lens works. As usual, John's slides are alway informative and entertaining. There is a phrase: John has a slide for that! I am not even a Canon user and found this class to have great information for the use of each specific lens. Great work John! Thank you Creative Live for another great class!

Student Work

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