Foundations of Photography: Specialty Lenses
Illustration by Petra Stefankova

Deepening depth of field


From:

Foundations of Photography: Specialty Lenses

with Ben Long

Video: Deepening depth of field

In the last movie, you saw how you can use a tilt-shift lens to greatly decrease depth of field. We used it to create a toy effect. You can also use it for more practical things. You can use it for throwing backgrounds out very easily, to create really shallow depth of field effects. We're going to do the opposite here. We're going to use it to expand the depth of field. Now, you can't use it to expand depth of field in just any situation, but you can in a situation like this, where your camera is at an angle to your focal plane. So take a look at what we have got here.
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  1. 4m 10s
    1. Welcome
      1m 46s
    2. Roadmap of the course
      2m 24s
  2. 3m 53s
    1. Words about focal length
      2m 6s
    2. Understanding camera position
      1m 47s
  3. 39m 19s
    1. What filters are for
      2m 37s
    2. Shopping for filters
      3m 55s
    3. Understanding neutral density filters
      4m 53s
    4. Applying neutral density filters
      3m 55s
    5. Polarizing filters
      3m 4s
    6. Some shooting tips for working with a polarizing filter
      2m 32s
    7. Using infrared filters
      9m 15s
    8. Processing the infrared image
      6m 7s
    9. Handling stuck filters
      3m 1s
  4. 38m 37s
    1. Working with ultra-wide lenses
      7m 19s
    2. Using a wide-angle lens
      4m 43s
    3. Understanding fisheye lenses
      4m 2s
    4. Working with fisheye lenses
      3m 59s
    5. Understanding fisheye exposure
      3m 3s
    6. Taking fisheye further
      4m 16s
    7. Processing fisheye and wide-angle images
      7m 38s
    8. Correcting tone in fisheye images
      3m 37s
  5. 35m 37s
    1. Understanding super telephoto
      6m 21s
    2. Shooting distant subjects
      8m 26s
    3. Compressing the sense of depth
      7m 53s
    4. Working with shallow depth of field
      5m 35s
    5. Working with teleconverters
      2m 38s
    6. Editing telephoto images
      4m 44s
  6. 16m 47s
    1. Understanding macro basics
      2m 47s
    2. Shooting close
      4m 52s
    3. Shooting macro
      5m 20s
    4. Working with a point-and-shoot for macro
      1m 58s
    5. Using a two-lens strategy
      1m 50s
  7. 16m 39s
    1. Understanding tilt shift
      3m 37s
    2. Correcting perspective
      4m 29s
    3. Creating the toy effect
      4m 41s
    4. Deepening depth of field
      3m 52s
  8. 32m 39s
    1. Working with specialty lenses
      2m 43s
    2. Using the Lensbaby
      9m 13s
    3. Working with the Lensbaby Macro attachment
      3m 50s
    4. Shooting with a Holga attachment
      3m 4s
    5. Using an alternative mount lens
      2m 18s
    6. Using super-fast lenses
      1m 47s
    7. Correcting Lensbaby images
      9m 44s
  9. 39m 48s
    1. Correcting perspective
      10m 41s
    2. Creating the toy effect
      6m 31s
    3. Getting the lo-fi Holga look
      11m 17s
    4. Reproducing the effect of a Lensbaby
      8m 17s
    5. Cropping and enlarging images
      3m 2s
  10. 2m 47s
    1. Choosing whether to borrow or buy
      2m 0s
    2. Goodbye
      47s

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Watch the Online Video Course Foundations of Photography: Specialty Lenses
3h 50m Intermediate Dec 17, 2012

Viewers: in countries Watching now:

Join photographer, author, and teacher Ben Long on location in San Francisco as he explores the creative options provided by the kinds of lenses and lens accessories that don't always make it into most camera bags.

The course begins with a look at several common and inexpensive lens attachments, from polarizers to neutral density filters. The course then explores ultra-wide angle and fisheye lenses as well as ultra-long telephoto and macro lenses. The course concludes with a look at tilt-shift lenses, which are useful for architectural photography and special effects, and at offbeat lenses, such as Lensbaby and Holga attachments.

The course also contains Photoshop postproduction advice and examples that illustrate the creative possibilities that an expanded lens collection provides. And because some specialty lenses are extremely expensive, the course also contains advice on renting gear.

Subject:
Photography
Software:
Photoshop
Author:
Ben Long

Deepening depth of field

In the last movie, you saw how you can use a tilt-shift lens to greatly decrease depth of field. We used it to create a toy effect. You can also use it for more practical things. You can use it for throwing backgrounds out very easily, to create really shallow depth of field effects. We're going to do the opposite here. We're going to use it to expand the depth of field. Now, you can't use it to expand depth of field in just any situation, but you can in a situation like this, where your camera is at an angle to your focal plane. So take a look at what we have got here.

If I look through my camera, I see that I have these two lenses. This lens up here is out of focus and so is that one. So I'm going to start by focusing my lens here, and I'm going to focus on this frontmost lens. So, again, this is a tilt-shift lens, so it's manual. So I'm just working until that's in focus. It looks like it is. Now, look at the lens in the background, the long telephoto lens. It's still out of focus. I could possibly try to get it in focus through a depth of field--through an aperture change to get more depth of field, but it's awfully dark in here, and it's actually going to be easier to do this with a simple tilt.

So as you saw in--when we were reducing depth of field, if I tilt this way, I can make depth of field more shallow and now that far lens is going even further out of whack. If I go to the other way though, just a tiny, little adjustment, I can bring that far lens into focus. Now if you look at the front lens, it's still in focus as well, so I've got this tremendous depth of field here. Now, I have made slight changes to the proportions of the image. Let me go back to where we were before.

You can see that there is a little bit of stretching going on, but I don't feel like it's egregious. It's not really changing the shape of the objects. It's not changing the relationships of the objects too much. It is changing some of the composition. Look at how far the upper lens is from the top of the frame here and when I correct the depth of field, it's moving closer to the top of the frame. Now, in this case, obviously this is just a kind of a dumb experimental setup so composition isn't that critical. But if it really was, if I wanted to keep it as far from the top of the frame as it was before, then I could just employ a shift.

I can now use my shift control there to bring it back down and now I've got the composition that I had before, with deeper depth of field. There's been a little bit of perspective change, but I'm not worried about that. I like this extra focus that I've got. Now, this doesn't work if I am pointing the camera at an object and I've got another object behind it. In other words, if I'm perpendicular to the focal plane, I can't expand depth of field. So I can't have someone up here at a distant object and manage to get them both into focus. This is, again, for times when you have got your camera at an angle to your plane of focus.

So obviously, it's great for shooting a couple of lens on a tabletop and I understand that that might not be something that you do that often. But you might be a landscape shooter. You might actually often stand on a tremendously broad plane with your camera angled a little bit down. Sometimes with a tilt-shift lens in that situation, you are going to be able to get deeper depth of field than you would be able to with a simple aperture change, particularly if your aperture change requires you to go down to an aperture like 16 or higher, which would result in your overall image being sharpened because of diffraction artifacts.

So it's a trade-off. This is a heavy lens to carry. Another thing about sharpness in a landscape photo is you definitely want the foreground sharp because that's going to be large in your print. If your distant background is a little soft, you may not be able to see it. So sometimes sharpness in a landscape photo isn't as critical or super-deep depth of field isn't as critical as you think it is. If it is for you though, and if you know it is, if you know your printing is going to require it, then a tilt-shift lens is probably a better way to go to get that super-deep depth of field than just relying on a really small aperture.

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