Depth of Field Test

Depth of Field Test

The first part tests your knowledge of the basic principles of depth-of-field while the second part tests your ability to accurately guess the amount of depth-of-field with a real-world situation.This test is divided into two parts.

Best of luck!

Basic Principles

• 1. Which camera or lens setting has no effect on depth-of-field?

  •  T-Stop
  •  ISO
  •  Focal Length
  •  Format

• 2. When a point in the subject or scene registers also as a point on film or video, it is referred to as being __________.

  •  Within the zone
  •  Within the frame
  •  Inside the circle of confusion
  •  In critical focus

• 3. True or false: the size of the finished film or video image (projected, TV, Internet) has an effect on acceptable focus?

  •  True
  •  False

• 4. What is the approximate ratio of depth-of-field in front of and behind a subject you are focused on?

  •  1/3 in front; 2/3 behind
  •  1/2 in front; 1/2 behind
  •  2/3 in front; 1/3 behind
  •  3/4 in front; 1/4 behind

• 5. What is the closest distance at which the far limit of depth-of-field extends to infinity called?

  •  Superfocal Distance
  •  Infinity Range
  •  Critical Focus
  •  Hyperfocal Distance

• 6. Stopping down the lens __________ depth-of-field.

  •  Increases
  •  Decreases
  •  Has no effect on

• 7. Opening up the iris of a lens __________ depth-of-field.

  •  Increases
  •  Decreases
  •  Has no effect on

• 8. Getting closer to the subject you’re focusing on __________ depth-of-field.

  •  Increases
  •  Decreases
  •  Has no effect on

• 9. Adding a filter in front of the lens without adjusting the exposure __________ depth-of-field.

  •  Increases
  •  Decreases
  •  Has no effect on

• 10. Using a 35mm film camera as opposed to a 16mm film camera for the exact same shot would cause depth-of-field to __________.

  •  Increase
  •  Decrease
  •  Stay the same

Guess the Depth-of-Field

In this section, you are given a situation and must guess the depth-of-field you have. You may assume that the camera is shooting 24 frames-per-second with a 180-degree shutter.

• 11. How much depth-of-field do you have with the settings below?

  
  •  1/2 in. (Half-an-inch)
  •  2 in. (Two inches)
  •  6 in. (Six inches)
  •  15 in. (Fifteen inches)

• 12. How much depth-of-field do you have with the settings below?

  
  •  1 ft. (One foot)
  •  3 ft. (Three feet)
  •  6 ft. (Six feet)
  •  10 ft. (Ten feet)

• 13. How much depth-of-field do you have with the settings below?

  
  •  2 ft. 10 in. (Two feet and ten inches)
  •  6 ft. 3 in. (Six feet and three inches)
  •  10 ft. (Ten feet)
  •  20 ft. (Twenty feet)

• 14. How much depth-of-field do you have with the settings below?

  
  •  1 in. (One inch)
  •  3 in. (Three inches)
  •  9 in. (Nine inches)
  •  12 ft. (Twelve feet)

• 15. How much depth-of-field do you have with the settings below?

  
  •  5 ft. 6 in. (Five feet and six inches)
  •  13 ft. 6 in. (Thirteen feet and six inches)
  •  50 ft. 3 in. (Fifty feet and three inches)
  •  Infinity

• 16. How much depth-of-field do you have with the settings below?

  
  •  2 in. (Two inches)
  •  10 in. (Ten inches)
  •  20 in. (Twenty inches)
  •  4 ft. (Four feet)

• 17. How much depth-of-field do you have with the settings below?

  
  •  10 ft. 2 in. (Ten feet and two inches)
  •  28 ft. 9 in. (Twenty-eight feet and nine inches)
  •  68 ft. 6 in. (Sixty-eight feet and six inches)
  •  Infinity

• 18. How much depth-of-field do you have with the settings below?

  
  •  12 ft. 6 in. (Twelve feet and six inches)
  •  13 ft. (Thirteen feet)
  •  13 ft. 6 in. (Thirteen feet and six inches)
  •  14 ft. (Fourteen feet)

• 19. How much depth-of-field do you have with the settings below?

  
  •  4 in. (Six inches)
  •  4 ft. (Four feet)
  •  14 ft. (Fourteen feet)
  •  40 ft. (Forty feet)

• 20. How much depth-of-field do you have with the settings below?

  
  •  8 ft. 8 in. (Eight feet and eight inches)
  •  18 ft. 8 in. (Eighteen feet and eight inches)
  •  88 ft. 8 in. (Eighty-eight feet and eight inches)
  •  Infinity

Think You Understand Depth of Field? Take the Black and Blue DOF Test to Find Out

Joe Marine

06.4.12 @ 1:29PM Tags : cinematography, depthoffield, dof

Here’s a little bit from Evan on the test:

So you just started using DSLRs and you think you’ve got an idea and you think you’ve got an idea about this newfangled “depth of field.” Or maybe you’re an experienced professional AC and you know the depth of field chart by heart for a 40mm Master Prime. Regardless of your experience level, depth of field is an extremely important concept to wrap your head around if you want to shoot with large sensor cameras (like those DSLRs you might be using DSLRs you might be using). Camera Assistant Evan Luzi over at The Black and Blue The Black and Blue has created a quiz with 20 questions to test quiz with 20 questions to test your depth of field knowledge.

Do you know what depth of field is? Are you able to calculate it with just the power of your mind?

Well, it’s time to put you to the test.

I’ve prepared a 20-question Depth of Field Quiz that’ll scrutinize your knowledge of the basic principles of DOF and your ability to accurately guess the amount of depth of field in camera setups.

It’s not easy — but I have a feeling you’re up to the challenge, so give it a shot:

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Depth of field is an essential concept to understand in filmmaking — because if you want people to watch your film, it has to be in focus. Understanding how f-stops, sensor sizes, and distances affect the amount of your frame that is in acceptable focus is an important skill. The artistic choices that can result from expert knowledge of depth of field can enhance the effect that a shot has on the viewer. It’s very common to see super-shallow depth of field in videos online, but razor-thin depth of field is an artistic tool (and a possible by-product of no light and large sensors) like any other that can be used to your advantage. One of the better uses of the shallow depth of field caused by the gigantic sensor in the Canon 5D Mark II (same sensor size as the Canon 5D Mark III) was the season 6 finale of the television show House M.D., which used the depth of field to enhance the emotion in certain scenes.

On the other hand, deep depth of field — even though it has fallen out of fashion thanks to large sensor digital camera — is expertly used in the Orsen Welles film Citizen Kane. While that is the most famous example, there are plenty of films over the years that have utilized greater depth to their advantage. If you would like to see more examples of shallow depth of field used in a professional setting, the DPs of the Starz series Boss with Kelsey Grammer — which happens to be shot on the Arri Alexa — work almost exclusively at T1.3 or T2 with Arri/Zeiss Master Primes.

Does anyone have examples of movies or shows that utilize shallow or deep depth of field to their advantage? If so, feel free share them below in the comments.

7D support Current status

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Current status

7D under development

Added by Autopilot

Support for the Canon EOS 7D is almost frozen, having a running version of Magic Lantern might never happen.

Thanks to an anonymous donor we have a test 7D body and can produce a firmware dump from it.

The problem is handling the 2 instances of DryOS, one for each Digic. Currently we can generate signed firmware images and we have dumped the 7D's ROM for analysis, but we do not know how to hijack task execution on the Master/Slave (2 headed) DryOS instances. We are only able to produce a dumper and some debug functions. See See 7D_internals, 7d_intercom

• Apply this bspatch to the 7D 1.1.0 firmware (instructions and details) to generate a dumper firmware with md5sum f9d720f38c7991f9526d4b34e21c7d7c. Follow the normal "Update Firmware" procedure to write out a ROM0.bin file with the memory starting at0xFF00_0000. The entry point is at 0xFF01_0000.

• See 7d 1.2.3 dumper 
• we can produce a dumper for 1.2.5 if needed.

Available firmwaresEdit

• EOS 7D fw 1.0.9 (19 Oct 2009)
• EOS 7D fw 1.1.0 (5 Nov 2009)
• EOS 7D fw 1.2.1 (15 Apr 2010)
• EOS 7D fw 1.2.3 (25 Nov 2010)
• EOS 7D fw 1.2.5 (26 Apr 2011)

http://www.canonrumors.com/2011/04/firmware-1-2-5-for-eos-7d

http://web.canon.jp/imaging/eosd/firm-e/eos7d/firmware.html

Downgrade from the last two versions available only through EOS Utility!

What we know:

• Device ID 0x8000250
• USB ID 0x319a

Further USB details in PTP page.

With New Magic Lantern Firmware, Canon DSLRs Get Real-Time HDR Video*

Ryan Koo

12.21.11 @ 12:28PM Tags : canon, canon60d, canont2i, canont3i, dslr, firmware, hdr, hdrx, hdslr, magiclantern

Is real-time High Dynamic Range imaging, ala RED’sHDRx, coming to Canon DSLRs with the next version of Magic Lantern firmware? Well, yes and no — thus the asterisk. The system they’ve developed splits a 24p stream into two 12FPS exposures, one high and one low, and then interpolates the frames. It’s an interesting hack, demonstrated here:

It should be available tomorrow for the Canon 60D, T2i, and T3i. More details from the Vimeo User Group:

• 

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You will get two streams at half frame rate. For example, if you record 25p, you will get two 12.5fps streams. Interpolate them to 25fps and use your favorite HDR software to blend the frames. Our workflow is cross-platform and uses only free software: enfuse, AviSynth, InterFrame and VirtualDub… Will it work on 5D Mark II, 50D and 500D? Maybe. Right now there are some synchronization issues on these cameras. More details coming soon.

While this has a limited application, it looks like an interesting addition, and quite frankly even RED’s more advanced HDRx exposure hack has limited capabilities when shooting motion. More on that soon.

Also coming in the next firmware: variable frame rates. They are limits and the cameras can overheat quickly, but here’s a peak at the feature:

Link: Magic Lantern Wikia page (HDR feature should be available as of 12/22)

[via CheesyCam]

Related Posts

1. New and Improved Magic Lantern AJ5.0 Firmware for the Canon 5D Mark II Released
2. New Magic Lantern Firmware Doubles Video Bitrate of 5D Mark II (Updated with Video)
3. Magic Lantern Firmware Now Available for Canon T2i/550D