Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009...

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Teacher: Kenji Tachibana Digital Digital Photography I Photography I . Art 115 – DOF Art 115 – DOF 8 Slides 8 Slides Copyright © 2003 – 2009 Kenji Tachibana

Transcript of Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009...

Page 1: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography I..

Art 115 – DOFArt 115 – DOF

8 Slides8 Slides

Copyright © 2003 – 2009 Kenji Tachibana

Page 2: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography IArt 115: DOF – Illusion of sharpnessArt 115: DOF – Illusion of sharpness

IIllusion: Sharpnessllusion: Sharpness

Physics says that only the thin plane of focus can Physics says that only the thin plane of focus can actually be sharp. Anything else appearing to be actually be sharp. Anything else appearing to be sharp is a matter of illusion.sharp is a matter of illusion.

Therefore, DOF (depth of field) relies on the Therefore, DOF (depth of field) relies on the appearance of sharpness. And that illusion is related appearance of sharpness. And that illusion is related directly to the actual image size and the viewer’s directly to the actual image size and the viewer’s distance to the image. distance to the image.

Sharpness is a result complex set of stuff coming Sharpness is a result complex set of stuff coming together to create a magic reality That makes together to create a magic reality That makes photographers magicians in part…photographers magicians in part…

Page 3: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography IArt 115: DOF – Illusion of sharpnessArt 115: DOF – Illusion of sharpness

CCircle of Confusion:ircle of Confusion:

There is a specific formula to the appearance of There is a specific formula to the appearance of sharpness and it is called the ‘circle of confusion’. I’ve sharpness and it is called the ‘circle of confusion’. I’ve already like that phrase.already like that phrase.

If you want to know more about it, please Google it. I If you want to know more about it, please Google it. I always found the scientific definition to be not always found the scientific definition to be not satisfying and not practical in daily use.satisfying and not practical in daily use.

Page 4: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography IArt 115: DOF – Illusion of sharpnessArt 115: DOF – Illusion of sharpness

FF/stop Size: Relative/stop Size: Relative

F/8 on any lens resultsF/8 on any lens resultsin a predictable amount in a predictable amount of light reaching theof light reaching thesensor chip.sensor chip.

Although the actual sizeAlthough the actual sizeof the opening may differof the opening may differconsiderably. The example shows the difference considerably. The example shows the difference between a compact digital and a DSLR lenses of between a compact digital and a DSLR lenses of equivalent focal length and the same f/8 f/stop.equivalent focal length and the same f/8 f/stop.

Page 5: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography IArt 115: DOF – Illusion of sharpnessArt 115: DOF – Illusion of sharpness

FF/stop: DOF/stop: DOF

DOF is dependant on theDOF is dependant on theactual size of the openingactual size of the openingrather than the specificrather than the specificf/stop.f/stop.

F/8 on the compact digitalF/8 on the compact digitalActs more like f/16 on a Acts more like f/16 on a DSLR. Another words, in order for a DSLR to achieve DSLR. Another words, in order for a DSLR to achieve the same DOF as the compact digital, it would have to the same DOF as the compact digital, it would have to use f/16 or even f/22.use f/16 or even f/22.

The compact digital may not have the aperture range of The compact digital may not have the aperture range of the DSLR but the natural deep DOF makes up for a lot the DSLR but the natural deep DOF makes up for a lot of the missing f/stop range.of the missing f/stop range...

Page 6: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography IArt 115: DOF – Illusion of sharpnessArt 115: DOF – Illusion of sharpness

FFocal Length & DOF:ocal Length & DOF:

If deep DOF is your mainIf deep DOF is your mainconcern, use the wideconcern, use the wideangle. The compactangle. The compactdigital set to wide (28mmdigital set to wide (28mmequiv.) using f/2.8 canequiv.) using f/2.8 caneasily hold a DOF fromeasily hold a DOF from4’ to infinity on an 8x104’ to infinity on an 8x10print held at a 12“ viewing distance. Usually the wide is print held at a 12“ viewing distance. Usually the wide is used for scenic shots because of its natural deep DOF used for scenic shots because of its natural deep DOF and the wide angle-of-view.and the wide angle-of-view.

Page 7: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography IArt 115: DOF – Illusion of sharpnessArt 115: DOF – Illusion of sharpness

FFocal Length & DOF:ocal Length & DOF:

If shallow DOF is your main If shallow DOF is your main concern, use the telephoto. concern, use the telephoto. The compact digital set to The compact digital set to telephoto (105 mm equiv.) at telephoto (105 mm equiv.) at f/4 (wide open) produces very f/4 (wide open) produces very shallow DOF. shallow DOF.

Usually the telephoto is used Usually the telephoto is used for portraits because of its for portraits because of its natural tendency for shallow natural tendency for shallow DOF. It creates a beautiful DOF. It creates a beautiful selective focus result shown to selective focus result shown to the right.the right.

Page 8: Teacher: Kenji Tachibana Digital Photography I. Art 115 – DOF 8 Slides Copyright © 2003 – 2009 Kenji Tachibana.

Teacher: Kenji TachibanaDigital Photography IDigital Photography ICameron and his team:Cameron and his team:

SSummary: Build good habitsummary: Build good habits

Please keep shooting and place as many shots in Please keep shooting and place as many shots in the bull’s eye as possible. Bull’s eye requirements the bull’s eye as possible. Bull’s eye requirements are yours to set. Although please do your best to are yours to set. Although please do your best to keep the standards high. keep the standards high.

Every time you accept a lack luster image as Every time you accept a lack luster image as being good, you will be building bad habits.being good, you will be building bad habits.

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Teacher: Kenji TachibanaDigital Photography IDigital Photography I

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