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Optics Theory - This forum is aimed towards the TECHNICAL side of photographic OPTICS THEORY. There will be some overlap by camera/manufacturer, but this forum is for the heavy duty tech discussions. This is NOT the place to discuss a specific lens or lens line, do that in the appropriate forum. This is the forum to discuss optics or lenses in general, to learn about the tech behind the lenses and images. IF you have a question about a specific lens, post it in the forum about that type of camera, NOT HERE.

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D.o.f.
Old 01-23-2010   #1
FrankS
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D.o.f.

I was surprised to read in a recent thread on another topic, that some photographers do not consider/appreciate the visual effect of limitied DOF when composing/visuallizing their picture. "Just an artifact of low light and large aperture," and, "I would prefer that everything were in focus," were 2 sentiments expressed. As I said, this quite surprised me, because I know that limited and selective DOF is a powerful tool for focusing a viewer's attention to where one wants. I know I'm not alone in thinking this, right?
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Old 01-23-2010   #2
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Do you really need an answer to this question, or are you having one of those "fragile days" and need some emotional support?

Oh, who cares which it is: Of course you are correct. Not recognizing DOF as a powerful compositional tool is just plain ignorant.
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Old 01-23-2010   #3
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Of course selective focus is a repertoire in the photographic toolbox.
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Old 01-23-2010   #4
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Old 01-23-2010   #5
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DOF is always a consideration!
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Old 01-23-2010   #6
bmattock
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Quote:
Originally Posted by FrankS View Post
I was surprised to read in a recent thread on another topic, that some photographers do not consider/appreciate the visual effect of limitied DOF when composing/visuallizing their picture. "Just an artifact of low light and large aperture," and, "I would prefer that everything were in focus," were 2 sentiments expressed. As I said, this quite surprised me, because I know that limited and selective DOF is a powerful tool for focusing a viewer's attention to where one wants. I know I'm not alone in thinking this, right?
I agree with you that selective focus is a compositional tool to be used to draw attention to or away from whatever you wish. It is a tool in the toolbox, one that every serious photographer should attempt to master.

Quite apart from the common Western understanding of 'bokeh', selective focus is not about the appearance of the out-of-focus areas as much as the use of OoF areas to direct attention. However, with that said, there is some subtlety required; too much OoF and the photo looks odd to many eyes; too little and it's not truly effective. Some folks find that hard to master or find that they prefer the 'wide open at all times' heavy OoF look. No accounting for taste, but I try to use it in a 'just enough and no more' fashion, not all out or all in.

Our human eyes see OoF areas much as the camera lens does, but our minds filter the results so we think everything is in sharp focus unless we think about it. Kind of like not being aware of our own heartbeats, though we have them.

There are so many aspects of photography that one can exert creative control over if one wishes too. This is one of them.
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Old 01-23-2010   #7
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Originally Posted by Gumby View Post
Do you really need an answer to this question, or are you having one of those "fragile days" and need some emotional support?

Oh, who cares which it is: Of course you are correct. Not recognizing DOF as a powerful compositional tool is just plain ignorant.
What sort of day are you having?
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Old 01-23-2010   #8
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What sort of day are you having?
Whatever do you mean? And why would you care?
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Old 01-23-2010   #9
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Whatever do you mean? And why would you care?
Quite right. Carry on.
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Old 01-23-2010   #10
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I'm 100% with you Frank. To me, especially in portraits nice bokeh or shallow dof can make or break a photograph! When I take a photo I almost always make consideration to the amount of out of focus area I hope to acheive! When I first started learning about photography & reading every book I could get my hands on bluring the BG was an artistic ability. Now it seems to have all but disappeared. Might be these newer cameras aren't all what there cracked up to be.
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Old 01-23-2010   #11
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Absolutely. This is one of the main attractions of using rangefinders, particularly Leicas as their lenses are designed to shoot wide open. In fact you may say this is much of what what you pay for in good quality fast glass. And its not only Leica glass. I recently bought a Canon 50mm f1.2 just for portraits as I want a slightly softer portrait lens that is also capable of extreme shallow dof. I anticipate it being used almost always at near full aperture for just these reasons. Otherwise I will use another lens.

Even with SLR photography I like to shoot for a specific dof using a fast prime. I honestly think anyone who does not understand this option is missing something in their photographic education. The following photos were taken with DSLRs but you can see that a shallow dof (supported by some creative dodging and burning in post processing is a key element of what I was going for.)





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Old 01-23-2010   #12
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Quite right. Carry on.
Thanks!

But I know why you asked. The question struck me as rather odd, considering who asked it. Y'know, like how the question "Do you think I'm pretty" takes on different meanings when asked by different people. When my wife asks me that, I know she's needing a little bit of emotional support; she really doesn't want, or need, an answer. When someone elses wife asks that question... well, sir, it becomes a real question and the answer counts.
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Old 01-23-2010   #13
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BTW, Bill, I'm having a GREAT day!
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Old 01-23-2010   #14
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Ed, I jsut wanted to begin a topic of conversation that was mixed into BetaMax and fountain pens and sensor sizes in that other thread. Yes, I know the answer to the question I was asking, but now you know why I asked it. Gently poking at a hornet's nest, again? BTW, do you think I look fat?
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Old 01-23-2010   #15
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Originally Posted by nikonhswebmaster View Post
It is indeed a powerful tool if you are shooting fashion for Gap and want the clothes to be the center of focus in their catalog, and do not want to infringe on the trademarks or logos which may appear in the background (or create recognizable faces).
In that case many pros use a 180 2.8 or even a 300 to achieve the effect. I have seen them using radios they get so far from the model.

And it works very well for product photography for the same reason, you can isolate a product on a table and soften other items around it.

But... the effect is so heavily used in advertising, that it is difficult to avoid making photographs using the technique look like anything but a magazine ad.

It can also work well for formal portraits and the like. So it is something all pros need in their arsenal of techniques.

There are exceptions of course, in the art and journalistic world, but many examples shown by proponents, are the product of accident, not intention.
You see, I think/know it is a more generally useful tool than you state.

You would have to be in the head of the photographer to say that, otherwise it is just projection/conjecture on your part.
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Old 01-23-2010   #16
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BTW, do you think I look fat?
Ummm... I'm smart enough to not touch that one!

Best of luck with the hornets!
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Old 01-23-2010   #17
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I'm thinking that the "everything in focus" snapshot technique is heavily overused, as that is the only effect that the small sensor digital cameras are capable of (except in macro mode). I prefer to look at images created with some thought behind them.
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Old 01-23-2010   #18
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DoF is reason why Av-style cameras like Yashica Electro are natural for me instead of Oly 35RC or Konica Auto S2 (both happily can be operated in manual mode).

Though speed also is powerful tool in photographer's arsenal. To name a few, I find pictures including motion in foreground shot at speed freezing movement, lacking something. In some sense they are similar to pictures done with small apertures.
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Old 01-23-2010   #19
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Yeah, pretty boring, isn't it?




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Old 01-23-2010   #20
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>>Our human eyes see OoF areas much as the camera lens does<<
As someone fairly nearsighted, in my experience the human eye/brain combo has fairly "harse" out of focus effects. I think the brain does a considerable amount of over-the-top "sharpening," equivalent of Unsharp Max with all the sliders pulled far right.

Agree with general consensus above -- learning to control depth of field is a very important photography tool.
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Old 01-23-2010   #21
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Quote:
Originally Posted by btgc View Post
DoF is reason why Av-style cameras like Yashica Electro are natural for me instead of Oly 35RC or Konica Auto S2 (both happily can be operated in manual mode).

Though speed also is powerful tool in photographer's arsenal. To name a few, I find pictures including motion in foreground shot at speed freezing movement, lacking something. In some sense they are similar to pictures done with small apertures.
I agree with that.
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Old 01-23-2010   #22
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Sometimes ignorance saves a lot of time, and angst.
Sometimes... in my experience it is "most of the time." It can be really, really troubling when someone enlightens our ignorance, don't you think?
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Old 01-23-2010   #23
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I know I'm not alone in thinking this, right?
You are not alone!
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Old 01-23-2010   #24
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And it works very well for product photography for the same reason, you can isolate a product on a table and soften other items around it.

But... the effect is so heavily used in advertising, that it is difficult to avoid making photographs using the technique look like anything but a magazine ad.

It can also work well for formal portraits and the like. So it is something all pros need in their arsenal of techniques.
Sports and wildlife as well, I'd say.

Quote:
There are exceptions of course, in the art and journalistic world, but many examples shown by proponents, are the product of accident, not intention.
I've shown this one before, so my apologies, but it was quite intentional. Neither too much nor too little, I wanted not just to throw the background of focus, but also to create a particular feeling. I intentionally used an 85mm lens of old design and made creative use of exposure as well to get the effect I wanted.


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Old 01-23-2010   #25
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Oddly I was thinking of Andy Warhol's polaroid photos when I wrote that.

http://tmagazine.blogs.nytimes.com/2...hol-polaroids/
IMO, those jock photos may be considered good or worthwhile, only because of the celebrity of the photographer and/or the subjects. Art dealers can sell these for profit, that explains their interest. If I presented these photos, but of ordinary people, do you think a gallery would be interested?
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