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09-21-2010, 06:54 PM   #1
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In Search Of A Bokeh-less Lens

I own K-x and K-7. I am looking for a "bokehless" lens, i.e., a lens which has "infinite" depth of field. I would like to hear from the experienced photographers which Pentax lens approaches this ideal.

Bokeh or bocca is due to the defect of a lens system which is unable to focus all the 3-dimensional objects unto a 2-dimensional plane. Many photographers use this defect to isolate the subject from the background. Fortunately, human eyes do not have bokeh. Why can't they make camera lenses like human eyes?

My dog's eyes are like those "Limited" camera lenses with good bokeh; he could not see the rabbit 7' away in the grass, but he could smell it. The dog will see it until the rabbit starts to move.


Last edited by violini; 09-27-2010 at 03:00 PM.
09-21-2010, 06:58 PM   #2
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All lenses can have infinite (Or at least, near infinite) depth of field. It's called hyperfocal distance.

This is a combination of aperture and focal range that maximizes depth of field.

Hyperfocal Distance
09-21-2010, 07:02 PM   #3
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The human eye most certainly has bokeh. Close one eye, hold up your finger, and look at it. Pay attention to what is behind your finger. Now look at something behind your finger.
09-21-2010, 07:32 PM   #4
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20mm lens F22 = hyperfocal distance from ~0.3m to infinity = no bokeh. Done!

The human eye certainly has bokeh. Look at a mountain and hold your finger in front on your eye - it won't be sharp


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09-21-2010, 07:49 PM   #5
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One of these?

Frazier Lens

I dont think it is available in a K-mount (or Canon/Nikon/Sony/Oly for that matter)
09-21-2010, 07:52 PM   #6
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brofkand, thanks for the link about hyperfocal distance.

The lens in the eye is a soft lens; the muscle can change the focal length instantly. That's why we can see objects near and afar.

Last edited by violini; 09-21-2010 at 07:57 PM.
09-21-2010, 07:58 PM   #7
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You can always use a pinhole?
09-21-2010, 08:09 PM   #8
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QuoteOriginally posted by Ratmagiclady Quote
You can always use a pinhole?
Best answer, in fact, the only correct answer! Well done imho Ratmagiclady!

09-21-2010, 08:11 PM   #9
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A pic w/o bokeh actually looks flat. Bokeh is what emulates that 3D feel on 2D photos.
09-21-2010, 08:25 PM   #10
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buy a compact point and shoot, or anything with a tiny sensor. a cellphone perhaps.

stuff that affect DOF:
1. distance from subject
2. aperture of lens
3. focal length*
4. sensor size*
09-21-2010, 08:28 PM   #11
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QuoteOriginally posted by rhodopsin Quote
Best answer, in fact, the only correct answer! Well done imho Ratmagiclady!
Nope, the OP specifically asked for a bokeh-less lens. A pinhole is most certainly not a lens :-)
09-21-2010, 08:41 PM   #12
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What about a fish eye lens?
09-21-2010, 09:23 PM   #13
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Just get a point and shoot! One of the best reasons to get a camera with a larger sensor is so that you can get a narrower depth of field and blur the background.

But, if you do want everything in focus, look into hyperfocal distance. Basically, set the camera to manual focus, zoom out to around 18-20mm, set your focus to around 3ft, and set your aperture to between f/16 and f/22. You'll be golden!
09-21-2010, 09:37 PM   #14
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A fish-eye or ultra wide, like the K15/3.5 at minimum aperature.

Phil.
09-21-2010, 09:55 PM   #15
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QuoteOriginally posted by RawheaD Quote
Nope, the OP specifically asked for a bokeh-less lens. A pinhole is most certainly not a lens :-)
So use a slightly larger pinhole and place a tiny droplet of water on it.
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