That's not bokeh

Started Aug 3, 2011 | Discussions
LincolnB
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That's not bokeh
Aug 3, 2011

It's heat rising off the field.

There was a flock of buzzards eating dead mice etc. from this field of freshly mowed hay. With a 400mm lens the distortions from the heat rising off the field was quite noticeable. it made it very difficult to get a sharp shot. Of course being buzzards they stayed in the areas with the most updraft! The very short depth of field at this focal length also proved challenging. All in all an interesting learning experience. I think a native 300mm autofocus M43 lens would have had a slighly better result than this $65 manual focus lens but it still would have been a challenge.

I applied a little bit of sharpening to the bird but nothing else in the shot. It's also slightly cropped.

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LTZ470
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Re: That's not bokeh
In reply to LincolnB, Aug 3, 2011

looks like it came out of a Sony with Max NR!
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WC Wood
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Re: That's not bokeh...or heat distortion
In reply to LincolnB, Aug 3, 2011

LincolnB wrote:

It's heat rising off the field.

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That distortion is weird, but it seems, first, that ground covered with grass or hay will not get hot enough to cause heat distortion like that. Second, the buzzard would show distorted also.

W.C.

http://www.flickr.com/photos/29320396@N05/show/

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LincolnB
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Re: That's not bokeh...or heat distortion
In reply to WC Wood, Aug 3, 2011

WC Wood wrote:

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That distortion is weird, but it seems, first, that ground covered with grass or hay will not get hot enough to cause heat distortion like that. Second, the buzzard would show distorted also.

W.C.

The heat rising was obvious in the viewfinder. I could see it with the naked eye as well. The buzzard was sharpened a bit in that picture. Also, the buzzard is closer than the background so the distortion would not be as bad.

Here's a detail from another shot, this time straight out of the camera. Notice especially how the objects in the background like the fence and the bench appear bent and warped. That's heat rising.

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LincolnB
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Here's the same lens, different weather
In reply to WC Wood, Aug 3, 2011

Late afternoon in the spring looking nearly straight up vs. midday summer looking across a field

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Sean Nelson
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Re: That's not bokeh...or heat distortion
In reply to WC Wood, Aug 3, 2011

WC Wood wrote:

Second, the buzzard would show distorted also.

The buzzard is a lot closer than the background so there's a lot less disturbed air between it and the camera to cause refraction distortions.

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Peter Gregg
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Re: That's not bokeh
In reply to LincolnB, Aug 3, 2011

Just a heads up. Bokeh is not the blurriness of the background. It is the roundness of specular points in the blurry background showing the lenses ability to create a smooth transitions or the quality of actual points of light.

A good example would be a very round point of light versus an octagonal shape of a point of light. The octagonal shape is showing you the blades of the lens making the called for f stop. That (usually) is why a lens with more blades makes a smoother transition giving you a better bokeh.

Peter

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WC Wood
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Re: Here's the same lens, different weather
In reply to LincolnB, Aug 3, 2011
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I stand corrected. The weather was crazy hot for awhile, wasn't it....

W.C.

http://www.flickr.com/photos/29320396@N05/show/

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LincolnB
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Re: Here's the same lens, different weather
In reply to WC Wood, Aug 3, 2011

WC Wood wrote:

The weather was crazy hot for awhile, wasn't it....

W.C.

It hadn't been hot here in the PNW until recently. Big temp differences yesterday. To the left of this field you could see snow in the mountains!

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dotborg
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Re: That's not bokeh
In reply to Peter Gregg, Aug 3, 2011

I'm pretty sure that bokeh (boke) literally means "blur" in Japanese.

Peter Gregg wrote:

Just a heads up. Bokeh is not the blurriness of the background. It is the roundness of specular points in the blurry background showing the lenses ability to create a smooth transitions or the quality of actual points of light.

A good example would be a very round point of light versus an octagonal shape of a point of light. The octagonal shape is showing you the blades of the lens making the called for f stop. That (usually) is why a lens with more blades makes a smoother transition giving you a better bokeh.

Peter

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Doug Kerr
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Re: That's not bokeh
In reply to Peter Gregg, Aug 8, 2011

Hi, Peter,

Peter Gregg wrote:

Just a heads up. Bokeh is not the blurriness of the background. It is the roundness of specular points in the blurry background showing the lenses ability to create a smooth transitions or the quality of actual points of light.

Actually, bokeh refers to the nature of the blur figures produced from out-of-focus object features (including, but not limited to, point sources or specular objects). It does not just refer to that phenomenon when we think it is "nicely done". Bokeh does not refer to "the degree of roundness" of the blur figure.

Best regards,

Doug

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Doug Kerr
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Re: That's not bokeh
In reply to dotborg, Aug 8, 2011

Hi, d,

dotborg wrote:

I'm pretty sure that bokeh (boke) literally means "blur" in Japanese.

Essentially so - perhaps "blurry" or "blurriness".

Best regards,

Doug

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