Originally posted by normhead No, as in more blurred.
Thx for clarifying that.
Bokeh – properties of blurriness H.H. Hass - Zeiss lens division
RE;
Originally posted by HavelockV Bokeh is not DoF is not Background blur.
A composition parameter which can help us to achieve this objective
is the adjustment of the blurring in front of and behind the main subject by a suitable combination of aperture, focal length and taking distance. A blurred background frees the main subject from distracting unimportant details and increases the three-dimensional illusion of the picture. Blurred parts of the picture can also be decorative and play a very important part in the composition of the picture.
Originally posted by HavelockV Bokeh is purely your aesthetic opinion and can not be measurbated at all. A smartphone can have very pleasing bokeh, while a very fast FF lens can have shitty bokeh.
In spite of the subjective nature of the matter we nevertheless want to attempt to remain faithful to the style and character of our technical articles by describing bokeh with some numbers. Of course, this cannot be done on very simple scales, for example, “a grade 5.5 bokeh“, because blurring always depends on a large number of parameters. But figures can help us to improve our understanding of connections.
All the parameters listed here influence the phenomena outside the focal plane:
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Picture format
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Focal length
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f-number
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The camera-to-subject distance
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Distance to the background or the foreground
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Shapes and patterns of the subject
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Aperture iris shape
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Aberrations of the lens
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Speed of the lens
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Foreground/background brightness
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Colour
It is therefore not surprising that one often hears different and sometimes contradictory judgements about the bokeh of many lenses. Undue generalisations are all too often drawn from single observations.
Many effects are attributed to the lens even though they are mainly caused by the subject in front of the camera. Differences between lenses are often very marginal but are then grossly exaggerated.
Originally posted by HavelockV DoF is easy to calculate but not intentionally the topic of most discussions.
Prey tell share with us those easy calculations of yours. And I don't see you mentioning this.
If we think of conditions where the depth of field stretches from the focus distance into infinity, then it becomes clear that we may have been a bit too naive when talking about doubling or halving the depth of field. Infinite distances can neither be doubled nor divided in two.
But the same rules apply in the format comparison for the hyperfocal distance, the shortest focus distance where the depth of field reaches infinity. We can easily understand this with the help of our object-side light cones again:
A light cone coming from infinity and entering the lens is a bundle of parallel beams and its angular aperture is 0°. Its diameter is the same as the diameter of the entrance pupil. The hyperfocal distance is therefore the distance where the acceptable "object-side circle of confusion diameter" is as large as the entrance pupil.
And once again the rule applies that the smaller sensor format has the smaller entrance pupil if it has the same angular field and the same aperture. The acceptable object-side circle of confusion is therefore already in smaller object fields, meaning it is reached at a shorter distance.
At this point we should make an exception and use a few formulas, because they are the most important ones of the whole topic...
So do you know and use these formulas?
Originally posted by HavelockV Background blur is loosely related to DoF
What are you smoking
I don't know or care where you got this information but I would suggest your boning up a little more using more accurate information.