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Author Topic: the 3D effect in MF digital  (Read 17818 times)

rainer_v

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the 3D effect in MF digital
« Reply #60 on: November 23, 2009, 05:02:05 pm »

Quote from: BJL
If the "greater 3D effect" is real, I doubt that it has anything to do with either sensor design differences or shallow DOF.
It might be due to higher resolution, in the sense of more lines per mm on the final displayed image, related to the lower degree of enlargement needed to get a print of a given size and so on.

Not sensor technology differences, because the 3D effect claim for MF and LF was made with film too. There, the identical "sensors technology was used, just with different lenses and different degree of enlargement.

Not shallow DOF, because it is very often claimed for images taken at apertures f/2.8 or smaller (most MF lenses do not go beyond f/2.8!), and many good 35mm format primes can give give shallower DOF that f/2.8 in medium format. Unless the "MF 3D effect" claimants have simply never looked much at images made with good 35mm format cameras and lenses at large apertures.


i just visited the "bangkok noir" exhibition of my friend ralf tooten from bangkok. exposed have been prints with a size of app. 100 till 150cm, many shot at night with largest apertures with a nikon 3d and a kodak slr. so beautyfull, atmospheric, 3 dimensional shots, not any miss for more details ( 12mp cameras .... ) , not any miss for more 3d.

i am a no believer of 3d look made by mf sensors. but i am a believer in good photographers.
« Last Edit: November 23, 2009, 05:03:11 pm by rainer_v »
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rainer viertlböck
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rethmeier

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the 3D effect in MF digital
« Reply #61 on: November 23, 2009, 05:50:11 pm »

Quote from: rainer_v
i just visited the "bangkok noir" exhibition of my friend ralf tooten from bangkok. exposed have been prints with a size of app. 100 till 150cm, many shot at night with largest apertures with a nikon 3d and a kodak slr. so beautyfull, atmospheric, 3 dimensional shots, not any miss for more details ( 12mp cameras .... ) , not any miss for more 3d.

i am a no believer of 3d look made by mf sensors. but i am a believer in good photographers.


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Ray

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the 3D effect in MF digital
« Reply #62 on: November 23, 2009, 05:54:04 pm »

Quote from: Wim van Velzen
The artist who painted/drew these portraits mimicked the effect photographers get when using little DoF - so to this artist finds there is some 3D effect in at least some photographs. Why otherwise try to get the same in a painting/drawing?

Correct! Those portraits are in fact photos of drawings of photos of real people. There's a thriving industry in the night markets of Chiang Mai where a small group of artists specialise in reproducing as faithfully as possible, with pencil and charcoal brush, any photograph you give them. They'll attempt to reproduce every hair and wrinkle, and the results are often quite amazing.

[attachment=18143:6074.jpg]

In my opinion, some of these drawings give a clue as to the nature of that 'enhanced' 3D effect that some people tend to notice in MF images. Shallow DoF certainly plays a role, but also a sense of greater accutance in the parts of the image that are in focus. This combination of greater accutance and shallow DoF would result from use of a good MF lens at wide apertures which is also sharp at such wide apertures.

Even though a particular MF lens at, say F4, may be no sharper than an equivalent 35mm format lens at F2.8, the larger sensor of MFDB will ensure equally shallow DoF and the wider pixel spacing (or larger sensor) will result in a higher MTF (than 35mm) at the same 'picture' resolution ( ie. same number of line widths per picture height).

In addition, the lack of an AA filter on the MFDB, will extend such resolution to the Nyquist limit and even create a bit of additional, 'false' resolution which may also contribute the the 'enhanced' 3D effect.




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Nick-T

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the 3D effect in MF digital
« Reply #63 on: November 23, 2009, 08:01:29 pm »

Quote from: Ray
In addition, the lack of an AA filter on the MFDB, will extend such resolution to the Nyquist limit and even create a bit of additional, 'false' resolution which may also contribute the the 'enhanced' 3D effect.

I cannot tell you the number of my clients who book me for my Nyquist limit.
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Ray

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the 3D effect in MF digital
« Reply #64 on: November 23, 2009, 11:55:45 pm »

Quote from: Nick-T
I cannot tell you the number of my clients who book me for my Nyquist limit.

Your clients don't need to know such technical details, but it surely helps if the photographer understands the reason for the results he produces. It's doubtful that any 35mm DSLR could produce quite the same 3-D effect as the best MFDB with a good lens, no matter how sharp the 35mm lens, simply because of the AA filter which limits resolution.
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