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Dienstag, 13 September 2016 13:42

5 Foto-Formeln auf dem Prüfstand

5 Foto-Formeln auf dem Prüfstand

"Sonne lacht, Blende 8!" hat sicherlich jeder schon mal gehört. Fakt ist aber, die meisten dieser und ähnlicher Regeln stammen aus einer Zeit, in der Kameras noch nicht automatisch belichten konnten und man noch einen Film einlegen musste. Es stellt sich also die Frage: wie sehr sollte man sich daran halten? Macht das noch Sinn?

 

 

 

Regel 1 - Der Klassiker: Sonne lacht, Blende 8!

Das kennt jeder, der schon mal eine Kamera in der Hand hatte. Dummerweise beißt sich das mit diversen anderen Weisheiten, angefangen von: „Für Mensch und Tier nimm Blende vier.“, "Blende auf drei – der Hintergrund ist Brei." bis hin zu "Ist selbst Blende 2 zu knapp, nimm einfach den Deckel ab."

Anwendbar: Jein! Diese Regel beschreibt einen Sachverhalt, der so dermaßen allgemein ist, dass man kaum sagen kann, ob es Sinn macht sie zu befolgen. Grundsätzlich ist an sonnigen Tagen nichts zu sagen gegen Blende 8. Man schränkt sich aber kreativ sehr ein, wenn man sich stoisch daran hält. Während Landschaftsfotos meist noch gut gelingen sollten, stößt man bei Bildern mit Portraitcharakter unter Umständen schnell ans gestalterische Limit. Beispielsweise hält sich der Freistellungseffekt mit Blende 8 stark in Grenzen (bis hin zu ist nicht existent), wenn nicht gerade ein riesiger Abstand zwischen Model und Hintergrund besteht.

 

Regel 2 - Sunny Sixteen: Belichtungszeit = 1 / ISO bei Blende f/16

Oder in Worten: an einem sonnigen Tag, stell die Blende auf f/16 und belichte so lange wie der Kehrwert der eingestellten ISO Empfindlichkeit (also z.B. 1/400 s bei ISO400). Erscheint diese Regel auf den ersten Blick ähnlich allgemein wie die erste, so existieren hier immerhin noch diverse Verfeinerungen (f/22 bei Schnee/Sand, f/11 für leichte Bewölkung, f/8 für normale Bewölkung, f/5.6 für starke Bewölkung, f/4 für Sonnenauf-/untergänge).

Anwendbarkeit: Nein. Diese Regel stammt aus einer Zeit, in der der ISO Wert durch den eingelegten Film fest vorgegeben war .Heute kann man wesentlich flexibler auf die herrschenden Lichtverhältnisse reagieren. Außerdem liegt f/16 bei vielen Objektiven bereits hinter dem sog. "sweet spot" (die Blende, mit der das Objektiv die schärfsten Resultate erzielt). Das heißt, die stark geschlossene Blende verursacht bereits wieder Beugungsunschärfen und somit generell unschärfere Bilder als eigentlich möglich. Nicht zuletzt schränkt man sich hier ähnlich stark kreativ ein wie bei Regel 1.

 

Regel 3 - Looney Eleven: Belichtungszeit = 1 / ISO bei Blende f/11

Diese Regel ist das Äquivalent zu Regel 2, nur das Szenario ist ein anderes, nämlich die Mondfotografie. Auch diese Regel ist sehr allgemein, was aber nicht ganz so schlimm ist, denn die Situation ist auch deutlich eingeschränkter. Wenn man den Mond fotografiert, hat man fast immer viel schwarz und einen helleren Punkt im Bild (es sei denn man trickst mit den Double Exposure Features von modernen Kameras). Wenn man nicht gerade ein Teleskop zur Verfügung hat, ist dieser helle Punkt auch nie übermäßig groß. 

Anwendbarkeit: Ja! Diese Regel wird zwar nicht unbedingt beim ersten Versuch ein korrekt belichtetes Bild hervorbringen, bietet aber einen ausgezeichneten Startpunkt für Belichtungsanpassungen. Man liegt selten komplett daneben. Praxis-Pro-Tipp am Rande: Displayhelligkeit so gering wie möglich einstellen, während man den Mond fotografiert. Die Augen haben sich irgendwann an die Dunkelheit gewöhnt und es besteht die Gefahr, dass man mit einem zu hell eingestellten Display alles als Überbelichtung interpretiert. Aber am besten sowieso immer in RAW fotografieren, da kann man dann hinterher noch fast alles regeln. 

 

Regel 4 - Belichtungszeit bei "Mitziehern": 1 / Geschwindigkeit des Subjekts in km/h

Sogenannte Mitzieher sind Fotos, bei denen die Kamera während der Belichtung einem sich bewegenden Subjekt folgt. Mit etwas Übung bleibt so das Subjekt scharf, aber der Hintergrund verwischt. Auf diese Art und Weise entstandene Bilder vermitteln gut den Eindruck von Bewegung, Dynamik und Geschwindigkeit. Es stellt sich in diesem Fall aber die Frage: wie lange muss man für einen Möglichst guten Effekt belichten? Eine zu kurze Belichtung reicht nicht aus um das gewünschte Gefühl zu vermitteln. Eine zu lange Belichtung kann die Umgebung des Subjektes komplett unkenntlich machen und führt sehr wahrscheinlich auch beim Subjekt selbst zu einer verwackelten Darstellung. Eine Antwort gibt diese Mitzieher-Regel. Beispielhaft: Fotografiere den Rennradfahrer, der mit 40km/h fährt 1/40 Sekunde lang und den Sportwagen auf der Rennstrecke, der mit 250 Sachen an dir vorbeirauscht, mit 1/250 Sekunde.

Anwendbarkeit: Jein! Natürlich kommt es auch auf die Brennweite und den Abstand zum Motiv an, aber sobald das Subjekt das Bild einigermaßen gut ausfüllt, kann man sagen: diese Regel produziert brauchbare Ergebnisse. Beispielhaft zeigt das folgende Bild ein Foto, das ich mal auf einer Hochzeit geschossen habe. Die Belichtungszeit war 1/40 Sekunde und wir waren vielleicht etwas schneller unterwegs, maximal aber 50 km/h.

 

Regel 5 - Maximale Belichtungszeit bei Astrofotografie (die "600er Regel"): 600 / (Brennweite * Cropfaktor)

Diese Regel läuft einem auch häufiger als 500er Regel über den Weg, was aber deren Inhalt nicht extreeem verfälscht. Möchte man den Sternenhimmel fotografieren, "verwischen" die einzelnen Sterne aufgrund der Erdrotation während einer Langzeitbelichtung. Die verwendete Brennweite hat einen maßgeblichen Einfluss darauf, wie schnell das passiert (übrigens auch die Auflösung des Kamera Sensors, aber wir wollen es an dieser Stelle nicht unnötig kompliziert machen). Möchte man diesen Verwischungseffekt nicht haben, sollte man nicht länger belichten, als diese Regel vorgibt. Beispiel 24mm Objektiv an einer APS-C Kamera: 600 / (24*1,6) = 15,6 Sekunden. Belichtet man länger, ziehen die Sterne Spuren im Bild (was manchmal natürlich aber auch erwünscht sein kann). 

Anwendbarkeit: Ja! Das kommt in etwa hin. Wenn man nicht gerade mit einer 150 MP Kamera Bilder macht, die hinterher auf Hauswände tapeziert werden sollen, funktioniert diese Regel ziemlich gut. Das folgende Bild zeigt ein zugegebenermaßen etwas extremeres Beispiel. Verwendet wurde ein 8mm Fisheye an der Canon EOS 7D. Das heißt: 600 / (8 * 1,6) = max. 46,8 Sekunden. Das Bild wurde aber "nur" 30 Sekunden belichtet. Es hätte also noch etwas zeitlichen Puffer gegeben. Dafür gibt's aber auch absolut keine Anzeichen von Verwischungen.

 

Fazit:

Nicht alle Weisheiten aus analogen Tagen machen heute noch Sinn, aber erstaunlich viele. Gerade die Mitzieher- und die 600er Regel haben durch den technischen Fortschritt nichts an Gültigkeit eingebüßt und es kann sich lohnen, sie im Hinterkopf zu behalten.

P.S.: Widersprüche oder Ergänzungen gerne in die Kommentare!

 

 


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19339 Kommentare

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    “We got 53 candidates for anomalies that cannot be well explained, but can’t say that all of them are Dyson sphere candidates, because that’s not what we are specifically looking for,” said Gabriella Contardo, a postdoctoral research fellow at the International School for Advanced Studies in Trieste, Italy, who led the earlier study. She added that she plans to check the candidates against Suazo’s model to see how many tie into it.
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    “You need to eliminate all other hypotheses and explanations before saying that they could be a Dyson sphere,” she added. “To do so you need to also rule out that it’s not some kind of debris disk, or some kind of planetary collision, and that also pushes the science forward in other fields of astronomy — so it’s a win-win.”

    Both Contardo and Suazo agree that more research is needed on the data, and that ultimately they could turn to NASA’s James Webb Space Telescope for more information, as it is powerful enough to observe the candidate stars directly. However, because of the lengthy, competitive procedures that regulate use of the telescope, securing access might take some time.
    If Dyson spheres really exist, what could they be used for? “If you picture ourselves having as much energy as the sun is providing every second, we could do unheard of things,” Suazo said. “We could do interstellar travel, maybe we could even move the entire solar system to our preferred location, if we wanted.”

    But don’t hold your breath, because the technology and the raw materials required to build the hypothetical structures are far beyond humanity’s grasp.

    “They are so big that everything we have on Earth would not be enough to build them,” Suazo added. “Freeman Dyson said that we should dismantle Jupiter — the whole planet (for the raw materials).”

    That supercolossal scale probably means that Dyson spheres, if they exist at all, are very rare.

  • Kommentar-Link Dannyrom Donnerstag, 17 April 2025 22:59 gepostet von Dannyrom

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    “As a young scientist, Dyson showed that three competing quantum theories were actually the same theory — he summarily ended the competition,” said William Press, the Leslie Surginer Professor of Computer Science and Integrative Biology at the University of Texas at Austin. He was not involved in the study. “Later, he applied his genius to areas of astronomy, cosmology, the extraterrestrial realm, and also the very real problem of nuclear proliferation here on planet Earth. At the time of his death, he was recognized as a provocative and creative thinker.”

    George Dyson also attested to his father’s fascination and comprehensive reach across disciplines.
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    “Taking advantage of a short attention span and an aversion to bureaucracy, he contributed to five fields of mathematics and eleven fields of physics, as well as to theoretical biology, engineering, operations research, literature, and public affairs,” the younger Dyson said. “Many of his ideas were controversial, with one of his guiding principles being that ‘It is better to be wrong than to be vague.’”

    The approach of the researchers behind the new study could offer a more fruitful path in the search for extraterrestrial intelligence, said Tomotsugu Goto, an associate professor of astronomy at the National Tsing Hua University in Taiwan. He also was not involved with the study.

    “However, contamination by circumstellar debris disks, which mimic Dyson Sphere infrared signatures, remains a concern,” he added in an email. “Authors argue that the debris disks around (dwarf stars) are rare, but the 7 candidate authors selected out of 5 million sources are also rare. Despite this, the seven candidates warrant further investigation with powerful telescopes for a more definitive evaluation.”

  • Kommentar-Link Wileyfluic Donnerstag, 17 April 2025 22:32 gepostet von Wileyfluic

    ‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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    What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

    “One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
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    If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
    Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

    In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

    “Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

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    Scientist Dr. Randal Voss gets the occasional reminder that he’s working with a kind of superstar. When he does outreach events with his laboratory, he encounters people who are keen to meet his research subjects: aquatic salamanders called axolotls.

    The amphibians’ fans tell Voss that they know the animals from the internet, or from caricatures or stuffed animals, exclaiming, “‘They’re so adorable, we love them,’” said Voss, a professor of neuroscience at the University of Kentucky College of Medicine. “People are drawn to them.”
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    Take one look at an axolotl, and it’s easy to see why it’s so popular. With their wide eyes, upturned mouths and pastel pink coloring, axolotls look cheerful and vaguely Muppet-like.

    They’ve skyrocketed in pop culture fame, in part thanks to the addition of axolotls to the video game Minecraft in 2021. These unusual salamanders are now found everywhere from Girl Scout patches to hot water bottles. But there’s more to axolotls than meets the eye: Their story is one of scientific discovery, exploitation of the natural world, and the work to rebuild humans’ connection with nature.

    A scientific mystery
    Axolotl is a word from Nahuatl, the Indigenous Mexican language spoken by the Aztecs and an estimated 1.5 million people today. The animals are named for the Aztec god Xolotl, who was said to transform into a salamander. The original Nahuatl pronunciation is “AH-show-LOAT”; in English, “ACK-suh-LAHT-uhl” is commonly used.
    Axolotls are members of a class of animals called amphibians, which also includes frogs. Amphibians lay their jelly-like eggs in water, and the eggs hatch into water-dwelling larval states. (In frogs, these larvae are called tadpoles.)

    Most amphibians, once they reach adulthood, are able to move to land. Since they breathe, in part, by absorbing oxygen through their moist skin, they tend to stay near water.

    Axolotls, however, never complete the metamorphosis to a land-dwelling adult form and spend their whole lives in the water.

    “They maintain their juvenile look throughout the course of their life,” Voss said. “They’re teenagers, at least in appearance, until they die.”

  • Kommentar-Link HarryBat Donnerstag, 17 April 2025 19:52 gepostet von HarryBat

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    Dyson died in 2020 before any of his spheres could be found — although they are just one of a dozen ideas that bear his name.
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    “As a young scientist, Dyson showed that three competing quantum theories were actually the same theory — he summarily ended the competition,” said William Press, the Leslie Surginer Professor of Computer Science and Integrative Biology at the University of Texas at Austin. He was not involved in the study. “Later, he applied his genius to areas of astronomy, cosmology, the extraterrestrial realm, and also the very real problem of nuclear proliferation here on planet Earth. At the time of his death, he was recognized as a provocative and creative thinker.”

    George Dyson also attested to his father’s fascination and comprehensive reach across disciplines.
    https://kra30att.cc
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    “Taking advantage of a short attention span and an aversion to bureaucracy, he contributed to five fields of mathematics and eleven fields of physics, as well as to theoretical biology, engineering, operations research, literature, and public affairs,” the younger Dyson said. “Many of his ideas were controversial, with one of his guiding principles being that ‘It is better to be wrong than to be vague.’”

    The approach of the researchers behind the new study could offer a more fruitful path in the search for extraterrestrial intelligence, said Tomotsugu Goto, an associate professor of astronomy at the National Tsing Hua University in Taiwan. He also was not involved with the study.

    “However, contamination by circumstellar debris disks, which mimic Dyson Sphere infrared signatures, remains a concern,” he added in an email. “Authors argue that the debris disks around (dwarf stars) are rare, but the 7 candidate authors selected out of 5 million sources are also rare. Despite this, the seven candidates warrant further investigation with powerful telescopes for a more definitive evaluation.”

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    ‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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    What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

    “One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
    https://kra30c.cc
    Кракен даркнет
    If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
    Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

    In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

    “Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

  • Kommentar-Link Josephmep Donnerstag, 17 April 2025 18:46 gepostet von Josephmep

    Broken spheres
    Dyson died in 2020 before any of his spheres could be found — although they are just one of a dozen ideas that bear his name.
    kra31at
    “As a young scientist, Dyson showed that three competing quantum theories were actually the same theory — he summarily ended the competition,” said William Press, the Leslie Surginer Professor of Computer Science and Integrative Biology at the University of Texas at Austin. He was not involved in the study. “Later, he applied his genius to areas of astronomy, cosmology, the extraterrestrial realm, and also the very real problem of nuclear proliferation here on planet Earth. At the time of his death, he was recognized as a provocative and creative thinker.”

    George Dyson also attested to his father’s fascination and comprehensive reach across disciplines.
    https://kra30att.cc
    kra31at
    “Taking advantage of a short attention span and an aversion to bureaucracy, he contributed to five fields of mathematics and eleven fields of physics, as well as to theoretical biology, engineering, operations research, literature, and public affairs,” the younger Dyson said. “Many of his ideas were controversial, with one of his guiding principles being that ‘It is better to be wrong than to be vague.’”

    The approach of the researchers behind the new study could offer a more fruitful path in the search for extraterrestrial intelligence, said Tomotsugu Goto, an associate professor of astronomy at the National Tsing Hua University in Taiwan. He also was not involved with the study.

    “However, contamination by circumstellar debris disks, which mimic Dyson Sphere infrared signatures, remains a concern,” he added in an email. “Authors argue that the debris disks around (dwarf stars) are rare, but the 7 candidate authors selected out of 5 million sources are also rare. Despite this, the seven candidates warrant further investigation with powerful telescopes for a more definitive evaluation.”

  • Kommentar-Link ScottFup Donnerstag, 17 April 2025 18:43 gepostet von ScottFup

    Why axolotls seem to be everywhere — except in the one lake they call home
    kraken
    Scientist Dr. Randal Voss gets the occasional reminder that he’s working with a kind of superstar. When he does outreach events with his laboratory, he encounters people who are keen to meet his research subjects: aquatic salamanders called axolotls.

    The amphibians’ fans tell Voss that they know the animals from the internet, or from caricatures or stuffed animals, exclaiming, “‘They’re so adorable, we love them,’” said Voss, a professor of neuroscience at the University of Kentucky College of Medicine. “People are drawn to them.”
    https://kra30s.cc
    kraken даркнет

    Take one look at an axolotl, and it’s easy to see why it’s so popular. With their wide eyes, upturned mouths and pastel pink coloring, axolotls look cheerful and vaguely Muppet-like.

    They’ve skyrocketed in pop culture fame, in part thanks to the addition of axolotls to the video game Minecraft in 2021. These unusual salamanders are now found everywhere from Girl Scout patches to hot water bottles. But there’s more to axolotls than meets the eye: Their story is one of scientific discovery, exploitation of the natural world, and the work to rebuild humans’ connection with nature.

    A scientific mystery
    Axolotl is a word from Nahuatl, the Indigenous Mexican language spoken by the Aztecs and an estimated 1.5 million people today. The animals are named for the Aztec god Xolotl, who was said to transform into a salamander. The original Nahuatl pronunciation is “AH-show-LOAT”; in English, “ACK-suh-LAHT-uhl” is commonly used.
    Axolotls are members of a class of animals called amphibians, which also includes frogs. Amphibians lay their jelly-like eggs in water, and the eggs hatch into water-dwelling larval states. (In frogs, these larvae are called tadpoles.)

    Most amphibians, once they reach adulthood, are able to move to land. Since they breathe, in part, by absorbing oxygen through their moist skin, they tend to stay near water.

    Axolotls, however, never complete the metamorphosis to a land-dwelling adult form and spend their whole lives in the water.

    “They maintain their juvenile look throughout the course of their life,” Voss said. “They’re teenagers, at least in appearance, until they die.”

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