Gast_17519
Guest
Um nochmal kurz auf das Blitzen zurückzukommen:
http://www.naturescapes.net/042004/do0404.htm
EFFECTS OF FLASH
Nature photography subjects may be startled by a sudden unexpected burst of light; some may depart because of it, others may continue what they were doing and may not even appear reactive to subsequent use of flash. Light intensity, degree of focus, and ambient light are all factors when considering possible impact on visual acuity.
Fill-flash involves the balance of ambient and artificial lighting. In situations when fill-flash is used, cone cells are active, and they are designed to work in all but dim light. Because of this, the use of fill-flash on animals and birds is not likely to have any effect on their visual systems. Cone cells do not bleach to a nonfunctional state in bright light as the rod cells do.
Flash as main light in dim light conditions can produce a temporary reduction in vision but not permanent damage.
In total darkness, use of flash may cause a temporary reduction in vision for 5-20 minutes. It takes one hour of dark conditioning to achieve maximum electrical responses from rod cells in the retina. The regeneration of rod function even after "bleaching" by a bright light is not linear with time. Animals and birds probably have 50% return of function in the first five minutes, and 75% in another five minutes. The rods are rapidly moving from zero function to full sensitivity during that time, with the greatest return of function per time unit occurring in the first 10-15 minutes.
Because of the initial impairment of vision from flash in total darkness, repeated flash of birds or animals in this situation is not advocated. Ethical nature photographers avoid altering their subject?s behavior. The judicious use of flash in completely dark situations causing a brief vision alteration must be offset by the educational value of the photograph made. Technically excellent pictures of owls and other animals in their natural environment made at night with flash may, in the end, benefit the species as a result of increased public awareness. In select situations, the use of flash may be justified. Many nocturnal species rely upon other senses in combination with vision during dim or dark conditions; for example, the auditory capabilities of owls at night are probably far more important for hunting as compared with the visual sense...
...Dennis Olivero obtained his DVM degree from the University of Minnesota where he also did an internship in small animal medicine and surgery.
Fazit:
Mir ist schon klar, dauerhafte Schäden verursacht man i.d.R. nicht, jedoch (auch abh. von Lichtverhältnissen) eine zwischenzeitliche Beeinträchtigung des Sehvermögens. Aber bleibende Schäden sind auch bei einem Tritt gegen das Schienbein oder einen leichten Schlag gegen den Hinterkopf nicht zu erwarten. Dass einigen Tierfotographen das egal ist, ist wohl eine Philosophiefrage.
(Das geht nicht gegen dich, sonnenblume6969 !, ich wollte die Artikel nur der Vollständigkeit halber anfügen. Ich hoffe ich erwische "meinen" Eisvogel auch mal in so ner Perspektive. Oder viell. wenn er sich gerade in den Teich stürzt..(Träumerei))
http://www.naturescapes.net/042004/do0404.htm
EFFECTS OF FLASH
Nature photography subjects may be startled by a sudden unexpected burst of light; some may depart because of it, others may continue what they were doing and may not even appear reactive to subsequent use of flash. Light intensity, degree of focus, and ambient light are all factors when considering possible impact on visual acuity.
Fill-flash involves the balance of ambient and artificial lighting. In situations when fill-flash is used, cone cells are active, and they are designed to work in all but dim light. Because of this, the use of fill-flash on animals and birds is not likely to have any effect on their visual systems. Cone cells do not bleach to a nonfunctional state in bright light as the rod cells do.
Flash as main light in dim light conditions can produce a temporary reduction in vision but not permanent damage.
In total darkness, use of flash may cause a temporary reduction in vision for 5-20 minutes. It takes one hour of dark conditioning to achieve maximum electrical responses from rod cells in the retina. The regeneration of rod function even after "bleaching" by a bright light is not linear with time. Animals and birds probably have 50% return of function in the first five minutes, and 75% in another five minutes. The rods are rapidly moving from zero function to full sensitivity during that time, with the greatest return of function per time unit occurring in the first 10-15 minutes.
Because of the initial impairment of vision from flash in total darkness, repeated flash of birds or animals in this situation is not advocated. Ethical nature photographers avoid altering their subject?s behavior. The judicious use of flash in completely dark situations causing a brief vision alteration must be offset by the educational value of the photograph made. Technically excellent pictures of owls and other animals in their natural environment made at night with flash may, in the end, benefit the species as a result of increased public awareness. In select situations, the use of flash may be justified. Many nocturnal species rely upon other senses in combination with vision during dim or dark conditions; for example, the auditory capabilities of owls at night are probably far more important for hunting as compared with the visual sense...
...Dennis Olivero obtained his DVM degree from the University of Minnesota where he also did an internship in small animal medicine and surgery.
Fazit:
Mir ist schon klar, dauerhafte Schäden verursacht man i.d.R. nicht, jedoch (auch abh. von Lichtverhältnissen) eine zwischenzeitliche Beeinträchtigung des Sehvermögens. Aber bleibende Schäden sind auch bei einem Tritt gegen das Schienbein oder einen leichten Schlag gegen den Hinterkopf nicht zu erwarten. Dass einigen Tierfotographen das egal ist, ist wohl eine Philosophiefrage.
(Das geht nicht gegen dich, sonnenblume6969 !, ich wollte die Artikel nur der Vollständigkeit halber anfügen. Ich hoffe ich erwische "meinen" Eisvogel auch mal in so ner Perspektive. Oder viell. wenn er sich gerade in den Teich stürzt..(Träumerei))
