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Autumn leaf


Autumn leaf
Photo Information
Copyright: philippe hornus (amanengone) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 188 W: 54 N: 412] (2113)
Genre: Plants
Medium: Color
Date Taken: 2009-11-15
Categories: Rain Forest
Camera: Olympus E 30, ZUIKO DIGITAL ED 50 mm 1:2.0, Sandisk Ultra II 8GB
Exposure: f/22, 1/4 seconds
Details: Tripod: Yes
Photo Version: Original Version
Date Submitted: 2009-11-17 15:49
Viewed: 2873
Points: 4
[Note Guidelines] Photographer's Note [French]
The subject

This photo shows a leaf during its decomposition in the fall. As can be seen, the cellulose of the leaf lamina has almost completely disappeared. This is due probably to the action of bacteria, as they commonly exists in soil and in the stomachs of ruminants (some fungi could lead to the same result, but here I do not see the traces).

This is one of the first steps of the reactions that produce the soil organic matter, humus. Associated with various clays, it is the argilo-humic complex giving the soil fertility and thereby guaranteeing the mankind prosperity.

These reactions occur most frequently in the leaf litter after they fall to the ground, what is surprising here is that the phenomenon occurred while the leaves are still attached to the plant.

The photography

Photo taken in mid afternoon, overcast and threatening. The brightness is low, and particularly with halftone colors.

The camera is set to aperture priority, with sensitivity equivalent iso-400. The macro objective allows a close up (a few centimeters from the subject).

The f/22 aperture provides a sufficient depth of field, on almost the entire thickness of the leaf lamina, despite the proximity of the subject.

With such an opening and a so low brightness, it was necessary to shot long enough (1/4 th), with a tripod.

No use of flash for the autumnal tones of the scene.

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Critiques [Translate]

Cher Philippe

Je suis tout simplement enchanté! Ton (je me permets le "tu") image est magnifique. Elle me plaît pour plusieures raisons. L'unité des couleurs lui donne un impact particulier et crée une atmosphère chaude. Ceci est en contradiction avec le message de l'image qui montre une feuille morte. La tension crée par cette opposition éveille l'intérêt. En plus, la haute qualité technique ainsi que les notes instructives et intéressantes lui donnent une dimension encore plus profonde. Magnifique!

Amitiés

Markus

  • Great 
  • anel Gold Star Critiquer/Gold Note Writer [C: 3053 W: 3 N: 8715] (40574)
  • [2009-11-23 3:56]
  • [+]

Bonjour Philipe,
Ton image m'a fait sourire, car j'ai quelques feuilles de ce genre dans mes archives. Mais pas si bien photographiées. J'aime ces teintes fines et discrètes et l'excellente netteté de ce qui reste de la feuille qui ressemble à de la dentelle. Très beau!
Un grand merci aussi pour ta notice bien structurée
Meilleures pensées
Anne

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