Thursday, October 09, 2014

Autumn cherry leaves

click photo to enlarge
Apparently the intensity of colour of some autumn leaves is affected by the weather that prevails before and during the time that chlorophyl production in them begins to decline. A spell of warm, sunny weather with cool but not freezing nights results in the leaves producing sugars during the day that are retained by the closing of veins prompted by the lower temperatures.The accumulated sugar combined with the colder nights triggers the production of the anthocyanin pigments that produce the reds, oranges and purples in leaves. Yellow leaves are produced by carotenoids that are always present and not weather-dependant (which must account for why the lime trees' leaves are a fine show every year).

I've been looking at our ornamental cherry trees recently, wondering if they would produce a good show of colour, particularly some of the fiery reds and oranges that make the garden come alive. The recent weather and the information above suggests they will. However, that weather is about to change with rain, wind and storms coming in from the west. With that in mind I decided to take matters into my own hands and make the best of the leaves as they are now. The low sun enhanced the hues of several that were on the ground, allowing me to achieve my aim of a photograph of contrasts and colour.

photograph and text © Tony Boughen

Camera: Canon 5D Mk2
Mode: Aperture Priority
Focal Length: 100mm macro
F No: f8
Shutter Speed: 1/80 sec
ISO: 100
Exposure Compensation:  -0.33 EV
Image Stabilisation: Off