These are extrusions of silk that may allow the spider to tension the web in order to feel minor vibrations. Males may hide at a corner, running out only when food is sensed. The spider will likely only hang upside-down in the web. A 90 mm or longer lens is helpful. I use a 180 mm macro lens, sharply corrected for close-up at long working distances.
Early morning is often the best for photography.
Dew drops may still be present if the night was wet, and the light will be warm. Just after sunup the web sill be at its freshest. This web material is recycled by scooping the old spirals into the center at night, then ingesting the silk again. Within a few minutes, the protein components will be ready to re-secrete. This will allow closing down the lens to increase depth of field.