(faster shutter speed / less light). Aperture (or f-stop) refers to the size of the opening in the lens of the camera when a picture is taken. As you are focusing the camera, the lens is wide open with the largest aperture supported by your lens.
The harvest season typically falls between August & October in the Northern Hemisphere and February & April in the Southern Hemisphere. With various climate conditions, grape varieties, and wine styles the harvesting of grapes could happen in every month of the calendar year somewhere in the world. In the New World it is often referred to as the crush.
Other Indicators of Ripeness. The most reliable way to tell if grapes are ripe is to taste them for sweetness. Size and appearance also indicate maturity. As grapes ripen, their color changes from green to red, blue, white or purple. The grapes may develop a characteristic white bloom, which looks like a light powdery coating. They become large and slightly less firm. The seeds of table grapes turn from green to brown.