(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.
Then, squeeze your juice into a cup. Use the juice to make your measurements, and then write down your results. Enjoy picking your grapes, then measure a sample for sugar, acidity and pH and record it. Then, sort through your grapes. Pick out any green, moldy or shriveled berries and you're ready to start making wine.