Many photographers love the soft, even light of cloudy days. These images have a blue tone and are slightly brighter. This type of natural light is suitable for all images including models or products with muted colors. Sunny days have strong, direct light that can create heavy shadows. However, when done properly, this type of natural light can be quite powerful. Ideal for wide, distant images or close-up photos of products with different patterns or textures.
The hole is the size of the lens in your camera that allows for different amounts of light. Entrance is measured by f-stops. When the f-stop is high, the hole size becomes smaller and less light enters the camera. High f-stop will lead to images where the focus is more (think Ansel Adams). A lower f-stop means less focus which may be more important to your product.
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Lock speed means the length of time your camera cover stays open when taking a picture. Fast shutter speeds can move "snow" at the same time without blurring. Slow shutter speeds do the opposite - often leading to deliberately (and artistically) blurry images. You can have a shutdown speed as fast as 1/10 of a second, or slow down as few seconds depending on what you want to look like.
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