Basics Of Photography - Free Digital Photography Book
A camera lens hood is a cylindrical piece of plastic, rubber, or metal that fixs over your lens to prevent light from shining straight into it. The hood may screw onto the front of the lens or some hoods are linked to the lens and can slide out like a sleeve.
Initially when I first got my DSLR camera I had no clue what a lens hood was. I bought my camera used from a friend. It came with two lenses. One of the lenses had a hood. I do not ever used the lens hood in the beginning. Yes, I had a film SLR camera when I was younger and I should've known what a camera lens hood was, but I don't ever used one hood then either. One day I made a decision to use the hood to see if it made a difference and it did. Now I use my camera lens hood regularly.
Hoods can come in a range of shapes and lengths. They are normally cylindrical, but they can also be square. The edge of the hood can be straight or flowered. Flowering of the edge should help prevent vignetting when the hood is on correctly. Hoods are made for each type of lens. Make sure you use the hood which was made to be used with your lens. If you use a different hood you might get troubles, like vignetting.
Digital Photography Basic principles - Improve Your Pictures
Lens hoods reduce the shapes and streaks of color which bright light might cause in your photograph called lens flare. But that's not the only thing a hood may do.
Using a lens may also help make the colors in your photos look richer. It helps prevent you from getting blown-out pictures.
If you wish to use flare as a creative effect in your photograph you will not use a hood, certainly.
Digital Photography Principles - Protect Your Lens
Because the hood stands apart from the front of the lens the way it does it may aid protect your lens from damage. That's not the purpose of a hood, but it can work as added protection to prevent things coming in contact with the glass at the front of the lens.
It can also protect your lens from getting dust or water on the front element.
Digital Photography Basic principles - Possible Problems with Lens Hoods
Often hoods can cause difficulties with your pictures. If your hood is too large it may block your camera's built-in flash. If that's happening you'll notice that your photo is darker at the bottom.
Often you may notice vignetting when you use a specific lens hood. This all depends upon the lens your using and the size of hood. Lenses with a wider field of view can't use longer hoods. If you use a hood made for the specific lens your using, you would not have this issue.
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