Different lens have different focal lengths, For example here are some pictures i have take with different focal lengths.
For this Photo on the left, i used the length 18mm, For this photo i had taken it very close to Emily's Face, however for the photo on the right i stepped back and zoomed in, i used the length 55mm, For the photo on the left it makes Emily's face seem longer and wider, this also gets every bit of detail, on the other hand, the photo on the right makes doesn't make Emily's face look long and wide, but doesn't catch every bit of detail. When taking a photo at 18mm it captures a wider and longer photo, On the other hand if you use 55mm it makes the photo less wider than the 18mm. The further away the picture the better picture you will have. i could use a low focal length to capture landscapes, Or i could use a higher focal length for things such as portraits and wildlife, because the further away you are the better the photo looks, however if your closer this can make things look bigger and wider than they are.
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