What is Focal Length in Lenses | Focal Length Comparison

look at this picture now this one they both seem to be taken from the same distance but one is a great picture with great separation of subject and the other one is a great abomination of mankind so what is up with this disparity well the obvious answer is that these two pictures were not taken by the same lens so the question we have to answer is that what is the difference between these two lenses first thing we need to talk about is focal length one of the cool things about focal length is that while it is a very simple concept it would make you look really smart when talking about it the basic description of focal length is the distance between camera sensor and the location inside the lens where the light comes together to form the image this distance is measured in millimeters the lower number means that the lens is closer to the camera sensor this will generate a wider image and that’s why the lenses in this range are generally known as wide-angle lenses wider images are great four times when you want to include a large area into one picture or when you are in the cramped location and can’t get far enough from your subject shorter focal lengths will also result in increased depth of field what that means is that more of the image will stay in focus the other plus point for wide lenses is the stability of the image since the lens is covering a large area it is more forgiving when it comes to shaky hands so all these have made wide-angle lenses the first choice for artists who want to capture a huge scene into one image like nature photographers who want to take picture of vast plains and mountains on the other side of the spectrum we have higher focal lengths which means a narrower field of view the lenses in this range are generally known as telephoto lenses telephoto lenses are great for pictures when you want to attract the attention of the viewer toward your subject they are also great for nature photography where the subject is either too far like a bird or they are too scary to get close to like a tiger the other thing that will greatly help turning the attention toward the subject is the bokeh effect what happens here is that the higher focal length will result in shallower depth of field so when you put your subject in focus the rest of the image is out of focus and blurry phone manufacturers add this effect artificially in software and call it portrait mode so it is obvious that this focal range is amazing for portrait shots between these two ranges there exists a middle ground between 40 to 58 millimeters which is generally known as medium range this focal range is the closest to the natural way human eye sees the world medium range lenses are generally between 35 to 80 but the best and most used range is 35 to 45 videographers really like to use these lenses especially when the story they are telling is about normal everyday life documentaries are also a great use case for medium range lenses because of the natural feel they give now that’s out of the way let’s talk about the other biggest difference between lenses prime lenses and zoom lenses physical differences are obvious zoom lenses are great at you know zooming while prime lenses are fixed to one focal length this means that the lens is less flexible but has better image quality zoom lenses use more glass to work in different focal lengths and that means the image will be filtered through so many different lenses this will affect the quality of the image ever so slightly prime lenses on the other hand are working at the fixed focal lengths this means that they are using less Glass compared to zoom lenses because of that the image is less filter when it reaches the camera sensor of course this difference in quality is minimal and you may not even notice it in your footage besides the flexibility of zoom lenses is so huge that it is hard to ignore zoom lenses are great for the type of photography where everything is instant and unpredictable street photography and sports photography are examples of that in these cases you will never have the time to constantly change lenses for each situation prime lenses are great for photography in controlled environments studio shooting is a great example of that so as you can see lenses are not created equal there are so many factors like the general quality of the lens or even the weight of the lens that will affect the way you are going to use it but those are subjects for another time for now thank you for sticking to the end of the video be sure to subscribe and click the bell icon for our future videos best of luck and bye

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