“What is the effective focal length of the image? Is this an ultra-wide-angle camera that's going to show my belly button, or a telephoto that will provide my classmates with a view of my nostrils?”
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The Logitech website gives this camera a field of view (FoV) of 78 degrees. I know, not terribly helpful, is it? However, with a bit of that math you swore you would never need in the real world, I can tell you that for each foot of distance, it should see an area that is roughly 17.5 inches wide, and 11 inches tall. For each additional foot of distance, you add another 17.5 x 11 inches. So at 2 feet it sees 35 inches wide by 22 inches tall. To put some perspective to this, if you set a laptop on your lap (about 18 inches from your face) you can see from the top of your head to somewhere around the middle of your chest and from shoulder to shoulder. For people who use it on a monitor for their PC (about 3 feet from your face), you can see from the top of your head to the middle of your hips (if you are 5'-6" or so) and an area 6 feet wide. Sorry, I don't have a body reference for that, but its "about" the width of a normal sized couch. The Logitech C525 (also sold at best buy) has a FoV of 68 degrees which is a viewable area of 16.5 inches wide by 9.25 inches high per foot. Laptop: Top of head to upper chest and most of your shoulders. PC: Top of head to most of your upper body and 4 feet wide or twice as wide as your counter tops are deep. If you want to know how far you have to be from either of these cameras to see a specific width (Man! I wish I could include this awesome 8 foot wide painting my 2 year old did in my videos!) you can take the width (in feet) of the thing you want to see, and divide that number by 1.62 for the C615 or 1.37 for the C525. This will give the distance (again, in feet) of how far the camera has to be from the thing to see the whole width. Example: My kid's 8 foot wide painting. I take 8 and divide it by 1.62 because I have the C615 and I see I need to have the camera at least 4.94 feet from the painting. If I have the C525 instead, I take 8 and divide it by 1.37 and I find I need to be 5.84 feet away. If you don't want to (or don't know how to) figure out the feet and inches from that, just round UP to make sure you can see it.
Sorry, there was a problem. Please try again later.It defaults to a 16x9 aspect ratio. Mine sits approx 1.5 feet from my face and the camera sees my face and upper body in approx 30% of the frame.
Sorry, there was a problem. Please try again later.I can't answer for this particular camera, but if your nose is X inches from the lens and see the same amount of inches from your nose to one edge of the frame, that's 45 degrees to each side which means 90 degree angle of view. That's wide angle. Distortion is proportional to angle. It's not a defect of the camera but a consequence of projecting a 3d image onto a flat (2D) surface. Like projecting a globe to a map on a Mercator projection. For lenses, "Normal" angle is 50 to 65 degree angle of view. Mount the cam on top of your monitor, sit 24 inches away (measure to tip of nose) directly in front of it in the center of the frame. Then hold one end of a tape measure on your nose and stretch it out to the side parallel to your monitor screen. If you see to the 24 inch mark in the frame it's 2 x 45 degrees = 90. If the 19 inch mark is at the edge it's a 2 x 38 degree = 76 degree angle of view. If the ONE FOOT mark is at the edge of the frame the angle of view is 2 x 27 degrees = 54 degree angle of view. THAT is a normal lens. If you sit TWO feet from the camera, a normal lens will show ONE foot to each side of your nose to the edge of frame, which is about 6 inches beyond the shoulders of an average size person. See here, yes. I measured these and used ARCTAN of (opposite divided. by. adjacent.) Or, ARCTAN of (distance from nose to edge of frame divided by distance from nose to camera lens) to figure the angles. The calculator in Windows 10 has Trig. functions.
Sorry, there was a problem. Please try again later.Your nickname is certainly appropriate. If you want to transmit photos of those parts of your anatomy, you certainly can. I can't guarantee they will be appreciated. The images are realistic
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