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### Calculation of Distance of an object given the field of view of camera [duplicate]

I am using an Olympus M. Zuiko 45mm f/1.8 Camera, I have to calculate the distance at which the lens should be present so that it captures the complete object at once. I know that the field of view ...
408 views

### What focal length and quality of lens do I need to read 15cm high text at 500m away? [duplicate]

I have to photograph 15cm high printed text from 500 meters away. The text has to be human readable in the result. What kind of focal length do I need? Can i compromise, and get a camera with less ...
2k views

### How much zoom is needed for a distance of 600 ft? [duplicate]

How much zoom is needed for a distance of 600ft?
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### Apparent size and field of view [duplicate]

i am sure there is a simple answer, but i have seem to have forgen it. How do you calculate the relative apparent size of the subject i have seen a formula with the field of view and tangent, but i ...
93 views

### Understanding Lenses and the Focal length and Distance of Shooting [duplicate]

Suppose i want to make a Picture of a Tiger,in the National park or in wild life safari,and to fill in the Frame with my Aps-c Eos Camera with Focal Length at 300mm,how close or far i need to ...
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### Choosing lens for a studio to record classes [duplicate]

I'm building a home studio to record Math classes: I have a blackboard (1,90m width by 1,20m height) and the distance from the camera to the blackboard would be around 1,80m (on a tripod, 1,70m from ...
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### What size lens do I need? [duplicate]

What size lens do I need? I am shooting video from a distance of about 10 to 11 feet away. I want to be able to go from a CU (top of head to mid-chest) to a full body shot (head to toe). I currently ...
1k views

### How can I explain focal length to someone who isn't into photography?

Context So my friends and family are curious about how far my lens can reach. I usually explain with focal length and show them a few pictures. Question Is there any easier way to explain what ...
1k views

### What kind of lens is used in this picture of Earth?

The photos in an answer to this question show the Earth as very small as seen from the moon. I suspect that the lens used doesn't reflect how our eyes would see the Earth from the moon. Is there a way ...
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### How do I convert focal length to maximum distance?

I would like to know whether there is any relation between focal length and distance. For example, what is the max distance I can shoot from a 55mm-300mm lens?
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### How far away can I be and still get a sharp subject with a 100mm lens?

If I have a 100mm lens, how far away can I shoot the subject? If I am shooting basketball, how far can I shoot the subject and still get a sharp picture?
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### What does “angle of view equivalent to that of some lens in 35mm format” mean?

Does "angle of view equivalent to that of 22.5-585 mm lens in 35mm [135] format" for a digital camera mean that the lens is equivalent to a 22.5-585 mm lens for a DSLR camera?