# Questions tagged [subject-distance]

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### How do I determine distance to an object when I know the object's size and the camera's angle of view?

I'm trying to find the distance of an object, where the original size of the object is known. Unfortunately, I cannot seem to find either focal length or sensor size online, but I know that the camera ...
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126 views

### What would be the optimal distance of the object from the lense given the camera spec

I am not a photography expert hence i would like for some advice. The camera im using is a small camera that will be taking pictures of an object at a fixed point, my problem is identifying where this ...
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### Determining the Flash to Subject Distance with an Olympus FC-WR

I have an Olympus FC-WR commander and an FL-700WR flash. The flash will show me the flash to subject distance when it's in the hot shoe, but not when I'm using wireless mode with the FC-WR. Is there ...
1 vote
3k views

### Calculating the size of an object from a single image, given the distance from the camera

I was looking at other questions on here and I'm pretty sure it's not a duplicate so here it goes. I'm working on a problem where I need to calculate the size of a particular object in an image. The ...
201 views

### Subjects not focused when they are too far away

I recently bought a Nikkor 200-500 f/5.6 lens. I've been trying it out with several kinds of subjects and results have been a little mixed. When the subjects are close the focus is sharp. This bird ...
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### What does pixel width mean in the context of calculating camera placement distance?

I am setting up cameras for an experiment filming animals. In a experimental protocol paper that I'm following, it states that: Based on a pinhole camera model, the bound x_min on the pixel span of ...
585 views

### Is x50 zoom camera able to zoom 500 meter target area from a 6 km distance?

I have a x50 zoom camera and here is some specs of the camera and lens: Focal length: 6 mm ~ 300 mm Field of view: 58.4° ~ 1.4° Resolution: 2 MP I drew a scheme to explain my question properly, you ...
186 views

### Would an MFT to EF speedbooster on an MFT camera help me photograph and record backyard wildlife?

Upon learning that an Olympus 12-200mm with a 16.6x zoom will not be produce an equivalent or better zoom range as a Canon 70-300mm (see my previous question), I now pose the question: Would it make ...
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### Physical Distances at the edge of a photo compared to the center

If I take a photo with a camera facing straight down onto a flat surface (no tilt), will 1 cm of the surface be represented by the same number of pixels at both the edge of the camera and the center ...
1k views

### How to get someone razor-sharp from head to toe from a distance of 12 feet (3-4 meter)?

I have tried several apertures, but I still can't get the entire body of the subject to be super-sharp. When the subject extends the arms, I find the hands to be less sharp than the eyes. I'm using a ...
1 vote
1k views

### Can we calculate object distances by changing camera position and "measuring" pixel sizes of objects [closed]

I am not sure if this is a telemetry question or simple geometry but came across to similar questions in this forum, but I think this is a bit different; and actually "simpler" (compared to "autofocus"...
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### Why do you need to change your position rather than just focal length to affect perspective?

Why must you change your distance from an object to change your perspective of it? Why is it not sufficient to change the focal length of your lens (the zoom level) to change your perspective?
1 vote
953 views

### DOF change when keeping subject size same in the frame

What I have heard is you get more background blur (narrow DoF) with lenses with longer focal lengths. And another thing to get narrow DOF is the distance between the subject and the sensor, the lesser ...
• 153
2k views

### How to determine film size from smartphone image exif data?

I took an image from my phone and got its exif data below. It was a samsung note 4, which uses a 35mm film size (24x36) with a 43.27 diagonal. But what I am trying to figure out is the sensor diagonal ...
• 111
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### Calculation for getting dimension of object in image not working

I am trying to calculate the dimensions of an object in an image. This is a sample image I took to get height of blue shirt: I am following the math from this page with sastanin's answer to How do I ...
• 111
7k views

### Converting FOV to Distance?

I have a camera with CS mount and I am now trying to figure out the best fixed-lens to buy so that my camera can see the object at a distance of 5" without the object looking like a tiny dot, it is ...
• 103
3k views

### What lens will let me take a photo of a bird high up in a tree?

What lens would work for a canon 6D to take up close photos of birds far away in the trees? My Canon 100mm-400mm lens just doesn't get that close.
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14k views

### Is there a difference between taking a far shot on a 50mm lens and a close shot on a 35mm lens?

I am looking for a prime lens to pick up, and I'm wondering if there is any difference between 35mm and 50mm in terms of the end product if I just stand back more with the 50mm. I use the Sony a6000 ...
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3k views

### Setup for taking photos of large flat surfaces (maps/plans/textiles) at limited distance

My Problem ist actually simple: I am trying to take photos of flat surface items (large flags, large maps, antique rugs and so on) in a room that does not offer enough height. I have been "...
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1 vote
8k views

### Is it possible to calculate the distance to an object using two pictures taken a few cm apart?

Is it possible to calculate the distance of an object to the camera with two pictures which are taken a few cm apart? We are able to estimate the distance with our eyes. But is it possible to do it ...
1k views

### What kind of lens to use to get sharp images of people from a distance?

I am looking to buy a new lens and want something that will produce sharp images of people from a distance. I currently have a 50mm prime lens and my close-up portraits are great - crisp and clear - ...
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488 views

### I have camera specifications but don't know the actual focal length

I'm trying to figure out the focal length of my camera. I'm trying to figure out the distance from my camera to an object using the equation listed here (How do I calculate the distance of an object ...
1 vote
143 views

### How can I determine the distance to a subject in a old photo with little other information?

My question is similar to this one, but I don't know how accurate the formula will work with old photos. If I assume that the runners would be 1m80 (5'11"), would it possible to estimate how far ...
• 11
184 views

### How do I measure the distance from an object to fit it in the screen? [duplicate]

I'm curious if there is any math formula for this. Let's take a close-up of a human face for instance, given the human face is about 20cm/8 inches, how do I choose the right focal length and from ...
• 11
907 views

### Is the distance scale on a lens linear?

I have Nikon lenses with distance scales on them so I can set the lenses to the hyperfocal distance when I need. Say now the focal length is 28mm and the aperture is f/16. The corresponding ...
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3k views

### At what distance from the lens will the image be in focus given a subject distance and focal length? [closed]

I've been trying to figure this one out for more than an hour now and I have no idea how to calculate this... You capture a picture of a tree which is standing 3m away from the camera. The focal ...
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19k views

### What is ideal distance to subject for head and shoulder portraits?

Perspective is a matter of distance and has an effect on facial features and the observed three-dimensional feeling in a two-dimensional photograph. Proper lighting is a big part of this, but that's ...
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1 vote
6k views

### 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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1k views

### How do I calculate what the working distance will be with a macro reversed lens setup?

Once I got hooked up on macro photography and bought a 105mm 1:1 macro lens. I really like the lens and it also gives me a decent working distance. However, I started being obsessed with getting ...
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