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Questions tagged [subject-distance]

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3answers
92 views

Light falloff - until lens surface, focal center, or camera sensor?

Preface: if there is a better-suited forum for this question, please direct me. I figured it'd be better to post into Photography and not Physics as some of you might have already examined this ...
0
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2answers
63 views

Measure in photo formula help

Good Day I am trying to measure the width of an object in a photo as accurate as possible using the formula found in a previous question. Distance to object(mm)=f(mm) x real height(mm)x image ...
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2answers
105 views

How to accurately determine the size of a nearby object (~15cm) using the autofocus focus distance?

The problem I'm trying to determine the size of an object using the focus distance determined by the autofocus of a smartphone camera (Galaxy Note 8). But I don't seem to be able to get an accurate ...
2
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3answers
431 views

What is 'sensor height?'

The accepted answer to the question, How do I calculate the distance of an object in a photo?, refers to sensor height. What is sensor height and how do find/calculate it in this context? I'm using a ...
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2answers
235 views

In photography and videography, what is a long shot / wide shot?

I was trying to find out what a "wide shot" is. I figured it should be an industry standard term. I searched Google with various search terms like: photography what does it mean to take a wide shot ...
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5answers
1k views

Why doesn't the focus distance at which my lens has magnification 1 match the formula?

From the Wikipedia page, I have the following equality : M = di/do = f/(do-f) = (di-f)/f With M the magnification, f the focal length, do the distance from the subject to the lens and di the ...
2
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2answers
141 views

Simulating increasing image distance

I have a set of aerial images, but no information about the original camera or angular resolution of the photos. I need to in some way decrease the resolution of the images in a way that simulates ...
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5answers
242 views

Why is distance absent from the exposure triangle?

With exposure calculations, there are aperture, shutter speed, and ISO. Correspondingly, flash and light meters gives you the aperture (as an f-number) and shutter speed for a given ISO. However, ...
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1answer
48 views

Angles and distances for photogarametry

I want to photoshoot rocks which are about 20cm by 20cm by 20cm and make a 3D model of it. I am yet to find the software to create the 3D model but might use VisualSFM. Question is what angles, ...
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1answer
2k views

Calculate the distance of an object in a photo Android [duplicate]

https://photo.stackexchange.com/a/12437/61513 here is a formula for calculating distance if we know the size of the object. Can I use this method for photos/frames made by Android cameras? And if I ...
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1answer
90 views

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 ...
0
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3answers
514 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 ...
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1answer
751 views

Can we calculate object distances by changing camera position and “measuring” pixel sizes of objects

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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3answers
296 views

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?
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3answers
415 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 ...
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2answers
663 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 ...
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4answers
2k views

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. How do I ...
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3answers
4k 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 ...
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4answers
615 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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6answers
10k 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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3answers
1k 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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1answer
323 views

How to Decide Furthest Distance for Detecting Small Object with Camera? [closed]

Assume you have a 4K or 10K camera without zoom (1x). Case 1. Object width 2 cm and height 2 cm. It is 50 meter from the lens. The angle becomes << 1 so making the object invisible in the ...
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3answers
4k 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 ...
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2answers
839 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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1answer
391 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 ...
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1answer
117 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 ...
0
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1answer
154 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 ...
4
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1answer
584 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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3answers
2k 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 ...
6
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5answers
13k 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 ...
0
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3answers
4k 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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1answer
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 ...
4
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2answers
4k views

What is the image size of the Sun / Moon in the frame with a given focal length?

I'm interested in taking a picture of the Sun / Moon using a telephoto lens. For example like this. It would be very helpful for me to know what the approximate image size of the sun / moon would ...
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4answers
744 views

Can a telephoto lens have a wide field of view?

85mm-135mm lenses are great for portraits because of compression perspective distortion, meaning they flatten facial features. However at those focal lengths, you have to step back a few meters from ...
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2answers
232 views

How to take a moving object(far distance) in outdoor low light situation?

It's always been tricky to me how to take a far distance picture(moving) in a low light situation. I don't think flashlight would help in this case since it can't reach to the moving object. For ...
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3answers
1k views

What factors determine the size of focus step done with remote shooting?

When a DSLR camera is used for remote shooting, corresponding software usually provides very simple way to change focus position: small, medium and large steps forward or backward. This is how it ...
0
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2answers
94 views

Finding the point corresponding to a known height in an image

I have an image of a wall taken from a phone camera from a known height h from the ground. Assume that the camera was held perfectly parallel to the wall and that the bottom of the image is perfectly ...
10
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4answers
28k views

What is the relationship between size of object with distance?

How does the size/length of an object vary with distance? Is it a logarithmic relationship? exponential? linear? I plotted a curve of the size/length of an object for different distances from the ...
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1answer
640 views

Finding the distance of object from camera to the point of autofocus

Is it possible to find the distance to which the camera is auto focussing ? Camera auto focuses itself to view a particular plane in the real world in front of it. Is it possible to estimate the ...
5
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2answers
567 views

How can the height of a subject in picture be calculated? [duplicate]

Maybe is not the perfect stackexchange site to ask this but I try. Feel free to move or close my question, but, if you can, suggest me where I can ask this one: I took a photo with a compact digital ...
3
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3answers
2k views

Why does getting closer or zooming in decrease depth of field?

I know that aperture changes the depth of field (DOF), but why is it that by making the image appear larger (by getting closer to the camera or zooming in) there is less DOF?
5
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1answer
177 views

Using gray/white card to determine white balance, does it matter where I stand when I take reading photo?

If I want to use a white card to determine the white balance, and I'm taking a picture of something that is a short distance away from me, does it matter if I don't walk back to where I'm going to ...
0
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1answer
329 views

How to calculate distance from a subject to get the same field of view with different lenses? [duplicate]

Possible Duplicate: How much distance should one move so that a shot that can be framed at xx mm be framed at yy mm? I think the question is clear but I will provide an example. To fill the ...
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3answers
2k views

How much distance should one move so that a shot that can be framed at xx mm be framed at yy mm?

Is there a website / app that will tell you approximately how much distance a person should move so that they are able to frame the same shot at different focal lengths? Say for example, I'm using ...
4
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2answers
2k views

Why does calculated distance of an object in an image vary when zooming?

I would like to calculate the distance of an object from my camera, so i used the formula given in this question and I got a very good answer, but I've found that when I zoom and take the picture and ...
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2answers
3k views

How to measure distance to subject in Depth of Field calculator?

I used Depth of field calculator here. I should specify subject distance. How to measure distance to subject? In theory this is a distance to front principal plane or point. What is in practice? I ...
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2answers
760 views

How to calculate object size dependent on distance?

I shot some images for use in a blog post. With the closeups, I ran into the problem of too low depth of field. Because I only need them for the web, I think that the easiest way to solve it would be ...
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3answers
2k views

When a camera auto-focuses, is the current focus distance reported from the lens to the camera?

The question says it all -- does the camera "know" how far the subject is from the lens, i.e. what is the current exact focus distance set at the lens?
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3answers
9k views

What does it really mean that telephoto lenses “flatten” scenes?

This is another perspective distortion question. I understand that perspective distortion is primarily a function of capture and viewing distance, but I am still working on fully understanding the ...
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2answers
6k views

Is it possible to measure distance to an object by adjusting the focus?

This is maybe not a 100% on topic photography, but I couldn't find a better stackexchange site to post this on and maybe you guys can help me out. I have a camera that takes pictures of a production ...