The subject-distance tag has no wiki summary.
24
votes
3answers
1k 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 ...
14
votes
2answers
15k views
How do I calculate the distance of an object in a photo?
If I took a picture of a windmill on the horizon — given that I know the sensor size and the focal length of the lens and other factors to do with the shot — could I calculate how far away an object ...
9
votes
6answers
1k views
How to micro-adjust distance for focusing in macro photography?
I'd like to take macro photos, but I have a problem with the focus.
I put the object on a (light) table, I put my camera on my tripod and take a few shots. Since the depth of field is very small ...
9
votes
2answers
1k 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 ...
8
votes
3answers
558 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?
7
votes
3answers
308 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 ...
5
votes
1answer
91 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 ...
4
votes
2answers
361 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 ...
3
votes
2answers
274 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 ...
1
vote
2answers
766 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 ...
0
votes
1answer
152 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 ...
