The photography-calculations tag has no wiki summary.
7
votes
3answers
320 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 ...
6
votes
1answer
809 views
How can I calculate the change an extension tube makes to the maximum magnification of a lens? [duplicate]
Possible Duplicate:
How can I calculate what the effect of an extension tube will be?
My understanding is that extension tubes increase the magnification of lenses by reducing their minimum ...
3
votes
2answers
539 views
Can we measure size of an object using EXIF data from a photo?
A lot of people have asked if we can measure the distance of an object in photo. But I was wondering if we can measure the size of an object in photo. Of course assuming we know everything from sensor ...
2
votes
2answers
249 views
Why does EV increase as ISO increases?
From what I understand, the lower the EV value, the more exposed (bright) the image is.
EV decreases as aperture decreases. More light gets in with lower apertures.
EV decreases as shutter speed ...
2
votes
3answers
419 views
Is there a linear relationship between shutter speed and speed of subject to freeze motion?
Is there a calculation that I can do that will calculate the required shutter speed if I know the speed of my subject and want to get a crisp image e.g. freeze motion?
For example if I go to a car ...
2
votes
3answers
2k views
Calculate object size when I have physical pixel size
How do I calculate the object size when I have
focal length = 25mm
distance to object = 700mm
CCDs pixel size = 4,4µm ?
My camera is this one.
Appreciated!
Edit: Could this work:
real height ...
1
vote
1answer
165 views
How does the depth of field with 50mm f/1.4 compare to 85mm f/1.8 with the same framing? [duplicate]
Possible Duplicate:
Is there a formula to calculate DOF?
Is there an easy way to establish, on paper, which of these two lenses, shot wide open and with the same subject size in frame, ...
1
vote
3answers
215 views
How to get focal length from a camera specification which gives a value like “4.5-22.5”?
I am using a Sony W520 camera. The specifications mention
Focal Length (f= mm) 4.5-22.5. What number should I take? The lower value or the higher? And if not both of them, then how to calculate actual ...
0
votes
1answer
177 views
Where can I find photos taken by a calibrated camera to make a 360° panorama? [closed]
I am trying to write up an automatic 360° panorama stitching program for my final project, in order to do so, I need to accomplish four steps:
Find the horizontal and vertical field of view for a ...
0
votes
1answer
68 views
How to automatically measure subject dimensions (width/height/distance) without physically measuring?
What methods are used for automatically measuring the dimensions (width/height/distance/etc.) of a subject without having to get in there with a measuring tape?
I am just starting to get into ...
-1
votes
1answer
369 views
How to calculate object's height in pixels from an image? [duplicate]
Possible Duplicate:
Calculate object size when I have physical pixel size
I am working on the following formula to calculate distance of object from camera:
distance to object (mm) = ...
