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25 votes

How can I get headshot portraits with pleasing, natural perspective if I'm constrained to a short distance?

There is no hardware solution, short of some crazy* arrangement of mirrors to extend the actual optical distance. That's because perspective distortion solely related to distance, but there might be a ...
mattdm's user avatar
  • 143k
23 votes

Is it normal for RAW files to have lens distortion? How best to deal with it?

Is this normal for RAW images? Yes, it is normal. Based on my experience with Canon cameras with different lenses, the RAW image remains uncorrected w.r.t. to the corresponding JPEG. This means that ...
Saaru Lindestøkke's user avatar
17 votes

How do cameras undistort photos?

Distortion is produced by the lens, not the sensor. So the distortion correction you describe is also referred to as lens correction. There are different distortion models (equations). The ...
xiota's user avatar
  • 27k
15 votes

How do I get rid of distortion in pictures of distant objects photographed with a telephoto lens?

Shoot early in day to avoid heat waves. Or shoot from elevated position.
Ross Duggan's user avatar
14 votes

What is the farthest a camera can see?

If you simply want visual examples with commonly available lenses and resolutions the webpage: "Guide to Identifying or Recognizing a Face: Resolution, Focal length, and Megapixels" has a number of ...
Rob's user avatar
  • 1,823
13 votes

Why do people care about vignetting or distortion?

Those have completely different impact. Vignetting Vignetting is a darkening of the corners or edges which depends on aperture and focal-length. In order to correct this in software, pixels around ...
Itai's user avatar
  • 103k
13 votes
Accepted

Why do people care about vignetting or distortion?

There are three major considerations that make lenses with less distortion, vignetting, or any other "correctable" aberrations more desirable for many photographers than correcting later in ...
Michael C's user avatar
  • 175k
12 votes
Accepted

What is the difference between perspective distortion and barrel or pincushion distortion?

Perspective is determined by the position of the camera relative to the scene. When a camera position produces a perspective that makes an object or scene look different than we might expect it to ...
Michael C's user avatar
  • 175k
12 votes

How can I get headshot portraits with pleasing, natural perspective if I'm constrained to a short distance?

Classic standards have always been more like 2 meters Minimum distance for portraits. 3 meters is common in professional studios, for even better perspective. Too little distance (like 1 meter) will ...
WayneF's user avatar
  • 12.9k
9 votes

What makes these white stars appear black?

The stars aren't black; the spaces between them are. (or rather, dark blue) The brighter bits between that dark ones are the defocussed stars. Due to the defocussing, they have grown in apparent size,...
ths's user avatar
  • 7,171
9 votes
Accepted

How do I get rid of distortion in pictures of distant objects photographed with a telephoto lens?

This distortion is due to the sun shining on the water. The sun's heat warms the surface causing warm air to rise. Likely some water vapor mixed in. What happens is, different layers of different ...
Alan Marcus's user avatar
  • 39.3k
8 votes
Accepted

Lens correction in darktable when my lens isn't known?

Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for. The following is a dirty hack that may be ...
junkyardsparkle's user avatar
8 votes
Accepted

How does camera firmware obtain lens distortion correction parameters?

Micro Four Thirds (MFT) is a vendor-neutral platform that standardizes the information communicated between camera and lens. Lenses can inform the attached camera body some of their chromatic ...
scottbb's user avatar
  • 32.9k
7 votes

Focal length on Full frames and cropped sensors

If you take a photo of a FF camera and 75mm DX lens and compare that image with another shot of same subject made by a cropped camera and a 50mm lens what you will see ? But to be able to see the "...
WayneF's user avatar
  • 12.9k
7 votes
Accepted

How is focal length facial distortion different on an APS-C sensor compared to a full frame?

The facial deformations you are worried about are due to perspective distortion. Perspective is determined by one thing and one thing only: subject distance. Here's an example of focal length ...
Michael C's user avatar
  • 175k
7 votes

In photo taken with a prime lens, what is the cause of the "zoomed" bokeh appearance?

This is just an educated guess that I've never tested or seen specifically tested with lenses that have been highly corrected for field curvature and astigmatism, which are intimately related. Most ...
Michael C's user avatar
  • 175k
7 votes

Why is the person in the corner of this photo distorted?

It's a typical result of rectilinear projection with a very wide angle lens. It's compounded by the hand being much closer, relatively, than the face to the camera.
Michael C's user avatar
  • 175k
7 votes

Is it normal for RAW files to have lens distortion? How best to deal with it?

Yes, this is normal. The raw file contains just the raw data from the sensor, with no processing of any sort done (plus metadata, previews, etc). The embedded previews and the JPG produced when you ...
twalberg's user avatar
  • 5,148
6 votes
Accepted

How to un-spherize an image using Photoshop?

Pradeep Sekar was in the right direction but is probably using an old version of Photoshop. Using Photoshop CC, here comes a step-by-step solution : Open your sphere image in Photoshop. Here an ...
Olivier's user avatar
  • 4,193
6 votes

Is there a difference between increasing focal length vs. cropping?

From an idealized perspective, cropping and enlarging is functionally identical to zooming. In reality, of course, you lose pixels, and you probably lose real resolution as well since you are ...
mattdm's user avatar
  • 143k
6 votes

How do i take a photo of an object perfectly vertical like a top view?

In order to get an orthographic view of your subject using a camera, you would need a telecentric lens. One requirement for a telecentric lens is that the width of the lens be at least as large as the ...
Michael C's user avatar
  • 175k
6 votes
Accepted

Why do I get converging vertical lines even when using a normal perspective lens?

The source of the distortion is the camera’s viewpoint. A combination of subject distance and the angle-of-view, delivered by the chosen focal length of the lens, produced the distortion. Your ...
Alan Marcus's user avatar
  • 39.3k
6 votes

Distortion towards the edges/corners of the field of view in an image

This is perspective distortion, and it is an inevitable outcome of projecting a three-d world onto a flat surface. See What is the difference between perspective distortion and barrel or pincushion ...
mattdm's user avatar
  • 143k
6 votes

Photography tricks for widening objects or reducing narrowness?

What you are describing is the effect of perspective, which ultimately comes down to distance. Regardless of sensor size or lens focal length, perspective is determined by the distance between the ...
ReverseBias's user avatar
5 votes

Why do I get converging vertical lines even when using a normal perspective lens?

Normal perspective still includes... perspective. If you point your camera upwards to focus on a really tall chimney you would find a vanishing point. If your camera is parallel to the chimney you ...
Rafael's user avatar
  • 25k
5 votes

How do i take a photo of an object perfectly vertical like a top view?

That's not distortion. Your lens simply isn't directly over the handle. The camera can't be directly over every point on the sword, so you will always have this issue to a degree. The best thing I ...
MikeW's user avatar
  • 33.4k
5 votes

Why don't smartphone cameras correct pincushion distortion automatically?

What you are describing are fundamental phenomena. The first phenomena illustrated with photograph of a ball and partially with a group photograph of people is resulting from incorrect viewing of the ...
Euri Pinhollow's user avatar
5 votes

What is the reason for a ripple effect on photos taken from a helicopter?

It looks like the rolling shutter interacting with the vibrations. It could be scanning horizontally, and the vibration comes in pulses. You could see it in a Big-Small-Big-Small pattern, from left to ...
Calyth's user avatar
  • 812

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