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Questions tagged [distortion]

a lens defect which causes straight lines to be curved or bowed

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0answers
86 views

Crystal Ball Photography Distortion

I am doing a photography project that is related to Crystal Ball Refraction Photography. I want to be able to reverse the distortion caused by the crystal ball using Photoshop or some other software ...
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1answer
54 views

Does the DJI Phantom 4 advanced has the fisheye effect on taking videos from above?

I make research on transportation systems. I'm going to use a Dji Phantom 4 Advanced in order to take videos from above and then I will georeference multiple frames. Should I take into account the ''...
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3answers
179 views

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

This image was taken with a Vivitar 24/2 (Kiron) prime lens. The lens is sharp. The focal plane is reasonably flat, and there is barrel distortion. The bokeh balls have an oval shape in which the ...
3
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3answers
140 views

How to reduce landscape curvature?

My camera is a Nikon D610 which I used with a Sigma 12-24 wide angle lens. Can anyone recommend a software product to straighten up horizons with? I have attached an example where I have a curved lake ...
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0answers
38 views

Were there ways to deal with distortion in the darkroom ages? [duplicate]

When people used early ultrawide angle lenses that had visible distortion, did they simply accept the fact and print it too ... or were there mitigations for things like critical architecture ...
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2answers
861 views

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

I took some raw (CR2) photos with the Canon Powershot G5 X and want to edit them in darktable. The focal length is quite low and the distortion high. My Problem: I want to correct the distortion and ...
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4answers
293 views

Distance-creating “lens”?

On another recent question I noted that it's theoretically possible to take "short-range" pictures that have the perspective as if they were taken at a distance, by means of a system of mirrors: To ...
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2answers
3k views

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

I know in a portrait photo we use distance between camera and the subject in such a way as to create a pleasing and hopefully natural-looking perspective. I think it's good on 1 ~ 1.5 meter to get a ...
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1answer
153 views

Will a clip-on zoom lens correct the distortion of a wide-angled smartphone lens?

My friend wants to shoot a vlog style series and she doesn't currently own a DSLR, so she was going to shoot with her smartphone. I am aware of the natural distortion of features (noses, foreheads, ...
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5answers
2k views

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

From my understanding (and research) focal length affects how a face will end up looking on a photograph. Here's an example of focal length distortion on a full-frame sensor: My question is: will a ...
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2answers
111 views

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

I am taking a picture keeping the camera horizontally in landscape mode from a height of roughly 3-4 ft, acquiring the top-view of the scene. It was seen that the objects placed towards the centre of ...
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1answer
62 views

What is the cause of this speed-dependent distortion? [duplicate]

I took this shot using a Sony Xperia SP with OpenCamera, here are some details: Exposure: 1/800 ISO: 50 Aperture: f/2.4 focal length: 3.0 The photo was taken out of a train, at around 160km/h, the ...
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1answer
503 views

How to measure field-of-view of a camera with fisheye Lens? [duplicate]

For a camera with a rectilinear lens a simple measurement would consist of taking images from known distance of an object of known size. For example using a sheet of paper as an object set on a wall ...
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1answer
98 views

How to fix the phenomena where photos add 5 / 10 lbs or kgs to your face? [duplicate]

So, they say that photographs make you look a little heavier or fatter by 5 to 10 lbs or kgs. It does appear to be true as most of my photographs make my face look "fuller / rounder" than as it is ...
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4answers
506 views

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

I took a trip on a helicopter and took many pictures with my iPhone 6 plus. One of the images was distorted with a sort of wavy ripple blur effect (other images did not exhibit the same distortion): ...
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4answers
187 views

Why do the spokes bend in this photo?

This is obviously a high frame rate photo of a very close cycling race finish. What gets me is not the closeness of the race (although the closest I've ever seen). Rather, it's how the spokes appear ...
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3answers
489 views

What is the origin of the hexagonal artifact of direct sunlight/spotlight photos?

Sometimes direct sunlight or spotlight appears hexagonal on photos/videos. What is the origin of this artifact? (source)
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0answers
158 views

How to determine the projection (Stereographic, equidistant etc.) of my fisheye lens?

I have a Fujinon FE185C057HA fisheye lens and I want to know its projection. Is there a software tool I can use to do this? I have the lens with me so I can take some pictures with it. I just need a ...
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6answers
1k views

How can I keep lines straight when taking photos of my artwork for printing reproduction?

How to take photos of my artwork for printing reproduction? I have a Canon EOS 700D and cannot seem to get them 'straight'; they always seem askew?
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1answer
161 views

Bendy distortion of straight lines in infinite mirror

I was in one of those mirror mazes where they have massive mirrors in a maze structure. However, these mirrors were lined with LED light strips, which were straight, because they were on the edge of ...
2
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3answers
714 views

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

Other than the difference in the quality of the image (increased focal length will produce more quality than the equivalent cropping of the image), is there a difference? For example, if I increase ...
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1answer
477 views

How can I convert RAW files with proper distortion correction from the command-line?

I'm close to fully automating a process of stacking bursts of pictures into one image thanks to Hugin's command-line tools, however there's one part I can't automate yet, it's converting RAW into ...
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4answers
836 views

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

I'm creating a set up that allows me to take photos of any object to capture its outlines for computer controlled cutouts. I'm no photography expert :D. I use a 60 x 60cm LED Light panel to ...
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2answers
16k views

Why does my forehead look big in pictures vs. reality? [closed]

My forehead in reality is small—normal. Everyone I ask tells me it is normal, not big. In photos it seems too big—not even normal. I am a man. My hairstyle doesn't hide the forehead, it is up. Why in ...
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4answers
946 views

Does distortion change with focus?

I'm interested in writing some software to eventually replace the current photogrammetry system I use at work. Distortion correction (among other calibrations) is an important factor in getting high ...
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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 ...
3
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3answers
445 views

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

was shot with a Mamiya 645E with a 80mm lens. I'm surprised at the lack of parallelism of vertical elements. I was pointing up at a diagonal to avoid a fence; is that all there is to it?
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2answers
224 views

Can lens correction help distortion caused by getting too close for headshots?

I am using a Nikon 50mm 1.8D, but with an APS-C on a D7200, it gives me 75mm focal length. It's as sharp as a $700 85mm lens, and I paid $135 brand new for it. I am currently using this setup for ...
17
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4answers
3k views

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

I've heard of: perspective distortion barrel distortion pincushion distortion mustache distortion What are these different types of distortion, and how do they relate? What causes them, and can they ...
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5answers
551 views

Focal length on Full frames and cropped sensors

Yes, this subject again. But I have a slightly different question and I was unable to find an answer here or anywhere else. I understand a 50mm lens is a 50mm lens ALWAYS. I understand that "...
1
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0answers
381 views

Where can I find Adobe Lens Correction Profile (.lcp) files for RawTherapee?

The latest versions of RawTherapee can apply corrections from Adobe Lens Correction Profile (.lcp) files, but where can these be found? I've tried Adobe's Lens Profile Downloader, but it doesn't list ...
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2answers
93 views

Is it possible to process a number of very long range photos into one undistorted image?

After seeing this question I couldn't help but wonder if it's possible to take some (possibly very large) number of photos of a very far away object (several kilometers) distorted by atmospheric ...
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0answers
107 views

How to correct HDR post-processing artifacts in a series of exposures

I have taken several series of frames that I intend to process into timelapse sequence. Some were taken using a smartphone camera in HDR mode. Due to the post-processing that happens in the device, ...
2
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0answers
86 views

Software to re-center a fisheye image

I am looking for easy to use software that works on OS X and can "re-center" an equal-area projection fisheye image. What do I mean by "re-center"? The perspective correction tools built into many ...
2
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2answers
2k views

How to un-spherize an image using Photoshop?

Assume I have a traditional panorama. I use a spherize technique (e.g., in Photoshop) to produce a spherical image. Some time later, I want to take the spherical image and get back the landscape (...
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2answers
276 views

How does lateral chromatic aberration correction without a lens profile work?

Many different software (including Lightroom) can correct lateral chromatic aberration without having a special profile for the lens. How is the correction done? Adobe's method for doing it when a ...
3
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1answer
182 views

How is a lens distortion model performed? [duplicate]

So, as the title suggests, how is a lens distortion model (e.g. Brown-Conrady or pinhole camera model) applied on an image? I know it uses some calibration parameters (principal point's coords,focal ...
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2answers
2k views

Why do people care about vignetting or distortion?

On every lens review there is distortion (on wide angle ones) and amount of vignetting mentioned. I would like to know why, when it is so easy to edit in post processing.
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4answers
754 views

Categorization of 14mm lens as rectilinear?

I used the Panasonic Lumix G Vario 14-42mm f/3.5 -5.6 Asph. / MEGA O.I.S. Lens to take a photo from my balcony. Here's the original RAW (ORF). The symptom I am experiencing is that different ...
2
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3answers
277 views

LightRoom: Any way to get the 'Distortion' effect (far) over 100? Why is it limited?

When I process pictures in LightRoom (newest, CC 2015.4), I often would like to move the sliders over the maximum (or under the minimum) offered. This question is specifically about the 'Distortion', ...
2
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3answers
2k views

Do the DJI Phantom 3 & 4 produce the same amount of fish-eye as previous Phantoms?

I'm wondering if the generation 3 and 4 of the DJI Phantom are still producing the same fish-eye effect on photography as the Phantom vision 2.
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2answers
231 views

Is lens stacking/reversing correction possible?

It happened that I shot a some photos in the "Macro/Micro field" by using both: Stacked lens technique Reverse-lens technique Assuming I wanted to correct lens distortion and chromatic aberration ...
3
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4answers
447 views

Do the out of focus elements in this photo look normal?

I just shot this picture with my Canon T5i (75-300mm) lens. I zoomed from a distance to take this picture. As you can see, the focused area looks normal, but the grass that is out of focus looks ...
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2answers
354 views

Distortion Removal=Parallax Removal?

So, as the title suggests: does distortion removal caused by lenses means that the parallax is also removed from the pictures?
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2answers
887 views

What model does Lightroom use for lens correction?

I use Adobe Lightroom to remove the barrel distortion from GoPro images. Does anyone know if this software uses the Brown-Conrady model to achieve the lens correction? If not which model does it use? ...
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4answers
577 views

Does aperture effect the “depth” of faces in a portrait? Wide aperture make noses look shorter, wrinkles less pronounced?

Having a debate with myself that F/10 makes my portraits look better by making faces have less "depth." What I mean is I feel like wider apertures such as f/4 make my nose look longer and wrinkles ...
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6answers
220 views

What kind of lens do I need to get more of the scene into the frame?

I apologize for my lack of photography terminology. I am a beginner who enjoys taking pictures of my infant, and I would like to improve greatly. With the winter here and doing all my pictures ...
2
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4answers
5k views

Why don't smartphone cameras correct pincushion distortion automatically?

I've previously asked why the GoPro doesn't automatically correct for the fisheye distortion, and this question is related, but different: Given that smartphones have so much processing power ...
1
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2answers
630 views

Normal lens on cropped sensor camera and distortion [duplicate]

I'm a novice on photography, so I hope I can explain myself clearly. I have a Nikon D5100 (cropped DX sensor) with kit lens, 18-55mm. I'd like to buy a normal prime lens, getting faster shutter speeds,...
1
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1answer
131 views

If a lens has a 4% Barrel Distortion, what does that mean for images?

I know what barrel distortion is, but how do I take a 4% rating and relate that to an image?