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

learn more… | top users | synonyms

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0answers
19 views

ImageMagick Distort Perspective around a rectangle, without affecting aspect ratio

I have an imperfectly aligned/distorted photograph against a repeating rectangular pattern background, where one can easily identify what should be straight lines, both horizontally and vertically. I'...
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3answers
4k views

Is distortion on an iPhone primarily due to perspective or does lens distortion play a part, and what can be done about it?

I am researching how to correct any facial distortions seen on an iPhone's front camera. Here is my current understanding of the issue: close-up photos will enlarge nearer facial features such as ...
1
vote
2answers
158 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 (...
2
votes
3answers
167 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', ...
1
vote
2answers
89 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
votes
1answer
51 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 ...
11
votes
2answers
1k 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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votes
4answers
646 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 ...
0
votes
3answers
270 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.
1
vote
2answers
105 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
votes
4answers
342 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 ...
10
votes
2answers
223 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? ...
0
votes
2answers
92 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?
0
votes
6answers
134 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 ...
3
votes
3answers
3k views

Why doesn't the GoPro automatically correct for the fisheye distortion?

Automatic correction of various lens distortions is possible through specialized software that takes a few camera parameters and produces an output image free of distortion. Why don't most cameras do ...
1
vote
4answers
133 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 ...
12
votes
5answers
2k views

Photo stretched at corners?

Can anybody tell me why the heads of the two women are stretched in the corners? What is the name of this defect and how could one avoid it? I'm not a photographer (though becoming one is one of my ...
1
vote
3answers
665 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
vote
2answers
106 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,...
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vote
1answer
66 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?
2
votes
4answers
367 views

Are wide angle lenses suitable for portraiture of children?

Wide angle lens tend to make faces more "chubby" than they appear otherwise, and are therefore not used often for portraits, unless the landscape is an important part of the frame. I'm curious as to ...
3
votes
3answers
237 views

Why do drones capture images that are curved at edges?

Every photos I have seen of drones taking images at high altitudes, had a kind of curvature at the edges of the photograph. I mean, I know the earth is round. But it is also huge, and IMO, you shouldn'...
2
votes
1answer
2k views

Auto Distortion Control - do I need it?

I couldn't find anything that would explain plainly what this is, and do I need it. I have Nikon D5300, Firmware version C - 1.00, L - 2.009, and it is with the kit lens 18-55mm VR II. First, what is ...
2
votes
0answers
196 views

How to disable automatic cropping that's done after distortion correction in DxO Optics Pro 9 or 10?

DxO uses so-called "modules" that apparently contain many lens parameters and they are implicitly used for correcting geometric distortion, and some other issues in pictures automatically. But the ...
0
votes
2answers
109 views

Image manipulation software to perform 2-D mapping to a 3-D surface [closed]

Is there any software that will assist me in the distortion described in 2 below. Another way of doing this is numerical, which is likely to be labourious, error prone, and exceptionally time ...
1
vote
0answers
77 views

How do I set a lens profile for post-processing distortion correction with an inverted lens?

Recently I started having fun with macro and micro photography by inverting a lens I have (24-85mm) and by combining 2 lenses togheter (70-200mm + inverted 28mm). The results are good (I shoot in ...
0
votes
1answer
42 views

Focal length of the sony DSC-H20 [closed]

I am working in finding the distance of the objects in a video taken using a Sony Camera model DSC-H20 and suppose that any lens or zoom distortions were applied. In order to know the position I need ...
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2answers
182 views

Software to change perspective of image of a whiteboard (or some other plane) to look 2D

Let's say I have a whiteboard in a room full of people. I want to take a picture of the whiteboard but there are people in the way so I can't take a picture of the board straight on. I'll have to ...
1
vote
2answers
448 views

What causes barrel distortion?

Here are some scenarios for barrel distortion: When a target is too close to a camera, the photo will show barrel distortion. My flip cell phone's camera often produces barrel distortion. Some ...
13
votes
6answers
29k views

Why do images get “corrupted”?

I have had my Nikon D40 for a while, and some of the pictures are coming out distorted. Two examples are below: So my questions are: How do I fix them after the fact? - i.e. after they have been ...
1
vote
2answers
394 views

Which sensor “full frame” vs. APS-C (1.6 crop) gives more distortion?

Which sensor "full frame" vs. APS-C (1.6 crop) gives more distortion using the same lens? I mean, would a 10mm lens on a full frame camera show more or less distortion than if it were on an APS-C (1.6 ...
12
votes
4answers
8k views

How wide can a lens be before it begins to produce distortion?

Some lenses will produce distortion near a photo's edges (lines that should be straight begin to curve). Fisheye lenses definitely do this, and some ultra-wide lenses will do this too. I like wide ...
7
votes
4answers
709 views

Real estate photography: Low distortion lens VS high resolution lens?

Should one choose a (ultra wide) lens with the lowest possible distortion even though its resolution is not very good, over a lens that is very sharp, but has noticeable (barrel/mustache) distortion? ...
2
votes
2answers
208 views

I noticed high lens distortion with my kit lens; is this normal, and how to avoid this?

I recently bought a Sony NEX 5N with the standard 18-55mm lens kit and noticed today that it has a high lens distortion (see below). Enabling the option to suppress lens distortion in the setup did ...
2
votes
3answers
280 views

Webcam effect for Canon 5D Mark II

Is there any lens for a Canon 5D Mark II that can give the effect of a webcam? For webcam effect I mean: the subject can stay relatively close to the lens without barrel distortion large depth of ...
4
votes
5answers
3k views

Does sensor size affect lens distortion?

There was recently a video posted about how different focal lengths affect portrait photography, specifically how distortion at smaller focal lengths have more distortion and are less flattering. So ...
1
vote
1answer
3k views

How can I simply remove the fish-eye effect of my DJI Phantom vision 2 lens? [duplicate]

I'm searching a simple and cost-less way to remove the fisheye effect by: adding a material (additional corrective lens) or find the right software (free if possible) to remove the fisheye effect on ...
2
votes
2answers
186 views

Is lens geometric distortion, chromatic aberration and light fall off still as much of an issue? [duplicate]

I saw an earlier question (Why prefer the 18-55mm and 55-250mm lenses vs 18-200mm?) that mentioned lower quality lenses have distortion, aberration and light fall off issues. Has software like Adobe ...
3
votes
3answers
638 views

Is lens focal length specified considering the effect of barrel distortion on field of view?

Given a Nikon 14mm f/2.8D ED AF Ultra Wide-Angle Nikkor Lens on a full-frame sensor, in theory the field of view is HFOV: 104° x VFOV: 81°. However this lens exhibits noticeable barrel distortion ...
7
votes
6answers
293 views

Is it technically possible to build a camera body to correct for lens defects?

Most lenses tend to be expensive because the lens needs to be very complicated in order to correct for various optical effects (aberration, etc). Is it possible to build a sensor and processor ...
5
votes
1answer
237 views

What do lens distortion data values a, b and c actually mean?

I've recently been looking at lens distortion correction solutions, and I just wonder what the values a, b and c actually mean. (I'm using Hugin/lensfun, I don't know if these are standard values or ...
1
vote
1answer
74 views

Not quite straight lines; any help in Aperture?

This slightly bent sculpture is, I imagine, suffering from a bit of distortion. I thought that the raw processor in Aperture included lens data to correct this; the lens in question is a 55-200 Nikon ...
1
vote
1answer
628 views

Is there a free application which can apply adobe Lens Correction Profile (.lcp) files?

Seeking a free and preferably open-source, ubuntu-compatible application that can apply Adobe .lcp files to remove barrel distortion. Any recommendations?
1
vote
2answers
1k views

Correct a fisheyed picture using Hugin

I've got a Olympus Body Cap 9mm fisheye lens for my Panasonic DMC-GM1 camera. I was told to use Hugin to correct the fisheyed pictures taken with that lens. When I import my pictures into Hugin, it ...
2
votes
1answer
207 views

Is 85-135mm really the best for every single kind of face?

They say that focal length around 85-135mm is the best for the head and shoulder kind portraits. I've done some tests myself, I can definitely see the differences. The face is more natural looking ...
7
votes
8answers
5k views

Software to auto correct lens distortion based on photo

A photo contains digital information about the make of the camera the focal length,etc. Does any software use this information and auto correct the lens distortion in the photo. I know that Photoshop ...
3
votes
3answers
7k views

Are there any free or better alternatives to Fisheye-Hemi?

I've been tempted to get a fisheye lens (The Nikon 10.5 DX specifically), and have seen the Fisheye-Hemi plugin for "normalizing" fisheye images. Does anyone have experience of using the plugin or ...
5
votes
3answers
155 views

How to make a panorama from pictures with distortion

I recently took the photos for a panorama in Chicago. Unfortunately, I didn't think the situation through properly, and I shot at a wide angle. When I first attempted to stitch the photos, I got this ...
24
votes
4answers
2k views

Do the Lightroom lens correction tools make good lenses less important?

Lightroom has Lens Correction tools such as Distortion, Vignetting, Chromatic Abberation, etc. depending on the brand and model of lens. Due to this feature, is it less relevant what the distortion ...
5
votes
3answers
6k views

How to avoid unflattering facial distortion when using a slightly wide angle lens?

A 35mm prime on a full format body (or 24mm on cropped) is a great lens to walk around with. But when one gets too close to someone to take a picture, invariably some of their features are ...