Shadowy Daisy

Shadowy Daisy
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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
16 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'...
1
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2answers
136 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 (...
1
vote
2answers
87 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
47 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
643 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
votes
3answers
162 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', ...
0
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3answers
202 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
102 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
340 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 ...
0
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2answers
90 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?
10
votes
2answers
206 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? ...
1
vote
4answers
129 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 ...
0
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6answers
132 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 ...
1
vote
3answers
564 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
101 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
65 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
365 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
225 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
1k 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 ...
1
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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 ...
0
votes
2answers
100 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 ...
0
votes
1answer
40 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
177 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
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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 ...
1
vote
2answers
424 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 ...
1
vote
2answers
383 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 ...
7
votes
4answers
707 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? ...
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
0answers
188 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 ...
5
votes
1answer
235 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 ...
2
votes
2answers
185 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 ...
1
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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 ...
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
1answer
617 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
205 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 ...
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 ...
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 ...
2
votes
3answers
279 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 ...
3
votes
3answers
253 views

What's the succinct reason for face-warping in wide angle lenses?

Is there an accurate way of explaining face-warping when using wide angle lenses? I realised I can't actually explain it without diagrams, so a succinct definition (no more than a few lines) would be ...
2
votes
2answers
203 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 ...
7
votes
4answers
1k views

How can I check for damage to my lens from impact with a window?

I was taking a photo at an airport when I accidentally zoomed my Canon SX40HS into a window. The impact wasn't super hard, but there was a thump. I cannot see any visible damage, but how can I check ...
0
votes
0answers
95 views

How to transform image to be projected undistorted onto a sphere [duplicate]

I found this similar question: Is it possible to print a photo so it can be mounted on a globe? I do not believe the similar question is a "duplicate" because it is for a similar but different effect....
9
votes
3answers
1k views

What's the term for wide angle lenses with no distortion?

Is there one word to describe the difference between wide angle lenses that have a circular distortion and wide angle lenses that produce images where perspective lines remain straight?
7
votes
1answer
2k views

How difficult is it to correct mustache-style distortion?

I am considering the Samyang 14mm Ultra Wide-Angle f/2.8 IF ED UMC but I am somewhat concerned about the 5.3% of mustache-style distortion this lens produces. I like most of what I read about this ...
3
votes
3answers
633 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 ...
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 ...
1
vote
1answer
254 views

What is this warped effect and how to achieve it?

What is the name of the effect used in this photo and how do you apply it to a photo? As you can see, the nearest servers (which look like cupboards) are somewhat distorted. That is the effect I ...
4
votes
3answers
931 views

What lens for taking photos of artwork with Nikon D800 without distortion?

I'm an artist and I do need to take photos of my paintings with heavy texture. I bought a 50mm f1.8 with my new Nikon D800 and I find some distortion when the painting is big 36"x 60". I used to ...