Spring 2012

Spring 2012
by ani

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

learn more… | top users | synonyms

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 ...
13
votes
6answers
27k 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 ...
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 ...
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 ...
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.
10
votes
2answers
203 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? ...
10
votes
1answer
4k views

What are Barrel and Pincushion distortion and how are they corrected?

I have some questions regarding Barrel distortion and pincushion distortion. Since they are related I have put them in single post. I am aware that barrel distortion occurs more in wide-angle ...
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?
8
votes
1answer
2k views

How do straight edges end up curved in photos?

In the standard model for a lens straight lines in the subject of a photograph will always end up straight. However I have seen a variety of photographs in which straight lines end up being curved, e....
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 ...
7
votes
6answers
292 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 ...
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? ...
7
votes
1answer
395 views

What causes this bluish tint and other anomalies in this image?

I bought a Tamron CF Macro 28-70mm 3.5-4.5 lens on eBay for $35 AUD plus postage - cheap enough to give it a go and see what it's like. I took a range of photos with my Sony NEX-C3 to get a feel for ...
7
votes
3answers
1k views

Is pincushion or barrel distortion really all that bad in a lens?

Given that software can pretty trivially fix pincushion and barrel distortion patterns if you're shooting in RAW (Lightroom did the right thing just by knowing what lens I used with the given EXIF ...
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 ...
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 ...
6
votes
1answer
866 views

What does “distortion <XX%” mean in lens specs?

I'm going to buy a lens and I would like to understand what "distortion <XX%" means. It's a vari-focal 10-60mm lens, and mentions distortion <12-1%. According to my understanding, at 10mm focal ...
5
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 ...
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 ...
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 ...
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 ...
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 ...
4
votes
3answers
929 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 ...
4
votes
1answer
171 views

why close ups are too wide

I have been taking close up pictures for a while with no problem. I think I may have done something with the settings, because all of a sudden my closeups are distorted (wide). I have a sony cyber ...
4
votes
2answers
416 views

Which raw processors interpret distortion/CA correction from Micro Four Thirds cameras?

I've been thinking about Micro Four Thirds, which in many cases encodes distortion and chromatic aberration correction into the raw files. But, the raw processor I currently use (Bibble) ignores this ...
3
votes
4answers
339 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 ...
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 ...
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'...
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 ...
3
votes
3answers
251 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 ...
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 ...
3
votes
3answers
631 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 ...
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 ...
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 ...
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 ...
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', ...
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 ...
2
votes
1answer
2k views

Auto cropping scanned document or photo

I usually take a picture of bill or receipt using my mobile phone and store it in a computer. Is there any desktop or Web-based software which can straighten the photo of a paper and flatten it? For ...
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 ...
2
votes
1answer
1k views

Are Nikon Distortion Control Data firmware updates critical?

Nikon has released the Distortion control data upgrade for D90 and D5000 (I am an owner of Nikon D90). The Distortion Control Data firmware upgrade is available for Nikon D90 and D5000 cameras ...
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 ...
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
vote
4answers
3k views

Seeking Mac Software Solution for Correcting Barrel Distortion

I have a Nikon D7000 and a 14-24 wide angle lens which I love, but it does result, often, in a great deal of barrel distortion. I'm seeking a software solution; ideally an Aperture plug-in, to ...
1
vote
2answers
196 views

Are there medium priced cameras that can capture photos with very little distortion?

I just got the Sony DSC-WX9 and DSC-HX100V a couple months ago, and found that, if a person's face is right in the center of the photo (for a photo with 4, 5 people standing, from head to toe), then ...
1
vote
3answers
551 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
382 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 ...
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 ...
1
vote
2answers
1k views

Nikon 50mm f/1.8 D has less distortion than Nikon 50mm f/1.8 G?

Some of the Amazon reviews say that Nikon 50mm f/1.8 D has less distortion than Nikon 50mm f/1.8 G? The D is about $80 cheaper, is smaller, lighter, has less distortion, and has manual aperture ...
1
vote
2answers
134 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
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 ...