Questions tagged [aberration]

a property that deviates from the desired behavior

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3
votes
1answer
157 views

What is lens astigmatism?

Can someone simply explain astigmatism and its different types? How are they caused in lenses, and how can they be identified in images? I'm looking for a simple, understandable explanation. I've ...
2
votes
3answers
251 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 ...
12
votes
1answer
221 views

What causes color artifacts on the strings while shooting guitars?

We're doing a photoshoot of a guitar collection. The photos are coming out great, but there is a specific color aberration on the strings. The guitar strings are braided by a thin metal wire, which ...
1
vote
1answer
442 views

What's the relationship between chromatic aberration, ISO and long-exposure noise reduction?

I took a photo that has what seems like chromatic aberration. It's a purple color at the left and bottom edges, especially at the bottom-left corner: This is a 30-second exposure at ISO 3200 with the ...
2
votes
2answers
315 views

Is it chromatic aberration? [duplicate]

I got green ghost-like lights. Where do they come from? How could I avoid them while shooting? How can I remove it in post processing? I tried using Lightroom chromatic aberration correction ...
12
votes
3answers
2k views

Is it normal for a fast prime to exhibit purple fringing in middle of the image?

I have just bought a Nikon 50mm f/1.8D prime lens. I took this picture (leg of my glasses frame on a mouse, and a LED desk lamp is on top of it) : f1.8, 1/80s, ISO 200 The purple fringing is right ...
10
votes
3answers
10k views

How to fix chromatic aberration with free software?

Here is a zoomed-in example of an image I shot that has a bit of discoloration due to the chromatic aberration of the lens. What's the easiest way to fix this problem using only free software such ...
3
votes
4answers
7k views

How to minimize/avoid purple fringing before/during shooting?

I know it is possible to avoid purple fringing using post-processing software's chromatic aberration correction capabilities but I have a few pictures where the one I'm using (Rawtherapee on Linux) ...
2
votes
3answers
164 views

Can gripping a lens too hard cause softness/aberration or other damage?

I have a Nikon D80 kit lens with a circular screw-on polariser filter. In order to remove the filter I might have to grip the lens quite hard, and the end of the lens might be moved about in the ...
6
votes
1answer
578 views

Which lenses show focus shift?

Some lenses, because of a design that includes uncorrected spherical aberration, shift their plane of focus backwards as the aperture is narrowed. This is most apparent at close focusing distances and ...
2
votes
1answer
471 views

Compensating for Focus Shift?

Some lenses, because of a design that includes uncorrected spherical aberration, shift their plane of focus backwards as the aperture is narrowed. This is most apparent at close focusing distances and ...
1
vote
2answers
357 views

What can cause different aberration on left side and right side of photo?

I got a photo of starry sky where I find different kind of aberrations on the left side and the right side of photo. It seems consistent in various photos so far, but this lens is quite new to me and ...
15
votes
4answers
5k views

Is it a bad idea to activate lens-corrections in camera, when also use lens-correction in Lightroom?

My EOS has the option to correct known lens-aberration which is activated at the moment. I use Lightroom (5.2) for post-processing, which can also correct lens-aberration. Is it a problem to ...
4
votes
2answers
3k views

What causes longitudinal chromatic aberration on Nikon 50mm f/1.4D?

I have looked on my new 50mm lens photo (I have Nikon D90) and I see "purple fringing" around the unfocused objects (longitudinal chromatic aberration). What's is going on? Is it common for this lens (...
10
votes
4answers
849 views

What is the meaning of these Photodune reasons for rejection?

I wanted some advice, I am new to photography, I posted an image on Photodune for sale and it was rejected because of: Element or framing composition Noise, exposure, lighting or saturation Chromatic ...
11
votes
1answer
3k views

What are these lines through my images (on the negatives and the prints)?

I have these lines or streaks across many of the images on this roll I had developed. I can see the same lines on the negatives as well as the prints. The lines are in the exact same spot across I ...
7
votes
6answers
327 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
7answers
926 views

Is this sensor ghosting, or something else?

I recently took some shots of a house fly, primarily for use in a simple case study of print sharpness that I posted here. Several of the shots turned out fairly well with flash, however they all seem ...
11
votes
4answers
7k views

How many optical aberration types are there in lenses? And what are they?

Everyone hears something about chromatic aberration but are there any other types? What causes them?