Lunch atop a (Springfield) skyscraper

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Focus is the mechanism of converging light from a point light source onto an imaging plane by a lens.

learn more… | top users | synonyms

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3answers
240 views

Precise focus information in metadata

I am trying to get the precise focal length used for a stack of photographs taken with various focal length. See the following link. My problem is that even if the photographs are obviously focusing ...
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2answers
914 views

All my photos were blurry

I recently did a shoot of a baby and my 6 year old son, and I got some fantastic shots that were super sharp. I then did another shoot of a 6 year old and toddler and every single photo was slightly ...
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3answers
2k views

Is there a webcam that can focus to infinity, for time-lapse landscapes?

Does anyone here know of a webcam (at least 720p) that has the ability to focus to infinity? At least one webcam I know of (Logitech C910) doesn't allow that. I would like to use it for time lapse ...
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1answer
213 views

Do lenses have focal planes or focal spheres/ellipsoids?

The title says it pretty much all. I'm asking this because I find myself always using the focus point in the center, and after I focused, I rotate my camera to make the framing right. However, if ...
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3answers
541 views

Do focus area modes matter if shooting in manual focus?

It seems my camera lets me change the focus area modes (e.g wide, center or spot) even when I am shooting in manual focus so I am trying to understand if area modes matter even if the camera is in ...
3
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1answer
2k views

Taking pictures with fixed/full focus camera

I have got a fixed focus, 5 MP camera with 3.3mm focal length (not sure what it means) on my phone. I want to know what's the best way to take pictures with since it's missing auto-focus feature. Is ...
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2answers
632 views

How To Fix Badly Functioning Shutter Release-Button?

I have a compact Pentax OptionM10 which I bought in 2006 and sometimes shutter-release button works only when pressing it on edge and under specific angle, but mostly as I apply little pressure which ...
3
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1answer
302 views

Are there cameras that autofocus during an exposure?

The origin of this question is related to panning. I was trying to explain why panning is more effective for subjects moving across your FOV at right angles, vs. a subject whose distance to the ...
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1answer
163 views

Diagnose a damaged lens from focus test results

I have a lens that gives perfectly decent results at f/22 and f/32. Here's its capture of an ISO 12233 test chart: It's not the sharpest lens I own, but whaddaya want, it's a quarter century old ...
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1answer
3k views

What settings affect how the focus points are displayed for my 7D?

My Canon 7d is about 2 months old. I used it for a shoot in DC, and it just isn't behaving as expected. When I try to focus, I get little black boxes in the focus frame. They used to be black, with ...
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1answer
178 views

Does lens focus affect the appearance of sensor dust?

I know that aperture affects the appearance of dust on a camera's sensor (or, technically, the filter in front of the sensor), but does focus matter at all? Since the dust is behind the lens, I ...
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1answer
829 views

Why does my Canon 1000D focus only on the bottom part of an image?

I had it checked in case it needed repair, but they said they could not find a problem with it. I really need help on this one. [the process] I turn the camera on, select M mode, select the top ...
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2answers
93 views

Eyes rapidly defocus when taking pictures

I wear glasses for an astigmatism. When taking photos, I find that my eyes lose focus almost right away, since one eye is closed and the other is looking through the viewfinder. This happens whether ...
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7answers
180 views

How to reduce noise shown in LiveView when photographing in the dark?

At night, when I want to take photos, I usually use LiveView to focus instead of the optical viewfinder. So I set my camera on a tripod, go to LiveView and use manual focusing to get the focus. But ...
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1answer
94 views

How do you focus a shot with an IR/UV passfilter?

I'm researching the world of photography outside of the visible spectrum and I'm really curious to get my hands on some filters, the Baader-U for example, to try shooting in these spectra. However, I ...
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2answers
2k views

How to calculate the size of the image circle at infinity focus?

How can I determine the diameter of the image circle (i.e. the diagonal size of CCD required to fully utilise a telescope's optics) at near-infinity focus? I have looked around online and found this ...
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2answers
111 views

What's a good method to autofocus on close subjects while shooting from the hip?

Context I like to take photos of dogs using a wide angle lens on a Canon 60d, with a fast shutter speed, AI servo mode and continuous shooting mode on. I'm usually holding the camera low to the ...
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2answers
498 views

How to do focus stacking with Sony A7?

It seems that software like helicon remote or EOS utility which allow you to pick focus points remotely make focus stacking so much easier. I couldn't find anything like that with Sony A7. Even's ...
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1answer
91 views

Why is manual focus off after installing a 45° split-prism focus screen?

I recently bought a new focus screen for my D5100. I installed it without any problems. But, if I manually focus with the screen it is not correct. A picture of something 30ft away is about a foot ...
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4answers
2k views

How do Canon 600D and 650D compare with respect to focus points types?

My photographic style is action, and according to a website that I read I need at least 9 focus points to get better photos. I'm considering getting a Canon EOS 650D, but it turns out that it has ...
2
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2answers
244 views

Why doesn't pixel peeping with magnified Live View give the sharpest possible image?

I've seen this comment (most recently in this question), or similar, in several answers here on photo.SE: "Pixel peeped images aren't likely to look sharp". Why is that? It would seem to me that if ...
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2answers
554 views

How can I find which lenses have “Continuous manual focus”?

Canon lenses with USM auto focus can be called "continuous manual focus" (at least some). By this I mean that you can override the AF without switching it off. I've found this very handy, and I often ...
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2answers
2k views

What is the difference Focus mode and AF-Area mode?

I am using Nikon D5100. To shoot a subject which is: Stationary: we can set AF-area mode to Single Point AF we can set Focus mode to AF-S Moving: we can set AF-area mode to Dynamic-Area AF we can ...
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2answers
210 views

What would appear on polaroid film exposed without a lens?

I am trying to get a better understanding how lenses & focusing works. Let's say that I am standing in a completely dark room holding a unexposed polaroid film, and turn on a TV in the other ...
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3answers
11k views

What does infinity focus mean and when should I use it?

All my lens have focus ring where at the end there's an infinity symbol. What does that mean? If I'm taking landscape shot and what everything from near to far to be in focus, do I use infinity? Or am ...
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4answers
274 views

How can I take better pictures in theatre fog?

I am taking still and video photography for a film production. It is set inside a theatre that is filled with light fog. I somehow can't get sharp focus and because of the low light I can't up the ...
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1answer
885 views

Is it possible to get bokeh in cellphone photos?

I have wondered how to get some parts of the image out of focus when using smartphone cameras (or if it can even be done). Recently found out about the concept of bokeh, and am interested in ...
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2answers
3k views

How can I see photos on my PC as I shoot them?

I am trying to find out how to use manual zoom. Can I connect the camera to my laptop and see the images on PC as I shoot them? I have a Canon 550D Rebel 2Ti. Do I need any special cables for this?
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2answers
1k views

Is there a way to do focus bracketing on Nikon D90 with Nikkor 105mm f/2.8?

One feature I loved in my old Canon G6 was the ability to do focus bracketing in macro photography. Any hope of focus bracketing using my Nikkor 105mm f/2.8 macro lens on my D90 body?
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2answers
58 views

Fine tuning a lens focus [duplicate]

I just got a 35mm f/1.4 lens and wanted to see if it has any focus issues to be fixed. So I got this kit and not sure what exactly I should have done but I focused on the middle of that bar code like ...
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2answers
121 views

Are deconvolution filters better than unsharp mask for correcting out-of-focus photographs?

What is the best method for enhancing image quality if a photograph happens to be out of focus? I'm using now unsharp mask but I'm looking for new methods. Perhaps there is one which has better ...
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2answers
210 views

What determines the sharp parts in an image: the DoF or the focus point?

I am a little bit confused between depth of field (DoF) and focus points. Which of them is responsible for making part of the image sharp?
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5answers
387 views

Aperture priority mode in high speed lens while photographing more than one person

I use 50mm f/1.8 lens(with Canon T3i) for portraiture. It's quite easy when only one subject is involved :Open the aperture wide, focus on the eyes(most of the times) and you get a nice portrait. How ...
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3answers
616 views

Lack of sharpness: is it me, or my zoom lens?

I am specifically talking about Nikon 24-70mm f 2.8 lens Here is the picture I took with that: And here is another one I took with my prime lens Nikon 85mm f 1.8 I think this one is sharper and ...
2
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4answers
910 views

Nikon D3300 - Trouble Focusing on Birds both Stationary & Moving

I would like to know how to correct for the problem of capturing moving (or even stationary) birds amid foliage. Too often I end up with a blur even when I use a fast shutter under bright sunlight. ...
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2answers
4k views

Focusing on hyperfocal distance with Nikkor 35mm f/1.8G prime lens [duplicate]

I have a Nikkor 35mm f/1.8G lens on a Nikon D7000 body. I have a theoretical understanding of hyperfocal distance. And it seems like the lenses with an clear indication of "infinite" focus point are ...
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3answers
927 views

How does autofocus point selection relate to manual focus?

Every lens I have comes with an auto-focus / manual focus switch. How should it be used if I am shooting on AV mode? If I were to select one of the focus points, do I need to have the lens on ...
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3answers
545 views

What factors determine the size of focus step done with remote shooting?

When a DSLR camera is used for remote shooting, corresponding software usually provides very simple way to change focus position: small, medium and large steps forward or backward. This is how it ...
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2answers
2k views

Why is my lens focusing sound lounder than before?

I'm new to DSLR camera. I didn't mount a lens properly. The camera still allowed me to take photos, so I didn't notice the error. After I had been using it for 10 minutes I noticed my error and ...
2
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1answer
239 views

Nikon 18-55 mm Lens Focus Wheel Jammed

I accidentally dropped my Nikon D3200 with a 18-55 mm lens about a foot onto a hard carpet. It originally looked ok, however I soon realised it wasn't focusing. I saw that the focus wheel was jammed ...
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2answers
6k views

What is the difference between depth of field and focal plane?

I would like to know how to address the difference between them and how relates to each other.
2
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2answers
275 views

Automatic vs Manual Focus [duplicate]

Possible Duplicate: When is manual focus better than autofocus? Perhaps this question has been asked before. I understand that in some cases, automatic focus cannot be used, for example, ...
2
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1answer
504 views

Why is my Canon Powershot A1100 focusing only on the bottom part of scenes?

I've been using a Canon PowerShot A1100 IS camera for the past year and it had been working just fine until I decided to change its settings. After I had serious trouble with it, I reset the settings ...
2
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1answer
130 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 ...
2
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1answer
4k views

How do I select a focus point on the Nikon D5000?

My Nikon D5000 has 11 selectable focus points but shamefully I don't know how to choose another point other than the center point. How can I do this? Am I misunderstanding concepts?
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3answers
172 views

How to overcome auto-focusing problem in event photography?

The biggest issue for event photography I have noticed is camera not getting auto-focus at correct time. The moment you have to capture the camera is still focusing. If it would be landscape ...
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2answers
223 views

Programmable cameras that can take multiple shots at different focus settings

To do focus stacking in case of moving subjects, it would be useful to have the ability to preset different focus settings and let the camera take the pictures with the different settings in fast ...
2
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1answer
915 views

Wide angle + macro converter

I just bought an "0.43x Super Wide Angle" converter. The converter consist of two separate parts, a wide angle (W) part and a macro (M) part. The full converter screws on the filter thread of my Sigma ...
2
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1answer
78 views

Can Minolta lenses obtain infinity focus when mounted on a Canon camera?

I know this isn't the ideal setup but I have access to a good selection of Minolta glass so I can try it without any expense. I've got a Canon 600D, a "Minolta Sony Alpha AF Mount Lens to Canon EOS ...
2
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1answer
717 views

Canon EOS SL1 - Manual focus stopped working

I recently purchased a Canon EOS Rebel DSLR SL1. My 18-55 mm lens shoots amazingly, and I have been using it in auto and manual focus. About a week ago, my manual focus randomly stopped working. The ...