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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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2answers
284 views

Focus problem in viewfinder mode with the tamron 17-50 f2.8

I bought my 70d and the Tamron SP AF 17-50mm F/2.8 VC. I noticed that I don't have focus when I use the viewfinder but when I use the live view there is no problem at all. Someone might come across ...
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4answers
136 views

Autofocus not working outside scene modes

I've just got my first DSLR (an old Canon 1000D) and I'm having problems with autofocus: When I'm in full auto or any scene mode (sport, portrait...) it works fine and I can make photos normally, but ...
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0answers
92 views

600D Lens Don't Move back and front

My camera lens recently started losing focus. When I press the shutter halfway, the lens just doesn't respond and adjust focus. The flash flickers an electric sound and light but then the camera doesn'...
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votes
1answer
122 views

What setting do I use for a 70-300 lens? [closed]

I have a 70-300 lens and I tried taking a picture of a ship on Lake Michigan. The Picture was blurry and I was using a tripod, What settings do I need to have my camera set on to get nice clear ...
0
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1answer
65 views

How do I work around a problem where my lens won't focus on distant objects?

I have a Pentax K10D with a 28mm lens that will not focus on distant objects. Will an extension tube solve this problem? I do not care about autofocus. Is one tube better than another for manual ...
2
votes
1answer
248 views

How does manual focus work using Leica lenses on other mirrorless cameras such as Fuji XPro1?

I used to own a Leica M4P, now I have gone digital with a Fuji X100. I love the X100 but the autofocus gives me so much trouble for street photography and its manual focus is terrible. I really ...
8
votes
4answers
2k views

How can I take photographs with a large depth of field without diffraction?

I was looking at some pictures by TSO Photography, and I was struck by how everything in the image seems to be sharp and in focus. I do realize that to achieve huge depth of field, you set the ...
9
votes
5answers
9k views

What is the best auto-focus mode to use for bird photography?

Consider the image below: How would the shot be focused here? Using Auto-focus or manual? If there was a cluttered background, will auto focus detect the small bird and sharply focus on it?If manual ...
5
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1answer
169 views

Background warping through foreground defocus

I came across this effect the other day, and have spent the better part of the last week trying to figure out exactly what is happening. When photographing two layers, with the foreground in front of ...
0
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1answer
129 views

Getting a sharp focus on a 50mm when the subject is at 5m - 10m [duplicate]

I'm a novice photographer with a 450D/XSi. I'm using a 50mm/1.8 prime lens to start out and I noticed that a lot of times my pictures end up not being sharp for stationary scenes. I was mostly using ...
2
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3answers
207 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 ...
2
votes
1answer
916 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 ...
0
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2answers
120 views

How to take a photo of a close-up object without focus stacking?

I'm trying to get into product photography and took some fun shots. I'm talking about shots of my iPhone and things like that. What I quickly realize is that I am unable to get enough DOF. I'm using ...
0
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2answers
1k views

Is a Canon 50mm 1.4 lens only meant to focus close range?

Ok, so I currently shoot with a canon Rebel which of course has a 1.6x crop factor. My primary lens is Canon's mid-level 50mm f/1.4. I love this lens for close up portraits and can get a very sharp ...
3
votes
1answer
308 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 ...
29
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8answers
18k views

How to nail focus for DSLR astrophotography?

I've been doing a bit of astrophotography and the problem that I almost always have is nailing focus. I'll manually focus on a bright star or the moon (which hopefully isn't an option!) by magnifying ...
26
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5answers
3k views

What tips and advice do you have for photographing the Aurora Borealis?

A friend has been kind enough to lend me a DSLR for a few months. It's my first foray into DSLR photography, or indeed any kind of photography beyond simply aiming my Canon IXUS at something and ...
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3answers
3k views

Can I combine several low quality pics into one higher quality picture?

Is there an easy tool to combine low quality pics taken from a mobile phone, all of the same thing but taken within a few seconds interval from one another, mostly suffering from slight out of focus ...
1
vote
1answer
344 views

Camera won't shoot in Program mode?

We just got a new Nikon D7100 at work and are having an odd problem. Occasionally the shutter will not release when we try to take a picture. It appears to do this when there's not enough contrastn ...
2
votes
1answer
1k 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 ...
2
votes
3answers
632 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 ...
2
votes
3answers
679 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 ...
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3answers
3k views

How can I get correct focus when taking a self portrait with a DSLR?

Recently I purchased a Canon Rebel T5. I'm a high school student so this was in my budget. I enjoy taking picture of myself and putting them on Instagram... taking photos for my friends' parties and ...
110
votes
7answers
9k views

What is bokeh, exactly?

I understand that "bokeh" refers to out-of-focus areas of an image — but there is obviously more to it than that. What does the term mean exactly? How well is bokeh really understood? Is it purely ...
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3answers
419 views

How can I get tack-sharp portraits with the focus perfectly on my subject's eye?

How can I consistent achieve tack sharp images, when wanting to focus on eyes in a portrait? I am always using single focus and moving the focus point to the eye and recomposing if necessary. What ...
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5answers
238 views

How can I get my camera to focus on water dropping?

Here is how I have my DIY style setup: Water is dropping where the coin is, I put the coin there with the hope that it can focus on the coin but it couldn't. I am on AF-S , S and use AF-ON button ...
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1answer
223 views

Best focusing techniques with sony a7r

I've been using the Sony A7r for a few days. I mostly do landscape and street photography, but I enjoy studio/modeling as well. With modeling I normally use the focus and recompose technique, ...
9
votes
2answers
2k views

How does ground glass work when focussing?

To use ground glass, I turn the focusing ring on my lens until the image becomes clear on the glass. But what is it about the glass that makes this work? What are the physics involved?
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vote
3answers
656 views

How to achieve sharp focus on two subjects in a portrait with low depth of field? [duplicate]

I prefer to have a very narrow depth of field. Whenever I am focusing for portraits of too people standing near to each other, the focus-point-selected person is sharp, while the person standing next ...
0
votes
1answer
73 views

set manual focus distance [duplicate]

My nikon D3100 with 18-55 lense set to manual mode. How do i set the focus to 10.5 meters as required for a landscape photo using Hyperfocus calculation. The camera has a range setting for focus but ...
9
votes
5answers
4k views

How can I get maximum DoF with no distance markers?

I am aware of what hyperfocal distance is and the general principles behind it. However, most of the tutorials I have seen and read regarding it make use of lenses with focus distance indicators. ...
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votes
6answers
1k views

Why don't we focus at the nearest hyperfocal distance to get everything in focus?

I came across this article, and it says that if we focus at a hyperfocal distance, then everything from half of hyperfocal distance to infinity will be in focus. Then why don't we set the focus ...
2
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2answers
5k 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 ...
0
votes
1answer
201 views

How do prime lens allow variance of focal length when focusing? [duplicate]

If the definition of prime lens says that their focal length is fixed, then how come you can still alter the focal length when focusing? (either MF or AF)
27
votes
6answers
7k views

Can I damage the focus system by turning the focus ring when the lens isn't mounted?

I have a couple lenses that don't have an internal focusing system, and whenever I want to put them back in my bag, I turn the focus ring to make the lens shorter. I noticed that when the lens is set ...
8
votes
1answer
36k views

What is the difference between AI Focus and AI Servo autofocus modes?

Recently I bought a Canon 60D and I am uncertain about when and how to use/activate the AI Focus and AI Servo functions. I understand the One Shot autofocus function for still subjects. You press ...
14
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5answers
19k views

What is “infinity focus”?

I have been reading a bit about astrophotography and the term infinity focus keeps coming up. What is infinity focus and how do you set the camera to infinity focus?
3
votes
2answers
162 views

Why is the battery required to manually focus through the viewfinder?

Is it normal that I can't manual focus any of my lenses on my 5D MK iii without having a battery inserted? I can focus on an object, and while looking through the view finder, remove the battery and ...
14
votes
1answer
7k views

What is a focus limiter?

What is a focus limiter and how does it work? What is the advantage of it? For instance Tamron 90/2.8 Macro has a focus limiter. According to the documentation: In the limit position, the Tamron ...
2
votes
1answer
298 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 ...
5
votes
4answers
2k views

Are there cheap or DIY focus assist solutions for the Canon 5D?

I want a better autofocus system for low light. Low light auto focus is my biggest bane. I use a 5D so the options are AF on a flash like the 430 or 580. I happen to use the Pocket Wizard TT1 so I ...
0
votes
1answer
3k views

What is the difference between touch focus and autofocus?

I have a cheap Chinese Android phone, a Landvo l200 based on MTK68XX chip. It claims to have a 13MP touch & autofocus camera. I wanted to know how this autofocus feature differs from touch focus ...
3
votes
1answer
93 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 off....
3
votes
1answer
189 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 ...
4
votes
3answers
178 views

Does hyperfocal distance only apply to manual focussing?

At any given aperture and focal length, I can still focus on something near or something far away by simply touching the lcd on my dslr. Does that mean that because I may not be focussing at the ...
0
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2answers
88 views

Find focus and effective range of single focus camera

I have a cheap camera that is supposed to take videos underwater. It is a camera in a case that is set to a single focus. I checked the specs and it is a manual set focus camera. When I asked the ...
0
votes
0answers
298 views

Samsung NX1000 focus ring does not work, can't get off manual focus mode either

I bought a used Samsung NX1000 last night, everything is great but it's stuck on Manual Focus mode. The Single Auto-Focus [SAF] and Continuous Auto-Focus [CAF] are greyed out no matter what I try. ...
6
votes
2answers
877 views

How does autofocus confirm work with manual lenses?

When I was a kid my dad had an Olympus OM10, he had a bunch of lenses for it and I remember focusing was done with a special circle in the middle of the viewfinder, where you pointed it at the thing ...
4
votes
2answers
1k views

Why do I get blurry pictures at far distances, but sharp results up close?

I took this picture: https://www.flickr.com/photos/91552641@N06/15828810701/ and if you look at the details (like the trees on the right side) they are all kinds of muddy. I had the same experience ...
0
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3answers
425 views

Image in focus at the back (LCD) but not when shown in computer

I take pictures of fishes in my photo tank. But every time the photos come out a little blurry and never totally sharp. I only get to know that my photos are useless is when I see them on the computer ...