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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
76 views

Why “plane of focus”? [duplicate]

The spatial locus on which a lens/camera focuses (and so appears sharpest in the resulting image) is always referred to as the "plane of focus". My question is why does it have to be a plane? As I ...
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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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4answers
2k 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. ...
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 ...
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3answers
1k 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 auto-...
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3answers
631 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
297 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
8k 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
278 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, fast ...
2
votes
1answer
532 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 ...
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1answer
139 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 ...
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1answer
5k 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?
2
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1answer
75 views

How does refocusing in a dual lens work?

HTC One (M8) and the recent Huawei P9 offer dual lenses. This allows the option of refocussing after the picture has been clicked. Could someone explain how does that happen? How does the software ...
2
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3answers
205 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
263 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 ...
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1answer
1k 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
votes
1answer
54 views

How can I use AF+MF on Fujinon lenses with hard stop focus rings?

Fujifilm cameras have an AF+MF mode which autofocuses when the shutter button is half-depressed, then lets you correct it using the focus ring. However, some Fuji focus rings have hard stops, so you ...
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2answers
42 views

What is the point of the Olympus E-620 infinity reset

In the manual, it states: RESET LENS When set to [ON], this resets the focus of the lens (infinity) each time the power is turned off. What does this mean? Does this mean that if I were to turn ...
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2answers
164 views

Are focus and noise problems I see with my Nikon D80 simply because newer cameras are better?

I can't seem to get photos with good focus or without noise. Is it the fault of the Nikon D80?I have read that cameras only two or three years old have much better light sensors and that that is what ...
2
votes
3answers
431 views

How can I “unblur” these pics of the Northern Lights?

A total NOOB to photography here. I was in Tromsø, Norway this weekend and was lucky enough to capture some pictures of the lights. Now, when I say I'm a noob, I actually mean that I know very, VERY ...
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2answers
100 views

Is recomposing necessary for trap focus to work?

Trap focusing guide says: Set custom setting #A5 to AF-ON ONLY Set the focus mode to SINGLE SERVO Set Auto focus area mode to SINGLE POINT (9 point, 21 point, 51 point or 51 point 3-D will ...
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1answer
127 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
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 ...
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votes
1answer
415 views

How does a focus ring bring a subject in or out of focus?

When you manually adjust your focus ring on the lens, what actually happens inside the lens? Is this changing simply the point at which the lens is focusing, so that anything at this distance away ...
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2answers
2k views

How can I get better results when manually focusing with my Nikon D7000?

For some reason I seem to have problems getting consistently well focused photographs. They are not always crystal sharp and this frustrates me. I know if I set the camera to auto, they are always ...
2
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1answer
269 views

What types of rangefinders are there and what are the differences between them?

I have watched videos on YouTube showing the view through the M9 viewfinder, and it appears that only a small window in the middle allows you to focus. However, I once tried out an old Voigtländer ...
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 ...
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0answers
34 views

How do smartphone cameras focus? [duplicate]

I'm curious, when I focus my DSLR or my pocket camera the lens moves back and forth changing the distance from the sensor. Does this really happen inside my smartphone?
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4answers
3k views

Why can't my DSLR with kit lens focus on objects close to the lens?

I have a Nikon D5200 with the 18-105 kit lens. I cannot focus the objects which are 15-20 cm away from the lens. Can anyone tell me how to manipulate the settings so that i can focus those objects? ...
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2answers
2k views

Why does this lens lose focus when you zoom in but not when you zoom out?

This is regarding the Sony 18-105 E-mount constant-aperture zoom. I took at photo at 18mm, focusing manually: I then zoomed to 105mm, and took another photo, keeping the same focus: Notice that ...
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6answers
788 views

How do you take a picture without focusing?

So I've just started getting into photography. I'm currently experimenting with taking long exposure photos at night, but my house doesn't have the ideal surroundings for a good pic. Is there any way ...
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2answers
511 views

Is there a way to use phase detection AF with live view on a Canon EOS camera?

On any of the EOS xx(x)D model that has the live view function, can the camera make focus using the AF collimators (instead of using contrast detection), as it's possible on the old Nikon D300 ? If ...
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2answers
177 views

What could be causing focus problems in low light?

I am not a professional photographer but shoot outdoor and indoor pictures, weddings, and portraits as a hobby. I use a Nikon D750 with a 70-200mm 2.8 VR lens and a 35mm 1.8 ED lens. I have been ...
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2answers
473 views

Manual focus working in AF Mode with an STM lens - is this intentional?

On my new Canon T6s/760d with 18-135 STM lens, I just noticed that in AF mode, when I hold the shutter button halfway, if I turn the focus ring on the lens, it does affect the focus! I preferred to ...
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4answers
563 views

Autofocus performance of different brands at night

Are there huge differences in the ability to focus in low light between different brands and models? I have a Pentax Kx with a Sigma 30mm 1.4. My problem is, that the camera's autofocus does not work ...
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2answers
250 views

How can lens cause consistent front or back focus?

I can understand body focusing problems, but I can't imagine why lens might cause front or back focus. I have two third party manufacturer lenses for my Nikon: one is front-focusing, the other is back-...
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1answer
343 views

My photos are way too dark, must use 6000+ ISO inside

I have a problem. I recently got a new lens (18-105mm) and my pictures just gets dark. I am shooting in manual mode, I changed to automatic mode without flash and it got lighter. There must be a ...
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3answers
73 views

Can trap focusing damage the shutter release system?

Trap focusing requires the photographer keep the shutter pressed (point#6 below) until the object appears at the point where camera is pre-focusing. Set custom setting #A5 to AF-ON ONLY Set ...
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vote
3answers
340 views

Why can't I get a sharp macro image when shooting handheld, even with IS?

These days I shoot macro handheld, using the focus and recompose technique. I used AF-one shot. I used a Canon 100mm 2.8 on my Canon 550D. My shutter speed was 1/100s, but it was quite frustrating ...
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2answers
2k views

Nikon D3000 Blurry Pictures. Focus Issue?

Here are two examples: Both pictures are in NEF format here. The pictures have not been modified in any way except except for being resized and converted to PNG. Just for kicks (and to prove I'm ...
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2answers
590 views

Help me understand effective f-number

If I set a lens to, say, f/2 but my focus is set to its closest point, my effective f-number won't be f/2 any more but it will be higher by a factor that depends on focal length, image magnification ...
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2answers
168 views

How can I focus when my camera is on a tripod and none of the focus points line up?

Today I was shooting two persons with my camera (Canon 7D) on a tripod. One person, the one I wanted to be in focus, was composed so far out of the center that I don't have any focus point close to ...
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3answers
417 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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vote
3answers
509 views

What techniques are there to get focus and/or lock exposure other than center, half-press, and recompose?

The way I shoot is this: turn the camera so that the subject is in the middle of the viewfinder, where my center point is, press the shutter half way, the camera now focuses the lens on the subject ...
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2answers
983 views

Why does focusing feel less accurate to me on the Canon 600D than the 60D?

Is there a substantial (or minor) difference in the focusing in 60D and 600D. I tried both in a showroom and felt (I may be wrong) that there was a difference. The focusing I felt was very quick and ...
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vote
1answer
1k views

What should I do if my Canon 24-105 f4 L is making focus-seeking noises but not focusing?

I have a Canon 24-105 f/4 L lens. Just today, it started having focusing problems. The problem does not manifest if the focus is easy: bright light and centre focus point is on a good contrasty ...
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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 ...
1
vote
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, ...
1
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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 ...