Nidelva river through Trondheim Norway

Nidelva river through Trondheim Norway
by Saaru Lindestokke                

Submit your Photo
Hall of Fame

Please participate in Meta
and help us grow.

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

learn more… | top users | synonyms

11
votes
3answers
519 views

Different colors of light are disrupting my focus. What lens feature minimizes this?

I took this photo with a Canon 50mm compact macro lens & Canon "life size converter", and it looked somewhat fuzzy. After separating out the RGB channels, it seems evident that the different ...
5
votes
6answers
247 views

Why are my sports team pictures fuzzy?

UPDATE: I added the largest jpeg files I could with the original tone, unedited except for a cropping and the change from RAW to jpeg. Thanks for everyone's advice!! This forum is awesome! I use a ...
2
votes
2answers
150 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 ...
0
votes
1answer
74 views

Are any photographers known to intentionally make “creative” use of front/back focus settings of a camera?

A couple of weeks back I was testing my lenses for front/back focus, and an idea struck me: it's entirely possible to setup the camera to constantly back or front focus, so to permanently change the ...
1
vote
2answers
107 views

Nikon focus and recompose: identifying behaviour on different models

My Nikon D3000 refuses to take a picture if I focus and recompose with the AE-L/AF-L button set to "AF ON". (The focus point is on an out-of-focus part of the image after I recompose, so the shutter ...
3
votes
1answer
441 views

Nikon 16-85 VR focus noise problem?

My 16-85 VR is doing some weird noise during focus, manual or auto. It's like an hiss. I asked in a local shop and they said it can be some microdust inside the lens. But I'm a little worried it can ...
2
votes
1answer
69 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 ...
0
votes
2answers
64 views

How can I improve my soft-focus shots out of a moving vehicle?

I was shooting with a shutter speed of 1/4000, f/7, ISO 800, using a 70-300mm telephoto lens. I have been shooting through the windshield of my SUV. Is there a filter I can use to help me get better ...
0
votes
1answer
103 views

Focus issues in a Nikon 24-70 f/2.8 lens

I have a Nikon 24-70mm f/2.8 (without VR) and the pictures taken with it are not sharp and crisp as I think they should be. I use it with a Nikon D7200 that works perfectly with a Nikon 70-200mm f/2.8 ...
3
votes
4answers
131 views

Why is my subject still out of focus when it's inside the range shown by a depth of field calculator?

In a depth of field app, I entered my camera's sensor size, focal length of 50mm, aperture of f8, and focus distance of 6 feet. The app tells me that DoF is 2.1 feet, from 5.1 to 7.2 feet. I then ...
35
votes
4answers
62k views

What is back-focusing?

What is back-focusing? Is it something I need to be worried about, or can I just live with it? How can I tell if my camera/lens is sufferring from it?
22
votes
7answers
3k views

Any cameras move the sensor instead of lens elements for focus?

All the cameras that I'm aware of move lens elements to obtain focus, although I'm not familiar with the workings of in-phone cameras. It occurred to me this morning that you could also focus by ...
5
votes
3answers
695 views

Since it's not “focal length”, what is the term for the distance at which things are in focus?

I was under the impression that the “focal length” of a lens is the distance at which stuff appears in-focus. (E.g., perhaps I set the camera so that objects 3 meters away appear sharp, ...
0
votes
2answers
52 views

Focus change after switch off camera?

I am using a zoom lens. The focal length is adjusted to 70 mm with manual focus. I then switch off the camera. Will the focus change after i re-turn on the camera? Noted that focal length and zoom ...
2
votes
1answer
52 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 ...
12
votes
2answers
1k views

Does a crop sensor affect closest focusing distance? Why does it not affect focal length in EXIF data?

Since I am considering to buy the Nikkor 105mm micro VR, I wondered if the cropped sensor does affect the closest focusing distance of 0.31m? Thinking about this, the following additional (and ...
15
votes
2answers
13k views

What do “Frontfocus” and “Backfocus” mean? [duplicate]

I've read those terms in a couple of lens reviews, and not even Wikipedia has an article about it. So my questions are: What is back/frontfocus? What causes back/frontfocus? Is there any preventive ...
3
votes
5answers
213 views

How can I take portraits where more DoF appears in front of the subject than behind?

This photo has been processed, of course. More importantly, it seems that DoF is more on the front of the subject than on the rear side. What type of post-processing and lens is suitable for producing ...
3
votes
2answers
172 views

How to more effectively stay in focus with a wide aperture (50mm/1.8)?

I've been experimenting with street photography lately and - while I'm getting some decent shots - my biggest pain point is staying in focus. For example: With the following subject, I nailed a ...
1
vote
2answers
153 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 ...
-2
votes
2answers
63 views

Tips for using movie mode on DSLR [closed]

I've got a Nikon D5100 and while it takes pretty decent pictures, I have had nothing but trouble trying to use its "movie mode". This main issue I see is that movie mode only works in "Live Preview" ...
1
vote
1answer
80 views

Does focusing at infinity mean the sensor is at F?

According to thin lens optics, an object focused at infinity should correspond to the sensor position exactly at F, which is the focal length of the lens. It also means that the image of every point ...
1
vote
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 ...
6
votes
6answers
623 views

How can I meter and focus on different places of an image with a Canon DSLR?

I have a Canon 700D. I use the P mode (this way I can select a single focus point; I use the center one most times). I haven't changed any other setting. I raise the camera, focus on my subject ...
2
votes
3answers
410 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 ...
11
votes
4answers
5k views

How can a lens with a single focal length focus on more than one plane?

By definition, a prime lens is a fixed lens system with a fixed focal length. Then, simple physics tells us that it should be able to focus only on one plane (at a fixed distance) in front of it. But ...
3
votes
2answers
142 views

Why does a manual focus lens have an autofocus motor?

Can someone explain to me why the Rokinon 24mm lens has a focus motor? Quoting from LensHero's page on the lens: Generic motor built-in focus motor From what I understand, only autofocus lenses ...
10
votes
2answers
18k views

How can I take a photo with everything in focus with my DSLR?

I am quite new to DSLRs and one of the first things I noticed was the incredible focus points and depth that you can achieve. That is great in a lot of scenarios, but not in all. When filming a ...
1
vote
6answers
769 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 ...
2
votes
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 ...
1
vote
1answer
68 views

How much does a step move the focusing ring?

Does anyone know about how much a lens step rotates the lens? I’m just after an approximation for field use. In other words you are out in the field and want to shoot a stack. My goal is to be able to ...
2
votes
2answers
221 views

How to focus at several locations at once? [duplicate]

I've seen pictures with several objects being in focus and others not in focus. How do I do that? When I focus my camera, lets say along a wall, only parts of the wall will be in focus. Here is a ...
1
vote
1answer
228 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 ...
4
votes
5answers
2k views

How could I achieve stock quality sharpness?

I am using Canon 600d equipped with 18-55mm kit lens and also I bought 50mm 1.8. I am trying to take pin sharp pictures to upload them for sale.I am shooting still objects and models time to time. I ...
1
vote
2answers
172 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 ...
4
votes
2answers
180 views

Getting a completely sharp bird when it is up close

Context So I know that Depth of Field (DoF) is controlled by your f-stop (aperture opening) of the lens in question. Question Is it possible to get birds completely sharp when they are so close ...
2
votes
4answers
1k 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. ...
16
votes
2answers
28k views

How does focus work on mobile phone cameras?

How does focusing work on mobile phone cameras? Aren't their optics simple enough to not have any moving parts whatsoever? If so, how come most smartphones have an auto-focus, and with various ...
3
votes
2answers
111 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 ...
16
votes
4answers
5k views

Can software auto-detect image focus?

I was wondering if there was any photo management software out there that could auto detect and "rate" images on how in focus they are. This comes up for me quite commonly when i am looking through a ...
23
votes
9answers
5k views

How do I focus in low light for long exposures?

I've been trying to take some long exposure shots at night with my Canon 450D. The problem I'm having is that I can't seem to get a shot in focus. The low light conditions prevent AF from working at ...
4
votes
1answer
235 views

How do I auto-focus an EOS M when stopped down to kill the ambient?

I'm trying to do take some portraits with two off-camera strobes. I want a dark background, so I'm using a high f-stop and high ISO to kill the ambient, relying on the strobes to light the model. But ...
0
votes
2answers
90 views

How does aperture affect focus area? [duplicate]

How does the aperture affect the focus area? Here are some examples: With an 35mm(50mm)/f1.8 prime lens What f-value will bring a group of people standing in five rows into focus? What f-value will ...
-1
votes
2answers
122 views

Is it possible to use more than one focus point on the Nikon D3200? [closed]

When focussing with the D3200, is it possible to select more than one focus point? If so, how?
2
votes
2answers
68 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 ...
1
vote
0answers
148 views

What can I do if everything with my 55-200mm macro lens is suddenly entirely blurry and the camera won't take pictures?

I have a brand new Nikon D5500. The 55-200mm macro lens is not working properly as far as I can tell. It was acting funny the other day when I was trying to take pictures. The pictures were coming ...
1
vote
3answers
68 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 ...
0
votes
2answers
57 views

Autofocusing multi v single point at a party [duplicate]

Context I've shot at a party at night recently. I've used mainly multi point (continuous) tracking as it makes more sense, as random events may come and go. Question My friend suggests that I ...
0
votes
1answer
64 views

Good Photographs with Moto G2 Camera [closed]

I have got a MOTO G2 Mobile with 8MP front camera, usually i get best shot from my phone but is there any way so that i can capture best pictures with a mobile camera everytime?
3
votes
1answer
160 views

Pictures keep coming out unfocused

I have a Nikon D70 and it seems like whenever I use manual focus everything will look very sharp through the view finder and on the camera screen, however when I open the pictures up on my computer ...