Spring 2012

Spring 2012
by ani

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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

1
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0answers
43 views

Why does my Zorki 4 take blurred pics on infinity focus?

I've recently bought a Zorki 4 and the results I get from my test roll are quite disappointing. I've been calibrating the mirror, adjusting it for both infinity focus and close one (1 meter). Here is ...
7
votes
2answers
581 views

What are these red markings on this lens?

What do those red marking do (just to the right to the focus distances?
0
votes
1answer
56 views

Tethering to improve focusing

I use a Canon 700D, and my focus is always just a little bit off. What is the best tethering device I could use to preview on a bigger screen?
2
votes
2answers
201 views

Is there any reason you would use one-shot focus over AI-Servo?

The only one I can think of is recomposition - achieving focus and then recomposing. Are there any others? The convenience of tracking your subject seems very, very convenient - moreso than the lock ...
2
votes
1answer
44 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 ...
2
votes
2answers
75 views

Focusing mode for macro photography

New to macro photography. Shooting Nikon D5000 with 60 mm macro lens. In manual (or any P, A, S) what focusing mode should I use; i.e. Matrix, Spot or what? Are these "live" in Manual mode? I ...
8
votes
3answers
361 views

Can focus stacking (or a similar technique) also be used to reduce depth of field?

Instead of using multiple images focused at different points to extend the depth of field, can I also reduce it? Does a technique exist to reduce focal length by stacking multiple images that are ...
2
votes
2answers
39 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 ...
0
votes
2answers
47 views

Recording a maths tutorial video with iPhone [closed]

I am making a series of maths video tutorials to put up on YouTube. I have made a wooden crane that position the iPhone above my desk looking down so that it captures an A4 sheet of paper. (I have ...
11
votes
3answers
600 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 ...
6
votes
6answers
289 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 ...
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
131 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 ...
0
votes
2answers
66 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
2answers
53 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 ...
0
votes
1answer
154 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 ...
2
votes
1answer
62 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 ...
3
votes
5answers
216 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 ...
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 ...
3
votes
2answers
187 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 ...
2
votes
2answers
158 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
2answers
64 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
82 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 ...
7
votes
7answers
700 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 (...
3
votes
2answers
146 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 ...
2
votes
3answers
421 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 ...
1
vote
6answers
778 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
69 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
223 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
246 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 ...
1
vote
2answers
217 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-...
4
votes
2answers
183 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 (8....
3
votes
2answers
117 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 ...
6
votes
3answers
725 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, ...
4
votes
1answer
239 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
94 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
132 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
72 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 ...
2
votes
2answers
97 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 ...
1
vote
3answers
71 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
58 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
68 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
162 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 ...
0
votes
0answers
31 views

Technique behind miniature look [duplicate]

What is the name of, and the technique behind, images of real scenes that looks like miniatures, like the one shown here? To me, at least, it looks like a photograph of a model, not a real scene. Is ...
0
votes
1answer
99 views

Focus Issues With L-Series Lens

I have a really frustrating issue with a Canon 24-70 ƒ4 L Series Lens. I noticed that it was unable to focus at or near infinity except at the wide end (when used with my 5D Mk3). When focused ...
0
votes
1answer
104 views

Is there any way of saving this blurry photo??? [duplicate]

http://i.imgur.com/Lb9FXGe.jpg Is there ANY way to save this blurry photo? I have photoshop. PLEASE HELP.
3
votes
4answers
133 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 ...
3
votes
4answers
146 views

How can I focus quickly outdoors in the dark?

I was with my family at a seaside, late and in darkness. My nephew and niece were playing in the water and running around, and I wanted to take picture of them, but my autofocusing system was taking ...