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

23
votes
2answers
2k views

Why is infrared light's focus point different from that of visible light?

When reading about infrared photography, it's often mentioned that IR's focus point is slightly different from visible light. Why is the focus point of infrared light point different from the focus ...
1
vote
2answers
156 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 ...
0
votes
1answer
51 views

How do I manually focus my Nikon P520?

Can I manually focus a Nikon P520, and can I set infinity as well? I've looked at the manual settings and I cannot find the answer.
1
vote
5answers
316 views

35mm prime lens — photo taken is not sharp in manual focus mode [closed]

I bought a 35mm 1.8 Nikon lens and am using this lens with D3200. I placed a ball on the floor and some 100 cm from the lens. I set the lens to Manual mode and aperture to 1.8, in Aperture Priority ...
1
vote
0answers
154 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 ...
4
votes
2answers
187 views

How can I more consistently focus on the point I want?

I've had so many wonderfully composed images turn out lousy because my AF isn't as accurate as I'd like (or I don't know how to wield it). Despite using single-point AF, my focus point is often ...
2
votes
1answer
119 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 ...
4
votes
3answers
625 views

Does focal length change when I adjust the focus? [duplicate]

When I adjust the focus of my camera, in general, does this affect the focal length? I have heard that it does.
0
votes
0answers
102 views

Help!!! How can I deblur a wedding pic? [duplicate]

I have an absolutely beautiful photo from my wedding but it was taken by my cousin and is badly out of focus. :( Any ideas on how I could fix it? I'm not at all talented with computers so any help ...
3
votes
2answers
115 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 ...
0
votes
3answers
91 views

How do I focus while using an intervalometer?

Normally when I shoot 20- or 30-second exposure pictures, I use a timer--I first focus on a light source and then change the focus towards whatever I want to shoot. But this technique is not working ...
2
votes
2answers
139 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 ...
0
votes
1answer
1k views

Best AF Fine tuning for Nikon D7000 lenses [duplicate]

Over the last few months I've been noticing an annoying back - focus problem on my Nikon D7000, regardless if I was using a AF-S or AF lens. But the problem seems to happen more often on my 35mm 1.8G ...
1
vote
1answer
937 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 ...
0
votes
1answer
186 views

How do lenses focus? (and zoom?) [duplicate]

My understanding of focal length is that it is the distance from the lens to the sensor; in my observations: higher focal lengths make for longer lens. Then I started thinking about how a lens ...
0
votes
2answers
125 views

How do I prevent my camera/lens from focusing on only a subject? [duplicate]

I have a Canon 70D and am using a 50mm lens. I want to prevent it from focusing on a subject all the time. Instead, I want everything to be in focus like you get with a kit lens (18-135 etc.). I have ...
3
votes
2answers
244 views

Which focus mode should I use for a portrait shoot?

I have to do a portrait shoot for a friend. My camera (Pentax K-30) allows me to focus in the following modes: 1 focus point (center) 11 auto focus points 5 auto focus points I haven't yet ...
1
vote
1answer
107 views

Can I achieve infinity focus from Auto focus? [duplicate]

I have a 18-55mm zoom lens with no Infinity symbol on it. Let's assume I want to capture stars in night. There are three ways to do it (If I am not wrong) Use Auto focus (If your camera is able to ...
1
vote
2answers
425 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 ...
0
votes
2answers
268 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 ...
0
votes
4answers
126 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 ...
-3
votes
1answer
120 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
votes
1answer
63 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
238 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 ...
0
votes
0answers
91 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'...
0
votes
1answer
121 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
votes
3answers
200 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 ...
0
votes
2answers
119 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 ...
3
votes
1answer
307 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 ...
0
votes
2answers
312 views

What to do when NIKKOR 55-200mm lens behaves like it is not attached to the camera, even though it is attached?

I just purchased a Nikon D5500 with the 18-55mm and 55-200mm lenses, along with one digital high-def 2.2x teleconverter and a digital high-def .43x super wide angle lens with macro filter. The 18-...
5
votes
1answer
163 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 ...
3
votes
7answers
197 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 ...
1
vote
1answer
318 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
3answers
668 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 ...
3
votes
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 ...
2
votes
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. ...
3
votes
2answers
878 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 ...
1
vote
3answers
406 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 ...
0
votes
5answers
230 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 ...
1
vote
1answer
214 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
1k 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?
1
vote
3answers
631 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
72 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 ...
3
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 ...
0
votes
1answer
187 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)
3
votes
2answers
158 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 ...
2
votes
1answer
286 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 ...
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
92 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....
4
votes
3answers
175 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 ...