Shadowy Daisy

Shadowy Daisy
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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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3answers
639 views

Auto focus vs Single Continuous/Point focus

I'm using a D600. Sometimes, having the ability to select my focus point is good. However, in certain situations, moments can be lost when you're framing or moving the focus point to the subject in ...
5
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3answers
363 views

How do waterproof lenses focus underwater?

Our eyes need air in front of them to be able to focus properly, that's why when we go swimming using goggles, our surroundings are much clearer than without. So my question is, how do waterproof ...
5
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1answer
462 views

Is it possible to get tethered focus and aperture control with any current DSLR?

I'm looking to get into some photography work and I had a couple questions. I'm quite an amateur at this, unfortunately, so I would appreciate any and all assistance! I want to be able to control the ...
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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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1answer
234 views

1/30 shutter speed with film camera

If you take a photo with a 1/30 shutter speed, but the objects in the photo were not moving, will the picture appear blurry? Or will they appear clear?
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1answer
250 views

When should I consider an image sharp? [duplicate]

Recently I am worried about the functionality of my Pentax K-50, i.e. I am not able anymore to get real sharp images. Thus my question arose, what I should see as "sharp". So I took several pictures ...
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2answers
254 views

How can I focus on the moon [duplicate]

I'm technically a beginner when it comes to anything other than point and shoot photography so I apologise if I don't explain myself clearly. I have a Pentax Q with an 85-200mm K lens, I'm using a Q ...
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2answers
709 views

How does auto focus tracking work in DSLRs

I thought auto focus tracking comes from the computation of image on the image sensor when I was using GF1, a MILC. The auto focus tracking was good. However when I use canon 6D, a DSLR the auto focus ...
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2answers
2k views

Is it normal for focal length to change while focusing?

When I change the focus distance on my Pentax 55-300mm lens, the focal length appears to change. More specifically, the lens appears to zoom in as I focus towards the minimum focusing distance. This ...
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2answers
237 views

does depth of field travel with the focal plane?

for simplicity it can be assumed all of the following discussion is relative to a prime lens i recently learned about the technique of hyperfocal distance focusing. that is, by using the method to ...
2
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1answer
388 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 ...
0
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1answer
247 views

Noise reduction before or after deconvolution?

NR before or after sharpening has been asked and answered, but deconvolution is much more complicated than simple USM. Many deconvolution algorithms have their own methods of handling noise, so I'm ...
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1answer
126 views

Which mirrorless have the best live view for night photography?

Which mirrorless camera are best suited for focusing (manual is OK) and framing in low-light? I have an Olympus e-pm2, and I can't see anything on the LV when its really dark, and have to resort to ...
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2answers
685 views

Focus in night photography

Another question related to the Olympus OMD EM5. I bought this camera to replace my Nikon D90 and I'm very satisfied with it. However, I find very hard to do the focus at night. With the Nikon D90, ...
9
votes
2answers
7k views

How do I determine focus points in Adobe Lightroom?

Not sure if this is possible or not in Adobe Lightroom. I would like to see the focus points chosen by my Canon DSLR. I am guessing this is stored somewhere in the EXIF, but I'm not certain. I find ...
6
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3answers
2k views

I'm having trouble getting sharp pictures while shooting a concert from a press pass location

I am a bit of a noob when it comes to photography. But I recently got the opportunity to shoot John Mayer this past weekend in Wisconsin. Upon getting home, I noticed the pictures weren't as sharp ...
4
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1answer
265 views

Is the distance scale on a lens linear?

I have Nikon lenses with distance scales on them so I can set the lenses to the hyperfocal distance when I need. Say now the focal length is 28mm and the aperture is f/16. The corresponding ...
34
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7answers
3k views

What is “Hyperfocal Distance”?

I'd like a clear & easy-to-understand (especially for non-physics-types) explanation of what Hyperfocal Distance is, how it affects photographs, and what determines its value.
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1answer
937 views

Sony 3.5-5.6/18-55 SAM (SAL1855) lens broken

I have a Sony 3.5-5.6/18-55 SAM (part no. SAL1855) lens that has taken a knock and the zoom ring is now stuck fast at 55mm and the focus ring doesn't want to pull all the way in. Are there any guides ...
5
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1answer
1k views

How do disposable cameras work without exposure and focus control?

Before I got into photography, I used to use disposable cameras with ISO 400 film. I've gotten some decent results in various lighting, both inside and outside and at different focus distances. How do ...
3
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1answer
186 views

Why is it harder to focus using LiveView?

I have a Canon EOS 650D with 18-135 f/3.5-5.6 IS STM. When shooting in LiveView, I find it harder to achieve focus when it's in the dark, and sometimes it can not lock focus despite my touching the ...
2
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2answers
423 views

How to focus manually with a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens?

I have a Nikon D3100, for which I just bought a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens. This is a CPU lens and works very nicely in auto-mode, i.e. when you let the camera set the focus. ...
9
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1answer
663 views

Why is the Canon MP-E 65mm F/2.8 Macro Lens not called a zoom?

The Canon MP-E 65mm works differently than my other macro lenses. Compare: With a standard 35mm macro, I can frame first and then adjust focus which only changes framing very slightly with. With the ...
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votes
1answer
137 views

Why do my photos appear more in focus when I use a long exposure? [duplicate]

Why does an unfocused lens still give a focused view with a longer exposure? For example, I took an out-of-focus photo with a ¹⁄₁₀th second exposure (at f/7.1), but when I change to 10 seconds (at f/...
3
votes
1answer
257 views

Do lenses have focal planes or focal spheres/ellipsoids?

The title says it pretty much all. I'm asking this because I find myself always using the focus point in the center, and after I focused, I rotate my camera to make the framing right. However, if ...
3
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1answer
3k views

Nikon D5100 Focusing Issue

The issue I have had is where the camera tries to focus and cannot focus. It just zooms in and out constantly and no matter what I do it will not focus and fire. The only way I have found around this ...
0
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1answer
137 views

Why does the focus light come on in manual focus mode?

When I'm in the manual focus mode, I find that the focus light (the red blinking light) sometimes still comes on before it takes a photo. Why is this? I thought the purpose of the light is to ...
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2answers
361 views

How can I increase the amount of 'keepers' from my Nikkor 50mm 1.8D

I have been using this lens for a while, mostly for portraits and have noticed that for some reason the outdoor pictures where I most likely had to quickly compose and take the shot have had something ...
8
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3answers
9k views

What is the technical difference between focus and zooming?

This may look like a silly question but I don't know what the difference between zooming and focusing is. Zooming in will usually let me have fewer subjects in the scene while zooming out will allow ...
3
votes
3answers
298 views

Precise focus information in metadata

I am trying to get the precise focal length used for a stack of photographs taken with various focal length. See the following link. My problem is that even if the photographs are obviously focusing ...
2
votes
2answers
230 views

What determines the sharp parts in an image: the DoF or the focus point?

I am a little bit confused between depth of field (DoF) and focus points. Which of them is responsible for making part of the image sharp?
0
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0answers
58 views

How to get accurate focus at night? [duplicate]

I've tried focusing shots at night, but never get a perfect click. Are there any tips that might help?
4
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2answers
176 views

Light-field shots entirely in focus?

A light field camera can be used to make shots which can be truly refocused after the shot, however if I understand the technology correctly it would be just as easy to process the "image data" in ...
0
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2answers
232 views

Wide aperture in low-light results in muddy image on Powershot G16?

I have a Powershot G16 that I'd like to use as my standard camera for its light weight. It takes amazing photos in the day, but I'm having some problems with handheld at night. I'm still a photography ...
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3answers
332 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 ...
1
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1answer
483 views

How can i get AF confirmation working with Samyang 500mm f/6.3 with dandelion chip?

I've put a dandelion chip (4th gen) on my Samyang 500mm f/6.3. I shoot a Canon 6D by the way. So, that's cool now I've set the chip to return f/6.3 and I can get a correctly exposed LiveView, EXIF ...
3
votes
3answers
608 views

Do focus area modes matter if shooting in manual focus?

It seems my camera lets me change the focus area modes (e.g wide, center or spot) even when I am shooting in manual focus so I am trying to understand if area modes matter even if the camera is in ...
0
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2answers
3k views

Nikon d7000 will not auto focus

Nikon D7000: When I press down on the shutter release my camera does not auto focus with any lens. I have checked and it's NOT on manual I have tried resetting my camera I want to shoot nightlife so ...
1
vote
1answer
92 views

Is there a way to avoid focus searching? [duplicate]

While using my camera in a relatively low light scenario I noticed some shots I missed because my camera was struggling to focus. I use a Nikon D7100 and noticed that the AF assist light only came on ...
1
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2answers
1k views

Why does my Samsung NX1000 zoom way in when manually focusing?

I bought a Samsung NX1000 this week, and I have the 20-50mm lens. However when I put it on manual focus, the picture keeps jumping from standard zoom to "mega zoom" — it zooms a lot further in then ...
2
votes
2answers
2k views

What is the difference Focus mode and AF-Area mode?

I am using Nikon D5100. To shoot a subject which is: Stationary: we can set AF-area mode to Single Point AF we can set Focus mode to AF-S Moving: we can set AF-area mode to Dynamic-Area AF we can ...
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1answer
1k views

What is the purpose of Quick Mode focusing in live view?

What is the purpose of Quick Mode (found on some Canon DSLRs) focusing in live view? To me it seems like a bad blend between live view and viewfinder mode that really doesn't cut it. Of course it's a ...
2
votes
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-...
1
vote
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? ...
1
vote
1answer
416 views

Why do I see different focuspoint in my DSLR's viewfinder and screen with old lenses?

I've had an old completely analog Praktika SLR with a set of lenses for a few years now. The camera and lenses are still quite good but I wanted to go digital. Having recently acquired a Nikon D5200, ...
5
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1answer
227 views

Which lenses show 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 ...
2
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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 ...
17
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2answers
2k views

What makes the focus ring on a lens go smoothly?

I’m curious about the smooth movement of the zoom or focus rings on a lens. How is the smooth movement done? Is there some kind of liquid with high viscosity? That doesn’t sound very probable. On the ...
20
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7answers
12k views

What are the biggest issues with wearing glasses as a photographer and how can they be overcome?

To be clear, I'm talking about the photographer wearing glasses. I wear glasses and I find that I continuously need to make sure my glasses are pushed up on my nose and that having things at the ...
16
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1answer
993 views

What is a focusing rail?

In What are the best practices for DOF stacking? I noticed a mention of a "focusing rail". I've never heard of such device. What is it, and in what circumstances is it useful?