Questions tagged [focus]

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

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Image is Blurry, but Viewfinder is sharp

I recently bought a Canon 550D. The problems is when I take a picture through the ViewFinder, the image gets blurry and out of focus. But when I use Live Mode, the image is sharp and in focus. What ...
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Terminology for camera focus values

I am a software developer writing a software interface for a Bosch mic 9000i camera. I have an interface to change the focus of the camera and I'm writing documentation for an end user. The numeric ...
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Do my photos look blurrier on a newer, higher-resolution camera body because my lens has a problem?

I have a Canon EF 100-400 1:4.5-5.6 L IS USM (the old version, not the II) zoom lens, which I often use for bird photography. I used to have a Canon 10D body, which I used in combination with this ...
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3 answers
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Get correct focus on low light with modelling light

I'm looking for a good way to get "perfect" focus on lower light environment. I'm doing product photography (top down) of textiles with two flashes. The flashes have a model light (is that ...
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Focussing issue with Canon 90D and Tamron 24-70

A few weeks ago, I took wedding photos for a friend of a friend. A problem I had been having lately suddenly became very apparent: a lot of photos I take are not in focus. The focus indicators of my ...
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Panning - narrower focus than expected

When panning, I find that I can keep the entirety of subjects in focus when they're moving perpendicular to me -- straight L-R or R-L, as in this shot: However, I notice that when I'm panning in ...
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2 votes
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AE-Lock and Re-compose

I'm confused on how AE-lock works. I was advised and also tried this. Walk into a room point at what I want to capture, lock the exposure with AE-lock. Re-compose and take the shot. In theory the shot ...
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online image focus detection or app

I am wondering if anyone knows of an online image focus detector programme that will detect that the image is in focus without having to painstakingly go through and printing all images. I have ...
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3 votes
2 answers
3k views

Can I post process this out of focus image?

There was a small snake hiding in the grass. I pointed my camera, but I zoomed to much. When I pressed the button to adjust the focus the autofocus complained because it was out of range. I tried ...
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2 answers
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How to configure the FujiFilm X-T30 to take a selfie while holding a baby?

I'm trying to take a selfie while holding a baby, but the FujiFilm X-T30 keeps only me in focus, leaving the baby is out of focus. Is it possible with one of the auto settings to keep both of us in ...
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21 votes
5 answers
6k views

What are the best (ethical) ways to keep insect still for outdoor macro photography?

What are the best techniques to improve the details of my insects macro shots ? I don't want to kill them, and ideally, would like to use some focus stacking. I shoot handheld (with a Laowa 2X), with ...
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1 vote
1 answer
124 views

D7200 no longer autofocusing

AF on the body of the camera M/A on the lens Back dial is not locked I've tried clicking and holding the AE-L/AF-L button Tried two different lenses Battery is full In the viewfinder, I see two arrows ...
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Auto focus won’t work in viewfinder on Aperture priority mode

My camera (Canon Rebel t7i) won’t auto focus in manual or aperture priority mode in viewfinder. (It works perfectly in liveview) Maybe it’s important to say that I’ve never shot in manual mode so I ...
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4 answers
510 views

Why I am unable to focus at all while using ND filters

Lately, I am unable to focus with ND8 AND ND10 filters put over the kit lenses of my Canon1300D camera. Whenever I try to focus, it allows me to only reach to a point where the subjects are only ...
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1 vote
1 answer
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How to calculate depth of field at different resolutions

I have a DSLR (EOS 60D) and I use hyperfocal pro when setting up astro-photography. At lower resolutions though, such as in video mode, how can I calculate the depth of field? The field of view barely ...
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2 answers
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How can I measure the exact range of focus of a given fixed focus webcam?

By moving objects around the camera I can see that they get very blurry at 10cm and less sharp at 3-4m away from the camera but how can I measure the exact range of focus? If I check the sharpness of ...
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0 answers
117 views

Nikon D5300 pictures are coming out blurry

When I'm taking pictures in Autofocus on my Nikon d5300 the subject's face comes out blurry. It's not the camera shaking, the shutter speed was on 1/200. It didn't help to zoom in, however, when I ...
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15 votes
4 answers
3k views

How do I tilt a lens to get an entire street in focus?

What is an efficient strategy to get a particular plane in focus by adjusting: the tilt (or in the example below, the swing) the focus distance (or rather the focus angle, for a tilted lens)? I'll ...
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1 answer
146 views

K10D poor focus - manual or auto - with full-frame zoom lens

I'm getting very poor focus particularly at the long end of an 80-320mm tele lens that I am using with my Pentax K10D. The lens was originally bought for my 35mm Pentax SLR (maybe an MZ5 or something, ...
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1 vote
1 answer
229 views

Dismissing red frame in close up [Canon EOS M50]

Is there a way to take a shot even though the red frame indicating out of focus appears? When I am trying to take a picture few inches away from something the red frame appears. Someone asked similar ...
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5 votes
4 answers
1k views

What causes images to have flat depth?

I am learning about photography and I remember reading about an effect that causes images to look like there is no depth but now I cannot find what it is called or what causes it. I remember an ...
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2 answers
129 views

Would a screw in 2x converter double the minimum focusing distance?

I want to shoot some very zoomed in shots, my current lens has a 28cm minimum focusing distance. I want to shoot from 35-40cm away but more zoomed in. Sort of macro, but from a distance. If I bought a ...
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1 vote
2 answers
178 views

Focus problem with Opteka 500mm mirror lens

Ok, I'll lead with the fact that I know this is a cheap lens and they're notoriously difficult/impossible to focus well. But ... something is strange here. I took this lens out to try and get some ...
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2 answers
107 views

How to properly focus using a Macro reverse ring?

Fourth question from me about this topic. I'm trying to digitize a large number of family slide films with a modified slide projector by taking photos of the slides (I replaced the original yellow ...
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1 vote
1 answer
302 views

Picture gets blurry when zooming in

My Nikon 3400's kit lens(18-55mm) works fine when I take pictures at 18mm. But when I extend lens beyond that, the picture gets blurry(no clarity). Though I can focus on extremely close distances ...
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1 vote
1 answer
603 views

Err 01 and no manual focus (Canon lens)

my Canon EF-S 18-55mm f/3.5-5.6 IS STM just stopped communicating with my DSLR (Canon EOS 77D). Furthermore, I can't even use manual focus anymore. Right before this happened, I tested some extension ...
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4 votes
2 answers
345 views

Modifying a film camera to display images

My dad passed recently and I would like a way to memorialise him and his photos. He was an avid photographer and never left home without his camera. The one I remember from growing up was an Asahi ...
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1 vote
1 answer
154 views

How can I produce high quality images of field ranges for training sets?

I am an Agronomic researcher assisting on a ML problem for identifying soy diseases. I would like to capture an image of a single range of soy (roughly 1' wide by 5' long) that is at least mostly in-...
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1 vote
1 answer
90 views

Mounting large format lens on PB-4 Bellows

I have a PB-4 bellows. I want to mount a large format lens on the bellows so it can focus to infinity and I will have a very versatile tilt/shift bellows. So I am just wondering if there are any ...
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8 votes
8 answers
4k views

How can I get sharp bird photos when the bird is further away?

I have Canon 1200D. I use the 55-250mm kit lens for bird photography. Laughing Dove ISO 400, 1/100, 250mm, cropped, shot late in day in overcast conditions, brightness increased in post processing ...
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4 answers
407 views

Focussing on a star with wide angle 14mm lens

Has anyone discovered a better way than trial and error to focus on a star - (for Milky Way Astrophotography)? I am using a Canon 5D Mk2 with a 14-40mm lens at 14mm. My Settings are ISO 12800 and ...
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3 votes
3 answers
306 views

Why can't I reproduce a back-focus problem at home?

I'm a bit out of ideas. Lastly, my Nikon D7000 started to have severe back-focus problems. When I shoot photos of birds and other animals, or portraits of persons, in average, four out of five photos, ...
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2 votes
1 answer
163 views

Shutter activates when manual focus is achieved. How?

I have a canon 5D mk ii which I've been using for donkeys year. I was messing about with a new lens in the office today and somehow stumbled on a feature I've never noticed before. Using manual focus, ...
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2 votes
2 answers
471 views

Canon 250D not focusing on Self Timer [duplicate]

I want to take some smart photos of myself with my Canon 250D. I have it set to 18mm so I can stand a bit away from the tripod. I then put the camera on a 10 second self timer. Eye AF is on. When I ...
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2 votes
5 answers
297 views

Can digital zoom affect focus

I was always under the impression that digital zoom has little use since the same thing can be achieved on a computer afterwards by cropping. I recently purchased a point & shoot digital camera ...
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1 vote
3 answers
126 views

Is the sharpness of imaging different within the depth of field?

Is the sharpness of imaging different within the depth of field? Where is the sharpest? What I am asking is the distance from the lens to the object, not the image distance in the lens. How to ...
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3 votes
3 answers
270 views

Distant objects not in focus

This is almost certainly my fault, not the camera. I mostly shoot landscapes with myself in the foreground via a small tripod: My former camera was a Sony A5000 and for these kinds of shots (see ...
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1 vote
2 answers
73 views

Convex lens, object distance, distance, focal length, in what state is the hyperfocal state? [closed]

Suppose we have a convex lens for a middle school physics experiment, a screen, and an object being imaged, under what state will we find the hyperfocal state? The screen is the imaged screen. It can ...
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1 vote
2 answers
177 views

Using a modern lens (with electronics) manually?

Long story short: What I have: Panasonic GH4 Endless 3D printing options for making my own adapters Very, very nice japanese retro prime lens from almost 50 years ago (yeah, it really looks ...
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6 votes
3 answers
255 views

What is this style of photography called?

I am trying to learn a specific type of photography and am having a difficult time finding out the name for it. What I am most interested in, is a specific niche of high focus, minimalist, black ...
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3 votes
5 answers
592 views

Focussing with Extension Tubes

I bought a set of extension Tubes to use with my Nikon D5300 and 35mm f/1.8 lens. However, it seems that the only option to focus is to change the distance to the subject. This is very inaccurate and ...
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0 votes
2 answers
334 views

Why is my Nikon D5500 unable to lock focus while using Live View but works fine when using the ViewFinder?

It just keeps trying to find focus. If I press the half-click focus button I hear the motor moving and the numbers on my lens go from smallest to infinity and stop. If I press the half-click focus ...
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-2 votes
2 answers
203 views

When the object is 50 meters away, how do you know that the camera is focused at a distance of 50 meters?

When the object is 50 meters away, how do you know that the camera is focused at a distance of 50 meters? Is it that we can only focus at about 50 meters?
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-2 votes
3 answers
384 views

What is the acceptable CoC (Circle of Confusion) of the human eye to directly observe the object? [closed]

What is the acceptable CoC (Circle of Confusion) of the human eye to directly observe the object? The human eye has many cells and high pixels. Should the permissible circle of confusion be small?
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5 votes
2 answers
616 views

Is there an effect opposite of tilt-shifting?

Is there any effect that would make objects seem much larger than they actually are? I tried to google for it and the only thing I could find was a discussion on flickr where focus stacking is ...
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-3 votes
1 answer
107 views

For the formula 1 / u + 1 / v = 1 / f, what is infinite depth of field or hyperfocal distance?

For the formula 1 / u + 1 / v = 1 / f, what is infinite depth of field or hyperfocal distance? In other words, when u, v, and f, we have infinite depth of field or hyperfocal distance?
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1 vote
2 answers
196 views

What does focusing mean? What does it have to do with the formula 1 / u + 1 / v = 1 / f?

What does focusing mean? What does it have to do with the formula 1 / u + 1 / v = 1 / f u is the object distance, v is the image distance, f is the focal length. Does focusing mean that both ...
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  • 155
0 votes
1 answer
54 views

Measuring Change in Focal Length

I have a Nikkor 28mm f/2.8 prime lens. I understand that this focal length is only valid when the focus is held at infinity. Is there a way to easily measure how the focal length changes when I adjust ...
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0 votes
2 answers
94 views

Selective focus optical illusion [duplicate]

I have come across some shots from other people and they create something like an illusion to me and trick me of the scale of the actual scenery. For example, this shot by @chuttersnap on Unsplash ...
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2 votes
3 answers
212 views

Is the hyperfocal distance calculation outdated?

The hyperfocal distance H is calculated by H = (f^2)/(N*c)+f where f is the focal length, N the f-stop and c the circle of confusion limit. Lets assume we use a fullframe sensor. All those calculators ...
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