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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3answers
198 views

Reason for offset in lens/sensor and tripod mount?

I have noticed that my Canon Powershot G11 tripod mount is more in the center of the body of the camera and not aligned with the lens/sensor. Is there a reason for this? My concern is that as I rotate ...
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1answer
122 views

Why is there a maximum focus distance when using an extension tube? [duplicate]

I am using the Nikon D850 together with the Sigma 50mm/1.4 Art and the MEIKE MK-N-AF1-A extension tube(s). During first shots I found out that the combination not only has a minimum focus distance (...
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291 views

Are electronically parfocal RF lenses parfocal enough for fireworks photography with zoom?

Within a month or so, it's the first time I'll see fireworks as an owner of a good camera and naturally I'm planning to take photographs of them. By researching various fireworks photography sources, ...
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0answers
108 views

Is there any benefit of “continue focus search” option?

Many Canon DSLR / mirrorless cameras have an option to choose whether the camera searches for focus if it cannot find focus. Especially on long lenses with no focus limiter, the lens can become ...
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5answers
226 views

Is it best to use a wide aperture when I'm focusing at infinity and depth of field is not a concern?

If I shoot at f1.4, I can easily separate my subject from background due to the shallow DoF. In the case where I turn the focus to infinity at f1.4, I will have everything in focus, except the ...
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6answers
206 views

Can we prove that the object is not tilted from photo(s)?

This is an image of Al-Masjid an-Nabawi. Can we from this image, or from combination of images available online say with a certain degree of confidence (prove?) that this red circled minaret is ...
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0answers
62 views

AF Fine-tune zoom lenses?

How do you fix / fine-tune the focus on a zoom lens? Nikon states The D850 can fine-tune autofocus automatically. The results can be used with all lenses of the same type. But does it also mean ...
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3answers
122 views

Focus in Analog and Digital Cameras [duplicate]

Why a subject not in focus in the viewfinder of an analog camera is seen as two misaligned half circles, while in that of a digital camera is evenly blurred?
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5answers
4k views

Why can't my custom camera body focus to far distances?

I have built a custom optical device that uses a standard C-mount lens as found on CCTV cameras. Wikipedia states that the flange-to-film distance of a C-mount lens is 17.526 millimetres. I have ...
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3answers
141 views

What affects tripod stability?

I have a Vanguard Veo 2 265 CB tripod. I really like it and it has been performing, but lately I am trying to get my pictures as sharp as I can get and I noticed something. It must be trivial to ask,...
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4answers
95 views

Would it be viable to use my camera as a low power microscope?

I sometimes do pcb soldering and it is useful to have a microscope on hand with zoom of anywhere between 7x-12x to view the tiny components. I don't really want to spend several hundred dollars on a ...
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1answer
70 views

Back-focusing with Canon 7D2 body and Sigma 50mm art lens: is the Sigma USB dock the solution?

I just bought a second hand Sigma lens (50mm Art f/1.4) for my Canon 7D2 body (Mark II). This combination yields a very serious back-focus problem: With no micro-ajustements correction on my body, ...
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2answers
87 views

How to focus old manual viewfinder cameras?

I recently got two really old cameras, and I'm lost. The cameras are an Agfa Silette, and a Welta Weltax. I expected the cameras to have a focusing mechanism similar to rangefinger cameras, or split-...
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108 views

Nikon D5200 no longer focuses

It used to be that on my Nikon D5200 camera holding down the shoot button halfway the viewfinder would show green dots and it would focus nicely. Now after resetting the camera settings, replacing ...
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2answers
90 views

Focus issues even when using Single-Point [duplicate]

I have been noticing, even if I use AF-S with Single-Point focus and set the focus on the eye of the bird, still the final photo either comes out blurred or has less details. Someone in a response to ...
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6answers
8k views

Why aren't faces sharp in my f/1.8 portraits even though I'm carefully using center-point autofocus?

I love my Canon Rebel T6 and take portrait pictures in Av mode with a 50mm in 1.8 Av. I'm using auto focus in the 'focus on center point' mode. I make sure that the center point focuses on the face so ...
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2answers
128 views

How do I find infinity focus with a kit lens when there's not enough light for optical verification? [duplicate]

I have a D7200 which I want to use at long distances in low light photography. The kit lens, a 18-140 does not have focus markers on it. Furthermore, the focus ring does not stop hard at any point. ...
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2answers
110 views

How can a subject stay in focus if the shot is recomposed afterwards?

I have a doubt about a procedure that I see many photographers continuously apply and they taught me. I see that, when they want to take a picture with their reflex, they do this sequence of steps: 1)...
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2answers
139 views

How to set focus when subject is more than one object?

I have taken a photo with men dancing in a group. It was rejected by an agency stating: "The main subject is not in focus and grain noticed in the photo". Below I am giving the cropped image. Since ...
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3answers
115 views

How to identify main subject of the photo and set focus?

I am using Nikon D5600. While on street photo shoot, I clicked a couple of photos and submitted on one of the stock photo website. Few photos got approved whereas few were rejected with a comment. ...
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2answers
186 views

What makes these white stars appear black?

This is partial screenshot from an episode of the TV (Netflix) show Daredevil (season 2, episode 7): Note how the normally white stars of the US flag are showing up as black - albeit quite out of ...
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4answers
288 views

How do fixed lenses “focus” on things at different distances? [duplicate]

I'm trying to understand depth of field and I'm struggling. If I'm playing with a 50mm fixed lens, and I alter its focus using the little ring around the lens, what is actually changing in terms of ...
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2answers
197 views

Why do I get so many unsharp pictures with my Canon 70-200 IS f/2.8?

Please take a look at the picture below. You can see where the focus point was thanks to a LR plugin. But the image is unsharp - again. And yes, I'm sure the dog was standing still enough for 1/250 ...
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1answer
178 views

Focusing issues on live view - Nikon D750 w/ AF-S NIKKOR 24-70mm f/2.8G ED

On a heavily used Nikon D750 w/ AF-S NIKKOR 24-70mm f/2.8G ED: When using live vision, ussualy while holding the camera up over my head, autofocus focuses nowhere. This happens right after having ...
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2answers
94 views

Is minimum focus distance (MFD) really minimum?

On my prime lense the barrel shows the "minimum" focus distance (MFD). According to the definition you find on internet you cannot focus an object closer to this distance (measure from the sensor ...
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1answer
25 views

Canon EOS80D would not focus [duplicate]

While in manual mode with auto focus, could not get the camera to focus for night astrophotography. Tried different combinations of ISO, TV and AV. I noticed that the EV was all the way to the right....
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2answers
110 views

When using Back Button Auto Focus, do I release the button before shooting a sequence, or hold it down?

When shooting moving subjects (Sports), am I suppose to keep the back button AF pressed during a sequence of shots? Or do I press til it focuses, and then let go and shoot a sequence? Thank you in ...
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4answers
133 views

Can hyperfocal distance be used to keep everyone in focus in group photography?

If you have different sets of people standing at different linear distances from the camera can we use the theory of hyperfocal distance to ensure sharp focus on all subjects? Conversely does being "...
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1answer
95 views

What is the Job of second lens in dual camera Mobile phones

Somewhere I read that two lenses are required to create a DSLR effect- Blurring the background. But today I read, the Aperture size is responsible for blurring the background, So any lens (single ...
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2answers
111 views

DSLR lens image inversion?

 Out of simple curiosity, do DSLR cameras produce an inverted image on the sensor, with the image being flipped by software?  I've dabbled with astronomy prior to my current interest in ...
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3answers
114 views

Is there any mirrorless camera that can mark areas within DoF in the EVF?

All mirrorless cameras have the image in the rear LCD and the electronic viewfinder (EVF) fully generated by a computer, making many utilities such as noise removal, text overlays, histograms, etc ...
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2answers
170 views

Would adding an external lens allow one area outside the focal plane to be in focus?

I’m doing high speed scientific imaging. I have a camera mounted in a fixed location with a Micro Nikkor 105mm lens. It’s viewing a fixed subject that has a small mirror oriented 45 degrees underneath ...
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1answer
83 views

How can I tell whether or not a lens has focus breathing?

So recently I got a 90mm macro lens, installed a focus bracketing app onto my camera and let it run. Unfortunately, turned out that this lens has focus breathing which means the actual zoom level in ...
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2answers
297 views

Is the Canon EF 24-105mm f/4L IS USM lens parfocal or not?

I read a review of the Canon EF 24-105mm f/4L IS USM lens. It said: Focus shifts while zooming. Zoom before you focus. Surprised by this (I don't recall ever seeing the focus scale shift while ...
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3answers
234 views

Does image quality of the lens affect “focus and recompose” technique?

As I understand it, 'focus and recompose' is often used to ensure the subject is in focus and at the same time composition is right. It has been estimated that some lenses are best in terms of image ...
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2answers
104 views

Is this the limit of the camera image quality or is the subject out of focus?

I'm using the "macro" mode in the Powershot G9X II. The macro mode is simply a shorter focus range, there is no magnification in place, like in aftermarket macro lenses for DSLR's. I've shot many ...
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1answer
95 views

What units are used for zoom and focus distance for the varifocal Dahua camera? [closed]

I've been working with an industrial Dahua camera and since I do not have a full model of how the camera works (and because I'm a complete newbie to cameras in general), a few elements are still ...
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2answers
216 views

How to perform non-center focusing using common film SLR camera?

I have a Nikon FM2 camera with Nikkor 50/1.4D lens. Is there a way to focus on the area that is not center? This can be easily done with digital camera as Nikon D750, where we can just use focus ...
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2answers
362 views

How to find an angle and a distance for clicking picture of a distorted artwork to achieve 3D effect?

If you know about 3D pencil artworks, you would know people draw it distorted (generally length is enlarged i.e., stretched from bottom to top) first and then click a picture at some angle (30-40 ...
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1answer
121 views

Everything in focus with d750 [duplicate]

as you can see the flowers are not focused, I cannot focus everything, I have to chose the squirrel or the flowers, is it normal? THANK you D750 28-300
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2answers
196 views

New camera won't focus while zoomed in, old one focuses perfectly. Why? [duplicate]

I take photos of computer hardware for sale on ebay. I had been borrowing a camera for photos (Olympus SZ-16) and the camera will be able to focus while very zoomed in to a device while relatively ...
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1answer
592 views

How can I preview depth of field on my Canon M50?

I recently bought a Canon M50, and it's actually my first time ever taking pictures with a camera other than my phone, so I'm super noob. Today I was playing around with my M50, trying different ...
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2answers
732 views

My camera won't focus on close objects [duplicate]

Hi my EOS 6d mark ii camera will not focus when I am trying to get a close up photo but will focus on a far away object. Please help.
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3answers
172 views

Why is that the wider the aperture of a lens is, the more we can see through narrow cracks and crevices?

Example I took at 85mm f/1.4 on APS-C sensor:
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1answer
72 views

How do adjustments to flange focal distance affect front focal distance?

I am using a Nikon Micro-Nikkor F-mount lens with 105mm fixed focal length in a custom optical set-up (F-mount adapter to custom optics). This means that my flange focal distance is only an ...
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3answers
76 views

Are focus-peaking MF and contrast-based AF susceptible to being misled by metallic reflections?

Wondering about some shots that went wrong, which were shot with focus peaking and manual focus, and where there were metallic/mirror-reflective highlights (think scenes with crumpled car wrecks or ...
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4answers
2k views

Is camera lens focus an exact point or a range?

I have often wondered if the focus of a lens at a particular focal length is an exact point or a range within a few millimeters. This becomes all the more important when manually focussing. How far ...
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3answers
165 views

Is it normal to see focus inconsistency frame-to-frame with an f/1.4 lens?

I have the Nikon Sigma 85mm 1.4 and I've noticed some inconsistency with focus. I setup a tripod, and a lens calibration card in an attempt to micro adjust the focus. However, what I noticed was that ...
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1answer
96 views

Mavic Pro 1 Infinity focus problem

1 Hello everyone, I am very new to flying drones. I have bought a second hand Mavic Pro 1, and it has this strange issue of focusing at night. Whenever I try to focus to infinity to get a broad DoF, ...
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3answers
630 views

What is “focus distance lower/upper” and how is it different from depth of field?

I have taken two photographs on a Canon crop sensor camera: 18mm f/9 with the following exiftool output (the focus was approximately at 3.5 meters): Focus Distance Upper : 5.27 m Focus ...