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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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Is it necessary to use focus point selection if i use back button focusing?

I'm a beginner in photography who just started using back button focusing. Any help would be very appreciated!
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2answers
34 views

Focussing 100mm Auto Bellows Minolta lens on Bellows I with slide duplicator

I have a Minolta Auto Bellows 100mm lens (no focussing functionality, just aperture), that I am trying to use to duplicate slides with a A7R III and Minolta bellows I, focussing rail and slide ...
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77 views

Nikon AF-P 70-300 4.5-6.3G ED - very hard to focus

I have the D5600 with the 18-55 kit lens and the AF-P 70-300 4.5-6.3G ED (non VR). With the 18-55 I have no issues; but when I put the 70-300 it starts to make a sound, like if the focusing motor ...
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49 views

How to enable back button focus on a Canon EOS 1300D?

I have recently switched cameras to a Canon EOS 1300D and I am unable to find how to enable back button focus. Does anyone know how to enable it?
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77 views

Focus Mode issue with the Nikon 7200

It is my understanding that to change the Focus mode you press and hold the AF - Mode button next to the lens and then rotate the knurled dial on the back of the camera. Then you select your desired ...
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246 views

Is there really a trend of portraits where the subject is not in focus?

My wife told me is a trend to aim out of focus on portrait shot. Maybe like focus on the background and let the main subject look blurred. Is there such trend? What kind of photography is this? Anyway,...
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98 views

Focus on near eye in backlit situation

As far as I am aware, for a portrait of a single person, focus should be on the eye closer to the camera, as a rule. Does the same apply in more or less backlit situations, i.e., when the near eye is ...
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419 views

Why use ultra-wide with short focus?

I have a Samyang F/2.0 12 mm for the Sony E Mount, so the 35-mm equivalent focal length is 18 mm (crop sensor 1.5×). I use it mainly for landscapes and architecture in order to fit more in my frame ...
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144 views

Are all prime lenses designed so that the same DoF scale applies at any focusing distance? If so, why?

This question is about the mapping between the angular position of the focusing ring and the focusing distance. This mapping could be anything but the design of prime lenses seems to be such that a ...
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4answers
183 views

Why does this thin plate disappear when changing focus

I am photographing a very thin plate (0.01" thick) that is partially submerged in a tank of water. My goal is to find the angle that the water surface makes with plate. When I focus on the front edge ...
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1answer
79 views

Focusing techniques with old folding camera (Agfa Isolette/Jsolette V)

I inherited one of these from my grandmother recently. Bought new in Romania in the 1930s or 1940s, can't remember. Anyway, I've been shooting all kinds of films with it, and have gotten ...
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3answers
130 views

How can I focus on someone who is in motion and still get them in focus with a wide aperture?

I'm trying to figure out the best technique to use for photographing people in motion. I would love to do weddings one day - but for now I’m concentrating on just getting my focus down (with a very ...
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69 views

DSLR cannot focus after short drop

Have an old Canon 300D which suffered a drop onto hard floor from less than half a metre. It was in a bag, with a lens attached, and there is no visible damage. However, it seems to have lost the ...
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169 views

Wondering about the metering mode and focus area? [closed]

I just learn about the metering mode and focus area on youtube. But i am wondering about are they on at the same time? I got a sony a6300 camera.
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2answers
93 views

Pentax K-x with kit lenses problem producing sharp photos [duplicate]

Hey guys I have recently dug out old Pentax K-X with kit lenses, but I noticed I struggle with sharpness of the photos. No matter what settings I try I get my photos blurry when I crop it to make ...
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81 views

How to accurately determine the size of a nearby object (~15cm) using the autofocus focus distance?

The problem I'm trying to determine the size of an object using the focus distance determined by the autofocus of a smartphone camera (Galaxy Note 8). But I don't seem to be able to get an accurate ...
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122 views

Is it normal for focus to “drift” in timelapse mode?

I use a Canon 77D with a 24mm 2.8 STM lens. If I set the camera to back-button focusing, focus, then take a short series of shots, everything looks fine. But if I leave the camera in timelapse mode (...
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Focus highlighting thumbnails

Is there any software that will analyze the photos in a directory and create thumbnails with the areas most in focus highlighted in color? I know my camera (Sony a99ii) can do this real time. It ...
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242 views

My DSLR's autofocus doesn't work after I dropped it — how can I narrow down the problem?

If I try to focus by the shutter button the image doesn't change, even in live view (and I'm not be able to shot a picture). But if I hold the "AE-L/AF-L" button and click the shutter button I'm able ...
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1answer
292 views

Panasonic Lumix TZ100 - how to stop autofocusing and just get everything in equal focus?

I’m an amateur photographer and would like to ask for some help! I’ve recently bought a new camera, a Panasonic Lumix TZ100. Before that for 5 years I was using a Canon Ixus 255 HS. So far I haven’t ...
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128 views

Manual focus in A mode can harm my lens? [duplicate]

I use 18-140 Nikkor . This lens have two A & M focus mode and this lens is AF-S that mean when auto focus is enable the focus ring dose't move. If i do manual focus when the lens is at A mode , ...
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163 views

Manual focus lens on fixed focus camera?

Hello i have bought this camera: It is a lens type camera, but it has a FIXED focus. I read on the internet that if I buy and put a manual focus lens it will work? Is that true ? If it is true ...
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4answers
256 views

Is recomposing ideal rather than changing focus point?

As a beginner in photography I’ve stumbled across several videos stating that the center point is the sharpest and most accurate point as apposed to the others. I’ve seen many photographers take ...
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3answers
1k views

How to avoid the grainy background in sunset picture?

I was taking this picture of the sunset. I used auto focus, but the trees are not really that focused. Also, the red background is grainy. Any tips if I get this opportunity again? I was using a ...
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2answers
182 views

Focal length measurement and definition in DSLR cameras [duplicate]

So i am a bit confused when it comes to focal length in DSLR cameras. According to multiple sources online i found and as per NIKON "It is a calculation of an optical distance from the point where ...
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2answers
133 views

How to take a macro photo, but with the subject completely in focus [duplicate]

I love macro photography, it gives an insight in the small world around is. Unfortunately, I'm really not good at it. When I came across an artificial beehive, I took a chance to get into the bees and ...
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1answer
78 views

Are focus and resolving power optically equivalent?

Limited "resolving power" or "sharpness" is a problem one can see with many lower-quality lenses, especially with higher-resolution camera bodies. Playing with my cheap 500mm mirror lens, I often get ...
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1answer
457 views

Do 49 focus points mean the camera will focus on 49 different areas at the same time?

I've read a lot but could not find a clear explanation. As I understand, a lens can only focus physically on one point since the focus depends on the physical position of the lens vis-a-vis the sensor....
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1answer
984 views

70-300 AF-S Lens Won't Autofocus on one of my D7100's

I recently purchased a used Nikkor 70-300 AF-S VR lens used from B&H that is in "Excellent" condition. I have 2 Nikon D7100 bodies that I shoot with and both autofocus just fine with all of my ...
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2answers
817 views

Tamron lens focusing problems?

I own a Tamron 18-270mm F/3,5-6,3 Di II VC PZD lens - a fabulous lens, but since I got it (around Christmas time), the autofocus has been playing up; see below image. EXIF is as follows: 270mm, ...
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271 views

After I dropped my lens, focus locks but images are blurry — what could be wrong?

I have a Tamron 24-70 2.8 on a D610. I usually go for small apertures (F11 to 16) since I work with flashes on studio setups, my lens gives sharp images on those appertures but anything below F5.6 ...
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3answers
404 views

Why can't my compact digital camera focus when applying 8x zoom?

I have a compact digital camera which is Canon IXUS 165. The specification is in this link. I bought it in June 2016. It has 8x Optical Zoom. Just now I was zooming 8x on something, and when I tried ...
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3answers
5k views

How can a smartphone take pictures of a landscape with everything in focus?

After the announcement of the new Samsung Galaxy S9 with the new camera that changes aperture, I caught myself wondering: if smartphones have such a wide aperture (f/2.8, f/2.2, etc), how are ...
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2answers
120 views

Sharp focus photography with APS-C [closed]

So, it happens that I am really passionate about the sharp focus photography, where some points on the picture looks sharper than the usual, just like the example I've attached. My question is: how ...
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4answers
2k views

Why does wider aperture make snowflakes look bigger?

Recently I went out to shoot when it was snowing. I was playing around with different aperture sizes and exposure times. What I have noticed that the wider the aperture, the more snow I can capture ...
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1answer
309 views

Focus distance and infinity

When I play with M12 lenses (board lenses. Fixed fl. Aperture) , I can focus them to a distance and they have a certain depth of field. Objects within the Delta of field looks sharp. Can these lenses ...
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1answer
54 views

Pentax lens focus ring snapping

I have a Pentax DA 35mm lens that was stored in the camera bag for a while. When trying to use it today, I noticed that the focus ring motion is not smooth. It is "snapping" at specific intervals, 3 ...
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3answers
186 views

Why can I get sharp single person photos but not group photos?

I am just starting out in photography and when I am focusing on one point (like a single person portrait), I can get really sharp photos. However when I am photographing a scene or a group of people, ...
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2answers
123 views

How to tell which image from a set is the most in focus? [duplicate]

I am calibrating the focus on my 35mm film scanner, to do this I am rescanning the same photo repeatedly with different focus configurations and comparing the results to choose the configuration which ...
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1answer
220 views

Can I keep the 'Constant Preview' feature active during MF assist on my Panasonic Lumix?

I have a Lumix G7, here's the issue I'm in Manual mode, and I have Constant Preview on, so if I modify the aperture, shutter speed, ISO, WB, I see everything correctly in the preview. However, if I ...
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1answer
114 views

Does diopter settings change when lens is put on backwards?

One way of doing macro photography on the cheap is to flip the lens backwards I am having issues focusing, the diopter is calibrated but when I flip the lens the focus of taken picture is not the ...
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3answers
977 views

Camera Slow To Respond When Trying To Take A Photo | Nikon D5300

I have a Nikon D5300. When I try to take a photo (I reset all settings to factory settings) and hold down the button to focus or just a quick snap, there is a long delay in the camera finishing to ...
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3answers
170 views

help with moon flares

I recently switched from a cropped sensor, APS-C Sony to a full frame sensor Sony. When I would take pictures of the moon with the cropped sensor, I would get this: 15s, f1.4, ISO 1000. And this is ...
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3answers
874 views

Understanding focus distance of Nikon f/1.8D lens with D5600 Camera

I took some sample photos using my Nikon D5600 camera with Nikon f/1.8D lens. I had to set the focus manually since this lens doesn't provide AF with my camera. My Question: The album of my sample ...
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4answers
2k views

How can I focus on only part of the scene when there are multiple objects at the same distance?

I just wanted to have the red leaf focus only, and not have the nearby twigs in focus too. How can I achieve that? I locked the focus on the read leaf then move the camera to reposition the scene. ...
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2answers
92 views

Does processor affect auto-focus precision?

I am considering purchasing a Canon sl2. I notice that it has the same 9 point 1 cross type auto focus system that has been used for many many years. My current Canon t3 uses this auto-focus system. ...
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1answer
320 views

How do I force my Canon dSLR (800D) to take a photo?

I noticed when I went out early in the morning to take some landscape photography that sometimes when the image was "dark", the camera would not attempt to take the photo. I tried changing from a ...
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2answers
118 views

How can I cause red eye in photos I take with my iPhone 6s?

How do I cause red-eye in my photos? I had no trouble causing red-eye in my old iPhone 4; but having issues with the 6s, even with [right & left] circular polarising filters over the flash and ...
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4answers
520 views

Do convex lenses make light from different points converge to different points?

I'm starting to study camera and lenses. Most of the sources online introduce you to the concept of convex lenses, with pictures similiar to this: This picture just show you that parallel rays (of ...
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3answers
2k views

Do convex lenses make parallel light rays of different wavelength converge to different points?

I'm starting to study cameras and lenses. By reading explanations and watching videos on convex lenses, I learnt that they make parallel light rays converge to a single point called the focal point. ...