# Questions tagged [infinity-focus]

Infinity focus is when a lens forms an image with sharp details of an object at infinite distance away.

26 questions
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### What does focusing past infinity look like?

Would it nearly instantly become unfocused, or would it be more or less gradual?
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### Why does some lenses have red focus points on their focus rings? [duplicate]

A typical lens have white focus indicators on their lenses [5m 50m and infinity] but some have red points for 85m and farther and some lenses have a red curve instead of numbers. What are these red ...
139 views

### How to test image quality with a camera that is focused to infinity?

I have to test a camera that is focused to infinity, but I cannot take an image of an object that is more then 1.5 meters away from the camera because I can't get it out of the room itself. (The room ...
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### Background Focusing

Besides setting the lense to Manual focus, can single point Auto focus be used to focus 'beyond' a foreground of tree branches to infinity? Living in the mountains makes long distance focusing a ...
308 views

### Hyper focal distance versus maximum focus distance before infinity

I have a Sigma 18-35 1.8 sigma lens. The latest number on the distance scale of this lens is 2m. At subjects further than 4.22m the lens focusses at the infinity mark. The exif data confirms this, as ...
2k views

### What is the formula for determining where infinity focus begins?

I'm having difficulty find any info on determining where infinity focus begins. I'm assuming there's a formula involving focal length and... Can anyone help?
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### How can I get infinity focus, both including the moon and a tree in the foreground?

I'm trying to take photos of the moon with other objects in the foreground but I can't seem to get both in focus. How far do I have to be from the tree to have pan focus (foreground and background in ...
567 views

### Why are my pictures blurry even though a DOF calculator shows everything should be in focus?

In theory, according to the DOF calculator, I can achieve infinity focus with my Sigma 10-20 at f/3.5 when focusing at a subject that's 2m away but when I put it to the test my pictures come out super ...
501 views

### Why does my Zorki 4 take blurred pics on infinity focus?

I've recently bought a Zorki 4 and the results I get from my test roll are quite disappointing. I've been calibrating the mirror, adjusting it for both infinity focus and close one (1 meter). Here is ...
135 views

### What is the point of the Olympus E-620 infinity reset

In the manual, it states: RESET LENS When set to [ON], this resets the focus of the lens (infinity) each time the power is turned off. What does this mean? Does this mean that if I were to turn ...
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### Why are my long exposure sky shots out of focus? [duplicate]

If you take a look at a few of long exposure sky photos at Flickr, I think the context and content of the photo is okay, they are just all blurry. I'm using a tripod, 15 second exposure with a 18mm ...
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### Does focusing at infinity mean the sensor is at F?

According to thin lens optics, an object focused at infinity should correspond to the sensor position exactly at F, which is the focal length of the lens. It also means that the image of every point ...
149 views

### Lens Focus Issues

I have been having focus issues with a Canon EF 24-70mm f/4L IS USM lens. It seems that it is unable to focus at infinity (or close to it)for most of the range between the wide and telephoto ends ...
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### 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.
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### 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 ...
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### What influence does aperture have on infinity focus?

I recently bought a fast aperture lens which can be used only in manual mode. I bought this lens specifically for low light landscape photography. However, that has got me thinking about how does ...
1k views

### Infinity focus problem

When I shoot with my camera with many lenses at relatively wide apertures, and try to focus to infinity, (manually, using zoomed live view or otherwise), I find that end result pictures are not ...
700 views

### How do I focus at a specific distance (in meters)?

When I use the manual focus mode, I usually adjust it until the object I care about comes into focus. But sometimes the object is not there yet, so I'd like to know if there is a way for me to tell ...
3k views

### Can I modify a Logitech C615 webcam for infinity focus?

I've been using the Logitech C615 web cam for some time now, for timelapse photography. However I'm not perfectly happy with its focus at "infinity". It's not perfectly clear. On closer distances the ...
2k views

### How much does a drop in temperature affect focus?

In an answer to question "What lens characteristics are important in astrophotography?" there was mentioned "If the temperature changes drastically, you may need to refocus as different materials in ...
5k views

### Why do some lenses focus past infinity? [duplicate]

On the kit 18-55 lens that came with my Nikon D5100 I have noticed that when trying to focus on infinity for shots in dark conditions (star-trails, etc) the lens tends to move past infinity out of ...
29k views

### What does infinity focus mean and when should I use it?

All my lens have focus ring where at the end there's an infinity symbol. What does that mean? If I'm taking landscape shot and what everything from near to far to be in focus, do I use infinity? Or am ...
6k views

### How to calculate the size of the image circle at infinity focus?

How can I determine the diameter of the image circle (i.e. the diagonal size of CCD required to fully utilise a telescope's optics) at near-infinity focus? I have looked around online and found this ...
461 views

### Nikon P310 - Infinity Focus and Flash

I have a Nikon P310 point and shoot which I intend to use for a very specific application. I want to use infinity focus setting. However, when selecting infinity focus the camera disables the flash. ...