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Autofocus is the ability of a camera/lens system to automatically adjust the focus of the lens via a motor attached to the focus group of the lens. Contrast with manual focus.

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352 views

Why does the Fujifilm X-Pro 1 have fewer AF points in optical viewfinder mode?

From the Fujifilm X-Pro 1 manual: When AREA is selected for AF MODE in the shooting menu and S is selected for focus mode, the electronic viewfinder and LCD monitor offer a choice of 49 focus ...
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1k views

'Bokeh' effect with autofocus switched off in manual mode (Nikon-D90)

I want to understand how focusing works in Manual mode in my D90. I switched off the autofocus buttons in the Kit lens and the camera body. I have changed to the manual mode. Now, when I try to ...
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1answer
8k views

Sony 18-250 or new Tamron 18-270 lens? Which has better autofocus?

I want to buy either Sony 18-250 F3.5-6.3 or the new Tamron 18-270 F3.5-6.3 as a travel lens for Sony A55. I have found good reviews that told me quite something about image quality of these lens. ...
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2answers
513 views

Nikon D60: Autofocus of two AF-S lenses not working anymore after using another lens

I have used my Nikon D60 for about 6 years now, with AF-S DX NIKKOR 18-55mm f/3.5-5.6G, and AF-S 55-200mm Nikkor f/4-5.6G lens, and the autofocus has been working fine this entire time. However, I ...
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61 views

Manual and Autofocus not working on near field with Canon Rebel T3

I dropped my camera on a tile floor the other day and everything appeared fine. My wife tried to take some close up pictures of a gift today and found that the Auto Focus wouldn't work on close field ...
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31 views

Focus Effect for Canon Powershot SX520 [duplicate]

How can I achieve a focus effect for Canon Powershot SX520? Something like this: Thanks!
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2answers
1k views

Lens for my Nikon D3200 dSLR is giving too much blur [closed]

I have a lens I purchased from an older film Nikon. Fits great on my Nikon D3200 but I cannot seem to figure out how to make the picture less blurry.... I have changed aperture, I have adjusted ...
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2answers
497 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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90 views

What would cause an AF confirmation light to go on and off as I approach correct focus?

I'm using two cameras: Canon EOS 400D (Digital Rebel XTi) and Canon EOS 450D (EOS Rebel XSi). 450D was more heavily used than 400D. Not so long ago I noticed that 450D's autofocus system works not ...
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2answers
240 views

Learning from one's blurred photos: where was the focus point set?

After some shooting, I inevitably find that some photos (and by Murphy, often the best ones) have a blurred subject. Even if the shots are spontaneous and hence the subject is hardly static, I ...
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2answers
219 views

Quiet video autofocus on a consumer level SLR? [closed]

I bought a Canon Rebel T3 a while back before doing my homework on the features. The video quality looks very good to me. However, I have to hold down the shutter button to keep focus. The auto-focus ...
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333 views

Why can I not disable full-range auto-focus in newer point-and-shoot cameras? [closed]

I owned a number of Canon PowerShot cameras (SD300 and SD1000), and I was always pleased with being able to quickly take one out of the pocket, and take a picture within about 2 seconds of noticing ...
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0answers
151 views

What benefits are there from autofocusing with the lens rather than with the body? [duplicate]

Possible Duplicate: How do camera body motors compare to in-lens motors for focusing? I have read in this question that the lens motor will be the one doing the focusing if both the body ...
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3answers
2k views

How can I get better focus results with my Nikon D90 at a fashion show?

I shot at a fashion show last week, and had focus problems. I used my Nikon D90 with a Sigma 70-200mm f/2.8, with no flash. I tried many autofocus settings but none of them worked. I also tried ...
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4answers
3k views

Which DSLR other than Sony A55 has best video capabilities with autofocus?

I've bought an Sony A55 camera for home use. Recording video is very important for me. Fortunately this camera is very good in video recording. It records 1080 HD and more important than that it does ...
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3answers
165 views

How do you take pictures in a dark room?

I wanted to practice photography with flash so turned off the room lights and tried to take a photo but there is a circle that shows in viewfinder when the camera has locked the focus on something, ...
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3answers
516 views

Why are my photos taken with the Sigma 18-50mm f/2.8 coming out blurred?

I'm new to photography, and I don't know why the pictures I'm taking are coming out blurred. Here's a sample image, taken with the Sigma 18-50mm f/2.8 on my Nikon D5200 at 18mm, 1/60s, f/2.8 and ISO ...
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3answers
120 views

How should I handle auto focus on a moving train

I have a Nikon D3100 with Nikor 55-300mm lens. I do railway photography and especially when light is less than optimal, the camera's auto focus has hard time latching onto an oncoming train. (I take ...
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2answers
263 views

Does this test chart show that my kit lens front focused?

I just bought me a Nikon D7100 with 18-140 kit lens. When I used focus test chart page 18 to test my camera and lens I got one of following result at 35mm/f4.2. I used Nikon's ViewNX2 to open the raw ...
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3answers
429 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 ...
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3answers
155 views

I've dropped my 6d from about 4 feet up. how do I verify I didn't mess up something?

I was sitting at a wedding and talking to a friend animatedly. The camera flew out of my hand and landed lens first and then fell on it's body. My concern is that I messed up the AF or the IS. How ...
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2answers
103 views

Are extra auto focus points expensive for the manufacturer?

Having a lot of auto focus points is a feature associated with expensive camera bodies. There are of course different types of points like crosstypes and also different sensitivities, but lets ...
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2answers
961 views

Auto-focusing problem on a Canon 500D with a EF-S 18-55mm 1:3.5-5.6 IS(standard kit lens)

I'm having problems with the lens. I've tried auto-focusing with my other lenses, and it works fine. It can only auto-focus one way, i.e. the focusing ring is still able to move, but only able to turn ...
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3answers
479 views

Why would my Tamron lens auto focus stop working?

I purchased a Tamron 70-300 mm lens for my Nikon d5300 a few days back. Its autofocus worked perfectly. But now it doesn't work at all. I am a beginner and I don't know much about it. Why would it ...
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1answer
839 views

What is the difference between touch focus and autofocus?

I have a cheap Chinese Android phone, a Landvo l200 based on MTK68XX chip. It claims to have a 13MP touch & autofocus camera. I wanted to know how this autofocus feature differs from touch focus ...
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1answer
963 views

Why does the camera say Subject is too Dark and refuse to click the shutter

I was trying to take some nice pictures of the Toronto city skyline from the shores of Lake Ontario under a full moon night. Now I put my nikon d5200 on a tripod and set f/4 and shutter = 30 sec. I am ...
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2answers
5k views

Does a Canon STM lens autofocus more quickly and accurately on a high-end camera body?

There are incredible reviews on the new Canon STM lenses: https://www.youtube.com/watch?v=ho0hOhRSuHk Does autofocus perform better on a 7D body, compared to an entry-level 700D body, for example? ...
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2answers
209 views

Should I always use point-autofocus and spot metering while shooting a small restless bird in a bush?

I am a beginner and I am finding more and more images to be out of focus or grainy when viewed on a computer screen, compared to the camera LCD. Could anyone give a step by step listing of the ...
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1answer
94 views

AF-S vs STM focus noise and speed

I have an 18-55 IS STM and it focuses instantly almost and without even a single noise. Should I be concerned if a nikon 24-70 f2.8 (brand new) makes noise when focusing? Also, in bad light (night, ...
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253 views

Is the “One shot” mode more accurate than “AI servo” using back-button focus?

By using back-button focus you don't have to switch from "AI servo" when photographing stationary subjects. I tend to do this anyway since I have the feeling it's more accurate even when I can ...
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1answer
81 views

Can the Sigma 2x teleconverter be hacked so it will work with the Sigma 50-500mm?

Does the autofocus hack (where you mask off connectors on the teleconverter to make it misreport the aperture) work on sigma 2x teleconverter fitted on Sigma 50-500mm DG lens for Canon cameras?
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1answer
120 views

Do mobile cameras ever vary f stops?

I've been trying to get my head around the camera in my newly-bought Chinese mobile phone. I wonder how focusing actually works in these kind of phones. I imagine that in the standard context of ...
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1answer
676 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 ...
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1answer
786 views

Has D600 AF fine tune option? Can I fix backfocus of my lens on D600?

I know that the D800 has an option to tune AF. Does the D600 have this option, and does it work as well as it works on the D800? Can I fix a back-focus issue with my lens on a D600 without sending it ...
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2answers
61 views

Superzoom unable to autofocus at infinity at mid-zoom focal lengths

I have an inexpensive "superzoom" camera that functions properly and fills my needs but has one problem I seem unable to resolve. It is a GE Power PRO X500 camera with which I have taken several ...
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2answers
227 views

How to set AF in night [duplicate]

Possible Duplicate: How does one focus for landscape photos in very dark conditions? Recently I went on a night forest safari trip with my Canon 1100D. I had put the camera in manual mode ...
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1answer
4k views

How to fix inoperative autofocus in Canon 70-200 F4 L USM?

This lens has been sitting on the shelf for years and I recently hauled out my DSLR to play with it. Turns out the autofocus no longer works. I'm wondering if there's any kind of remedy for this short ...
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4answers
73 views

Autofocus not working outside scene modes

I've just got my first DSLR (an old Canon 1000D) and I'm having problems with autofocus: When I'm in full auto or any scene mode (sport, portrait...) it works fine and I can make photos normally, but ...
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2answers
54 views

What technique can I use to focus on walking subject when in motion?

I have seen some photographers take photos while they are walking in a hallway or on street, etc.. where the setup is the person is walking towards the photographer, the photographer is backing ...
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2answers
83 views

Can I make my Canon 70D focus continously when viewing through the viewfinder?

I'm a newbie in photography, so don't judge me too much, just got the canon 70d and I noticed that when viewing through view finder while in P mode the camera would not focus automatically (I would ...
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1answer
76 views

Canon EOS T2i 35-55 mm lens. Won't autofocus

Actually it WILL autofocus if I force adjust focus by hand beyond subject. It then adjusts itself to focus. If the lens is focused in front of the subject, it will not autofocus. Bad servo in the ...
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1answer
123 views

How do prime lens allow variance of focal length when focusing? [duplicate]

If the definition of prime lens says that their focal length is fixed, then how come you can still alter the focal length when focusing? (either MF or AF)
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1answer
117 views

Is the Canon 7D compatible with all EF and EF-S lenses? [duplicate]

Are all the lenses compatible with 7d? Especially EF-S? Anyone having a autofocus issue with 55-250mm IS lens?
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1answer
111 views

Lumia 1020 Auto settings information?

What is the value of auto in lumia 1020 compact phone. I mean the value of iso, we can manually vary from 100 to 4000. and shutter speed from 1/16000 to 4s. brightness value -3 to +3. Every control ...
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1answer
132 views

Advice on Canon 7D Autofocus problems?

So I've had a Canon 7D for about 3 years. It's started to develop what seems like a lot of trouble with the autofocus over the last couple months. I don't recall having any such issues in the past, ...
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2answers
586 views

Which image processing algorithm does the contrast auto focus use to check the sharpens?

My read is that the contrast auto focus is using edge detection algorithms like laplace or sobel.
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1answer
269 views

Wireless Shutter Release Remote does autofocus before taking the snap?

I have Nikon D3000 and a wireless remote for it. I'm not sure about this thing: Suppose, I am keeping the camera on tripod where some birds will come. Then, I am setting my required zoom and other ...
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1answer
423 views

What to do when autofocus on Canon 85mm f/1.8 not working?

My Canon 85mm's AF isn't working. But here's the thing, it recognizes there's a lens mounted, it gives focus confirmation, and I can even set the aperture, but it does NOT recognize that it's an AF ...
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2answers
1k 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 ...
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1answer
133 views

Canon camera DIY repair

I have a digital rebel XT, an 18-55mm, and 75-300mm lens, all by Canon. Everything has saltwater damage. I'm aware that it's cheaper to just replace it all, but I was fiddling around with it, testing ...