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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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358 views

How can a teleconverter allow manual focus lenses to autofocus?

I've found that some discontinued teleconverters, such as the Pentax F 1.7x AF Adapter and Nikon TC16A, enable autofocus with manual focus lenses. How is this possible? Does this system have any ...
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votes
1answer
377 views

What does AF -0.5 EV sensitivity mean? Or -3EV in Canon 6D's case? [duplicate]

I know that it stands for Exposure Value, so my 6D focuses in 2.5EV worse light than a 600D. But it's relative to... what? What makes it meaningful? What's the "base unit" for AF sensitivity?
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3answers
152 views

Why won't Nikon V1 autofocus with a close up filter attached?

I have a Nikon V1 with a 10-30 mm lens and recently purchased a +10 filter for close up work, but the camera won't focus when i use the filter. Am I doing anything wrong or is this a limitation of the ...
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3answers
1k views

Where is Canon 1100D autofocussing in low light low contrast conditions?

It's obviously my fault for living in the UK and expecting to want to enjoy my bird photography in grey January afternoons, but, I would appreciate some opinions on the following. I took 150 shots ...
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2answers
687 views

All my photos were blurry

I recently did a shoot of a baby and my 6 year old son, and I got some fantastic shots that were super sharp. I then did another shoot of a 6 year old and toddler and every single photo was slightly ...
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1answer
375 views

I almost cannot switch to manual focus on my Canon 17-40 f/4 L lens

Usually troubles with autofocus are related to a non working AF. I've got the opposite issue: AF is working too well. Actually, it is ALWAYS working, and I cannot turn it of. Even when I switch to ...
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2answers
4k views

Are there solutions to limitations on using back-button AF on Nikon D3100?

I have started to use my D3100 with my AE/AF-L button set to AF. So in other words I use this button instead of the half press shutter button to AF. I'm new to this technique and came across it here ...
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3answers
176 views

Do focus area modes matter if shooting in manual focus?

It seems my camera lets me change the focus area modes (e.g wide, center or spot) even when I am shooting in manual focus so I am trying to understand if area modes matter even if the camera is in ...
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2answers
2k views

What is a Dual pixel autofocus?

I have seen the term "Dual Pixel CMOS autofocus" used by Canon (specifically in relation to the 70D). What is it? Is this Canon specific technology? Are there equivalents in other manufacturer's ...
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2answers
198 views

lens care: compressing lens without full-time manual focus when camera is off?

The lens manuals for my lenses without "full-time manual focusing" warn not to use the focusing ring when it's in Auto-Focus mode. I assume that even applies when the camera is off, but am I being ...
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2answers
438 views

How To Fix Badly Functioning Shutter Release-Button?

I have a compact Pentax OptionM10 which I bought in 2006 and sometimes shutter-release button works only when pressing it on edge and under specific angle, but mostly as I apply little pressure which ...
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1answer
91 views

How to test the autofocus system before asking for support?

For outdoor usage I got an Olympus TG-2 compact camera. Various tests claimed autofocus: 'quick and mostly accurate' - at least I could not find any that described problems. Now, I know that I cannot ...
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1answer
1k views

What settings affect how the focus points are displayed for my 7D?

My Canon 7d is about 2 months old. I used it for a shoot in DC, and it just isn't behaving as expected. When I try to focus, I get little black boxes in the focus frame. They used to be black, with ...
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2answers
1k views

Is it safe to manually-focus the Nikon 18-105 while in autofocus mode?

There are only A and M settings, no A/M. but I just noticed that Nikon website has mentioned three focus modes for this lens: Auto, Manual and Manual/Auto I'm confused if this is only a typo or is it ...
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2answers
122 views

How can I be sure a lens will autofocus on my Nikon D5000? [duplicate]

Possible Duplicate: What type of lens will auto-focus on Nikon bodies without a focus motor? I have a Nikon D5000. For Nikon Lenses I know that I have to buy ones that are AF-S. Easy ...
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2answers
1k views

Is it really better to not half-press to focus with the Fujifilm X-Pro 1?

Fujifilm's new camera uses contrast-detect autofocus, and the current Internet hand-wringing is over whether this is a horrible critical flaw or not. As often happens in such discussion, a bit of ...
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3answers
2k views

Is the Canon 600D Al servo autofocus up to the task of following moving subjects?

Has anyone tried shooting fast moving subjects (birds, cars, running animals) with Canon EOS 600D using Al servo autofocus? I am thinking of getting this DSLR but the internet reviews are a bit ...
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3answers
1k views

Is focusing problems on Sigma lenses still a problem on a Canon body?

I am considering purchasing the Sigma 70-200mm f/2.8 EX DG HSM II Macro Lens. The problem is that many reviews point out that the lens has front focus problems, at least on a Canon mount. But those ...
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1answer
233 views

Why 5-50x focal length for autofocus micro-adjustment?

When we do an AutoFocus Micro Adjustment session, the general opinion is to set the focusing target at 25 x focal length (or somewhere in the range of 5-50 x focal length). Why is so? What happens if ...
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1answer
148 views

Is it normal for live view to freeze when focusing with a point & shoot camera?

I went to a Best Buy recently and tried a few point-and-shoot cameras, among which the Canon G15, Canon SX260, and Canon SX50. With all of them, I noticed that the live view freezes for a short time ...
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1answer
206 views

How can one measure the autofocus performance of a lens?

Many of the lens reviews tend to comment on their autofocus performance, but they seem to be mostly subjective in nature (fast, slow, hunts around etc). I understand that the autofocus performance is ...
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1answer
462 views

Why doesn't the focus assist light get triggered on a flash connected via a Pocket Wizard TT1?

I have a Pocket Wizard TT1 and TT5 which work fine. I mount the TT1 on the camera shoe and the TT5 fires my remote flash ETTL fine. I now want a focus assist light, so I set a flash (580, 430 or ...
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2answers
114 views

Why are phase detect lenses adapted onto contrast detect bodies so much slower?

The Sony A7 is able to adapt almost any type of auto-focus lens (Canon/Nikon/etc) and use autofocusing, but the auto-focusing is much slower than the same focal lengths native for the A7. Why would ...
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4answers
342 views

How to take a photo of defects on a mirror?

Taking a picture of a reflected image of object is depicted in this image. Camera focus is on the image of a piece of paper. Besides the depth of field (cheap Panasonic DMC-FX8 in makro mode, ...
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3answers
296 views

How to correctly focus on the background person in a shot?

I tried to take some portraits of my sister-in and her fiance earlier in a sunny, green park. I took a few pictures where the fiance is closest to me but turning to look at his wife-to-be who is ...
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2answers
333 views

How can I find which lenses have “Continuous manual focus”?

Canon lenses with USM auto focus can be called "continuous manual focus" (at least some). By this I mean that you can override the AF without switching it off. I've found this very handy, and I often ...
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5answers
3k views

Why my “action” shots are blurry even shooting on AF-C, is this a lens or camera limitation?

I'm currently using a Nikon 28-200mm AF-D with my D7000. While trying to take action shots (e.g. my dog running or sports) none of the shots seem to be in focus even on AF-C mode. Would this be a ...
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2answers
459 views

Why is AF performance different in automatic and selective mode?

How often do you use AF in selective (SEL) mode? The reason why I'm asking is that I've noticed that on a Pentax body (K10D and K-5) the AF is a lot more accurate when in AUTO mode than in SEL mode. ...
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4answers
269 views

Which one is better - more cross-type sensor or better sensitiveness of cross-type sensors?

What makes better sense for situations like: low light, sports/action, wild life? More cross-type sensor on AF (like Canon does) Or more sensitive cross-type sensors (like Nikon does)
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3answers
275 views

How to take clear photographs with DSLR

I just bought a Nikon D5200 with the 18-105mm lens and I have taken this flamingo photograph but can't see their faces properly and If I zoom in a little bit the image is pixelated. I have tried ...
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4answers
307 views

Will the Nikkor 85mm f/1.4D be a good fit with the D60, even though it doesn't autofocus?

I've been using a Nikon D60 for over a year now, and thinking about upgrading the stock lens. I am thinking about this lens: Nikon Telephoto AF Nikkor 85mm f/1.4D IF Autofocus Lens But on the page ...
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2answers
241 views

Do separate autofocus motors exist for entry level Nikon DSLRs?

I have a Nikon D3200, which doesn't have an autofocus motor. Therefore, I'm mostly deterred by lenses that don't have focus motors in them. But the ones that do have it are much more expensive. Take ...
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2answers
235 views

In which situtations are cross-type autofocus points better?

I understand that the difference between "regular" autofocus points and cross-type ones is that the latter consist of two diagonal "regular" ones. I also understand that this is better. But what are ...
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4answers
13k views

What should I do when my Nikon AF-S lens won't auto focus?

I have a Nikon 35mm f/1.8G AF-S DX I bought for my Nikon D5100, it's only a couple months old, never been dropped or anything, and it all of a sudden won't auto focus. Anyone know if this is a simple ...
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2answers
551 views

How important is auto focus and aperture control in a macro setup?

I'm thinking of starting some amateur macro photography, and I'm not sure I want to go with macro lenses, due to their price. I currently have the following lenses: Canon EF 50mm f/1.8 II Canon EF ...
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2answers
231 views

How to tell whether a lens has an autofocus motor or not?

I have to buy a lens and I have a Nikon d7000. I want to know which lenses have AF motors and which do not, as the D7000 has an AF motor built into the body. How do I tell whether a lens has a motor ...
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2answers
200 views

How AF works with lenses f/2.8 vs f/4

I read following in a web site (http://realphototips.wordpress.com/tag/ai-servo/) Lenses with maximum apertures of f2.8 allow the camera to use all high precision sensors. In low light or other ...
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2answers
286 views

Should Canon 5D mk II autofocus be accurate enough for a f/1.2 lens?

What autofocus accuracy can be expected from an EOS 5DII or EOS 5DIII camera? I have an EOS 5DII with f/1.2 and f/1.4 lenses. I have a lot of problems getting consistent autofocus with these lenses. ...
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3answers
2k views

Why is AF slow in Live View on DSLRs?

Why is AF so slow in Live View on SLRs ? On compacts, the AF works very smoothly and quickly.
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2answers
1k views

Why is my Canon 500D with kit lens having trouble focusing at higher focal lengths?

I have a Canon 500D with the kit lens. Recently I have observed that its not able to focus at higher zooms but it works at min zoom. To get it to focus, I have to zoom out or recompose and it works. ...
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2answers
1k views

Why are my pictures blurry/soft?

Ok so I shoot basically one thing....real estate. I am in the market for a new camera so I borrowed a friends canon 50d. I have been using a Rebel xti and been getting good results but I want to ...
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2answers
2k views

How to eliminate auto focus noise in video mode when using NIKON D7000?

You can hear the noise when taking a video w/ NIKON D7000 w/ normal lens. Is there any way to get rid of the noise? Will shotgun mic help? Thanks in advance!
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1answer
975 views

Why did my 50mm f/1.8 Canon lens deactivate autofocus on Canon EOS 1000D?

I recently lent my 50mm f/1.8 lens to a friend who owns a Canon EOS 1000D. Afetrwards he told me that the camera had deactivated autofocus when he switched back to his kit lens (18-55). Is this ...
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3answers
289 views

How does autofocus point selection relate to manual focus?

Every lens I have comes with an auto-focus / manual focus switch. How should it be used if I am shooting on AV mode? If I were to select one of the focus points, do I need to have the lens on ...
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2answers
4k views

Why does Nikon D3100 locks Shutter in Autofocus mode?

So I just got this Nikon D3100 Camera. And I am trying to take a picture using autofocus with the kit lens(18-55mm). The system is in Auto mode, AF-A, single frame and the lens A-M switch is on ...
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2answers
396 views

Why is my lens focusing sound lounder than before?

I'm new to DSLR camera. I didn't mount a lens properly. The camera still allowed me to take photos, so I didn't notice the error. After I had been using it for 10 minutes I noticed my error and ...
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1answer
110 views

Does using multiple batteries (via grip) improve AF speed?

I want to say I read somewhere that, particularly with heavier lenses (such as the 70-200 F/2.8), having two batteries in the portrait grip would provide extra juice to the AF motor and help it ...
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2answers
2k views

Do I use the camera or lens switch to change between auto and manual focus?

I own Nikon D7000 with 18-105mm lens. I am bit confused how the auto focus and manual focus switching works, particularly with my gear. The confusing part is both the camera and lens have an A-M ...
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1answer
699 views

Why does my D70s no longer focus my Nikkor 70-300, but still focuses the 18-70?

At first I thought my lens was dead but after switching to my other D70s it worked fine. So, here's the issue: One of my D70s bodies can no longer auto-focus my Nikkor 70-300 lens. Switch to a 18-70 ...
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1answer
505 views

How do I make the focus point indicators stay long enough to select on the Canon 60D?

I have just switched from the Canon 500D to a 60D. Most of my work is property based, and this is therefore 90% internal flash shots where I often wish to pick out a particular spot for best focus. ...