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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Skin tones become yellower/ oranger when flash is on
When I take pictures of people, the yellow and red tones seem to be enhanced and the result is a more jaundiced complexion in best case scenario and orange and a bit shiny if their skin is a bit oily. ...
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802 views
Autofocus Not Working on 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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Why does my Nikon D3100 no longer auto-focus via the viewfinder?
My Nikon D3100 out of the blue cannot focus correctly.
It seem the that the focus motor always stops at the end of the run (Infinity) and cannot lock on the target, thus cannot release the shutter. I ...
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2answers
248 views
How to verify that Nikon SB-28DX AF-assist is working?
I have a Nikon SB-28DX which I am using with an F5. I understand from the instructions how to turn the AF-assist illuminator off. But, how do I verify that it's working? Does it still work with ...
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238 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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507 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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73 views
Circular Polarization and Passive autofocus [duplicate]
Couple of weeks ago, I was assigned a homework in one of my Applied Physics master's course. My professor asked to explain why passive autofocus works only with circular polarizers.
I am not a very ...
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43 views
Nikkor AF-S 28-70mm 1:2.8 D autofocus problem
I had this lens for quite a few years now, it used to work as expected. I didn't use my stuff for a few months, maybe 6-8 months. I just bought a D600 and tried to use them. The AF does not work as it ...
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170 views
How can I repair a kit lens with a stuck auto/manual focus mode switch?
Recently got a Nikon D5100. After a few days I realized that I can't focus in manual mode. The auto-manual (A-M) switch on the lens seems to be the issue (I have to press the switch hard to manually ...
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149 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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148 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
1k 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
2k 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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2answers
328 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
139 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
435 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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Nikon d5100 won't autofocus at all
A good friend of mine has a d5100, which was working perfectly fine yesterday. Today, however, it refuses to autofocus at all - it makes no effort to move the focusing ring etc.
I have tried ...
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1answer
263 views
Is there a way to make auto-focus more smooth while filming with Sony A55?
Wondering if anyone can help with this. I have a Sony SLT-A55, and when in video recording mode it is able to auto focus.
My issue is that it does this "too quickly".
For example, if I'm shooting ...
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1answer
6k 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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65 views
Nikon D3100 won't autofocus [duplicate]
I have a Nikon D3100, and I found out recently that when I half-press the shutter to focus, it wont autofocus anymore. I've tried it with another lens - still the same problem. The autofocus is ...
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1answer
58 views
Will a shutter half-press perform an autofocus while shooting video on an EOS 650D?
Have Canon kept this feature or has it gone like the movie cropping mode?
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Budget Nikon setup - future problems due to AF-S vs AF? [duplicate]
Possible Duplicate:
Is the lack of AF Motor on the Nikon D5100 an important factor?
I am just starting up as an amateur photographer to venture into DSLRs. Being on a tight budget, I am ...
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0answers
345 views
Need help focusing at night with DSLR [duplicate]
Possible Duplicate:
How to focus in complete darkness
I have a Canon 20D, when I shoot outdoors at night I have a very hard time getting images in focus. I primarily shoot landscapes, so ...
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2answers
609 views
Automatic autofocus on 600D/Rebel T3i during video mode [closed]
I was testing the video mode with my 600D, and I noticed autofocus was not working. I then enabled it via the menu and now you can focus when pressing the main button. I was wondering whether this is ...
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1answer
190 views
Does Canon T4i's phase-detection auto-focus system really out perform the common contrast-detection systems (e.g D5200)? [closed]
I believed that T4i's phase detection is really a winner for taking videos with auto-focus, until I read this post.
Has anyone else experienced any practical difference in the quality of videos, ...
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2answers
100 views
Understanding Auto focus capability with examples
There are lot of explanations/comparisons of auto focus capability of different cameras available.
Canon 5D Mark III has been termed as a superior camera for this feature in the semi-pro range. In ...
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3answers
3k views
Are Nikon lens double the cost of Canon auto-focus lens?
Are Nikon lenses double the cost of canon Camera? Point in case, below.
I am an amateur photographer and my usual requirements are:
Portraits with nice Bokeh
Macro (flowers, insects etc.)
Day ...
