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1
vote
2answers
120 views

How to focus manually with a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens?

I have a Nikon D3100, for which I just bought a Nikkor AF-S DX VR 50-200mm f/4-5.6G zoom lens. This is a CPU lens and works very nicely in auto-mode, i.e. when you let the camera set the focus. ...
0
votes
2answers
440 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? ...
0
votes
0answers
29 views

Nikon Lens Won't Autofocus [duplicate]

My Nikon Lens will manually focus but not auto focus. I have tried another lens on my camera body without issues and I have put this lens on another body and it will not auto focus there either. I ...
2
votes
2answers
289 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 ...
0
votes
1answer
276 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 ...
0
votes
0answers
33 views

Help is needed in Fixing Canon lenses USM's focus motor [duplicate]

I have the Canon EF lens, but the USM motor looks dead. I need help in order to get it fixed so I can use this lens again. Unfortunately a "focus by wire" system is used in this lens and I have no ...
0
votes
1answer
143 views

Why doesn't my Sigma lens autofocus if the subject is initially way out-of-focus?

I have a Sigma 150mm F2.8 EX DG OS HSM APO Macro lens mounted on my Canon 6D. Even if AF mode is set to minimum-to-infinity range, if my subject is way out of focus (too far or too near), like, say, ...
17
votes
3answers
950 views

Why don't cameras have autofocus points in the edges and corners?

On all the DSLRs I've used, there are never any autofocus points near the edges and corners. Why is that?
1
vote
1answer
194 views

What can I do about Pentax superzoom 18-270 autofocus problems?

I use a Pentax K200 and have been satisfied with the original Pentax 18-250 superzoom, for travelling, outdoors, family types of use. However the autofocus gradually failed, the motor going to and fro ...
2
votes
1answer
151 views

A recently acquired lens will focus automatically, but won't manually, why?

I have recently acquired a Sigma 70-200mm f/2.8 (Canon mount, relatively old), and it focuses perfectly in auto mode, but in manual mode the focus ring simply won't budge at all. What could be causing ...
0
votes
1answer
323 views

Nikon AF-S Nikkor 70-300mm 1:4.5-5.6 G ED Lens will not autofocus

I have a Nikon AF-S Nikkor 70-300mm 1:4.5-5.6 G ED Lens that I purchased in Feb of 2013. I have been using this lens with my Nikon D3200. Up until this point my lens and camera have been completely ...
3
votes
3answers
821 views

Is focus hunting “normal behavior” for the Sony SEL18200SE?

I recently bought an NEX-6, the 24mm F1.8 (SEL24F18Z) lens, and the black 18-200mm F3.5-6.3 (SEL18200LE) lens. I love the 24mm lens, but I'm having a what I believe one would call a "focus hunting" ...
3
votes
3answers
356 views

What can I do when autofocus suddenly starts blocking at around 2m on a Nikkor AF-S 28-70mm 1:2.8 D?

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 ...
4
votes
4answers
4k views

Missing focus with Canon 50mm 1.8 lens - is it the lens or me?

I purchased a Canon EOS 650D and EF 50mm f/1.8 II lens. Unfortunately, the auto-focus seems to miss focus at f/1.8. I've tried setting it to single-point auto-focus: it is better, but still not good ...
2
votes
5answers
4k 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 ...
1
vote
2answers
613 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 ...
3
votes
2answers
2k 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 ...
3
votes
2answers
2k views

Can a drop of a camera+lens cause AF calibration issues on either — or both — the lens and the body? What are the mechanics involved here?

My question is, if you drop a camera, and you think you might have an AF issue, what are the mechanics involved that might cause a mis-calibration? I can imagine that the lens has movable parts -- ...
3
votes
1answer
240 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 ...
4
votes
2answers
4k views

EOS Rebel T3i 18-55mm lens won't take a picture - happened with two lenses

I'm a reporter for a small town paper - Early in 2012 we had a body of a T3i go bad and it was replaced new body and we used the old 18-55mm lens. It worked fine for 7-8 months. I do a lot of sports ...
5
votes
2answers
104 views

Does “the same” lens, with different autofocus systems, have the same optical quality?

I'll give examples with Nikon only, but the question is pretty general. So, is this a fact or not? Examples: Nikkor 50/1.8G AF-S, Nikkor 50/1.8 AF-D and Nikkor 50/1.8 AF 70-300 AF and 70-300 AF-S ...
4
votes
3answers
857 views

Why are there no autofocus tilt-shift lenses? or, why do tilt-shift movements appear to be incompatible with phase-detection autofocus?

I have never seen or heard of an autofocus tilt-shift (perspective control) lens. It seems like perspective control movements prevent phase-detection autofocus from working correctly; for example ...
1
vote
1answer
329 views

Which of the following lenses do fit on a Nikon D 3100

I've been given the following lenses from my neighbour; which ones will fit a Nikon D3100? Sigma 28-200 mm F F3,8 - 5,6 Nikon Af 70-210mm F/4,0-5,6 Nikon Af 28-85mm F/3,5-4.5 Nikon 50 mm F 1.4 Nikon ...
2
votes
2answers
442 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 ...
6
votes
3answers
708 views

Have I broken my Canon 28-135mm lens after DIY repair?

Last week I removed the front element from my Canon 28 - 135mm lens to remove a grain of sand from the lens. It was easy to remove the 4 screws, take of the top layer of glass and remove the grain. I ...
3
votes
2answers
709 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 ...
3
votes
2answers
199 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 ...
0
votes
0answers
43 views

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 ...
-4
votes
3answers
4k 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 ...
0
votes
1answer
2k 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 ...
2
votes
4answers
15k 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 ...
3
votes
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 ...
2
votes
2answers
347 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 ...
2
votes
1answer
355 views

Is Sigma 50-500mm EX DG HSM lens compatible with a Nikon D90 body?

Aloha, Can anyone tell me if the Sigma 50-500mm EX DG HSM lens (non OS model) is compatible with a Nikon D90 body? I recently purchased this lens on eBay but it seems that the lens will not ...
3
votes
1answer
215 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 ...
3
votes
4answers
2k views

Which lenses typically don't focus properly on the Canon 60D?

I currently have the 18-200mm kit lens for my canon 60D. I am thinking of getting the 10-22mm wide angle lens as a second lens. So far with my kit lens I havent experienced any focusing problems or ...
6
votes
6answers
1k views

Is it important that the Canon 1DX isn't specified to autofocus with lenses slower than f/5.6? [closed]

Seeking the lens market AND the related info WRT Canon 1D X, I found some things which seems concerning: 1st, a note from Canon's Chuck Westerfall (see here) saying: “AF is unavailable on the ...
2
votes
4answers
312 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 ...
2
votes
1answer
2k views

How do I fix a lens with a problem returning to autofocus mode?

I bought a Canon EF 28-105mm f/3.5-4.5 II USM lens for my Canon 350D. It works mostly fine, except after switching from AF to MF, I can't return to AF mode. After I switch MF->AF, the lens doesn't ...
4
votes
2answers
1k views

AF-D vs AF-G: is the aperture ring necessary?

I just purchased a Nikon D7000 with an 18-105 f/3.5-5.6 AF-S lens. I'm also looking at purchasing a lens around the 200-300mm focal length range, and I found the 70-300mm f/4-5.6 AF lens. As far as I ...
1
vote
1answer
7k 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. ...
1
vote
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 ...
17
votes
5answers
2k views

When would one need manual focus override?

In lens reviews, ability to override auto-focus manually is often referred to as a good (and important) feature. I have rarely, if ever used that feature, so I feel I might be missing out on an ...
18
votes
4answers
9k views

How do camera body motors compare to in-lens motors for focusing?

What is the difference between using a motor on the camera body and the motor built into lenses? Aside from how both compare in terms of speed, what differences would I notice if I use a body with a ...
5
votes
2answers
995 views

Can't auto-focus at full zoom

I have a Canon 1000d, and the standard lens EF-S 18-55mm. Recently I was out taking photos and I've noticed that if I zoom in fully, the lens can't auto focus. I can still take shots using manual ...
9
votes
2answers
769 views

What is manual-priority autofocus?

I have been looking at the Nikon AF-S 35mm f1.8 lens and it has two focus settings: Manual Focus Manual-Priority Autofocus What is "manual-priority autofocus"?
12
votes
1answer
4k views

What is a focus limiter?

What is a focus limiter and how does it work? What is the advantage of it? For instance Tamron 90/2.8 Macro has a focus limiter. According to the documentation: In the limit position, the Tamron ...
5
votes
1answer
360 views

AF switch on lens vs. AF switch on camera

Is there any difference between using only the AF/MF switch on my camera (Nikon D90) or using the AF/MF switch on my lens (18-105mm)? Could having autofocus on my camera switched to manual focus ...
10
votes
3answers
1k views

What type of lens will auto-focus on Nikon bodies without a focus motor?

I know my D40 doesn't have a motor in it to auto-focus lenses. What type of lens has the motor in it? How can I know which lenses will and will not work?
10
votes
2answers
944 views

How can I determine if my Sigma 10-20mm lens copy is appropriately sharp and focusing right?

I just purchased a Sigma 10-20mm lens (Canon mount) and based on the reviews I was aware that many people receive copies of the lens that are soft or don't focus properly. I purchased from B&H, so ...