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Focus is the mechanism of converging light from a point light source onto an imaging plane by a lens.

learn more… | top users | synonyms

8
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3answers
1k views

How can I take photographs with a large depth of field?

I was looking at some pictures by TSO Photography, and I was struck by how everything in the image seems to be sharp and in focus. I do realize that to achieve huge depth of field, you set the ...
22
votes
3answers
6k views

How can a 18-55mm lens focus on objects beyond 55mm?

I guess this is a total noob question, but doesn't 18-55mm mean that it can focus only up to 55mm?
6
votes
3answers
505 views

Do still photographers use follow focus, as filmmakers do?

Is a follow focus system beneficial to photographers in low light or other situations? Almost all professional filmmakers use a similar system to manually focus lenses, but I am not aware of ...
2
votes
1answer
418 views

Why is my Canon Powershot A1100 focusing only on the bottom part of scenes?

I've been using a Canon PowerShot A1100 IS camera for the past year and it had been working just fine until I decided to change its settings. After I had serious trouble with it, I reset the settings ...
7
votes
5answers
417 views

In which situation should you not use the manual focus?

Couple of weeks back, I discovered the power of manual focus, and now for each and every shot, I use manual focus! Are there some situations where manual focus doesn't make much sense and we should ...
14
votes
1answer
9k views

What do “Frontfocus” and “Backfocus” mean?

I've read those terms in a couple of lens reviews, and not even Wikipedia has an article about it. So my questions are: What is back/frontfocus? What causes back/frontfocus? Is there any preventive ...
1
vote
1answer
249 views

Does autofocus work with the Pentax K10D and Tamron 18-250mm?

Hallo; does autofocus actually work with the Pentax K10D and Tamron 18-250mm? If so,how good/fast is it?
4
votes
4answers
229 views

Doubt about focusing in the lens?

I usually find after blowing out my pic in computer that at one point (where I wished to focus) image is very sharp, then as I inspect the picture I see that some more part of the image either ...
1
vote
2answers
882 views

Why does focusing feel less accurate to me on the Canon 600D than the 60D?

Is there a substantial (or minor) difference in the focusing in 60D and 600D. I tried both in a showroom and felt (I may be wrong) that there was a difference. The focusing I felt was very quick and ...
1
vote
1answer
245 views

Is it possible to improve focus with the Samsung Galaxy S?

Samsung Galaxy S video and photo quality is pretty good but only when fully focused. The focus is getting lost very easly and it become blurred. Are there any ways to increase focus quality and speed? ...
26
votes
6answers
4k views

Can I damage the focus system by turning the focus ring when the lens isn't mounted?

I have a couple lenses that don't have an internal focusing system, and whenever I want to put them back in my bag, I turn the focus ring to make the lens shorter. I noticed that when the lens is set ...
0
votes
2answers
4k views

Best Focus Settings and Methods for DSLR Video? [closed]

Camera Body: Canon T2i Lens: Canon EF-S 18-55mm f/3.5-5.6 IS SD Card: Transcend 16GB, Class 10 Stabilization: Handheld/tripod (maybe) Question: I'm going on vacation this weekend and would like to ...
4
votes
2answers
975 views

What is the meaning of having 9 focus points and how to see where they are?

Canon PowerShot SX210 IS is said to have 9 focus points. I haven't seen any setting which shows all those points on the screen or anywhere. How and what are those remaining 8 focus points used for? ...
5
votes
2answers
873 views

Is it possible to Zone Focus with a DSLR?

I have a Canon 1000d. Is the zone focusing technique applicable in a DSLR? If yes, how do we do it?
3
votes
3answers
3k views

How do I take forced perspective photographs with a point & shoot camera?

My teenage son needs to take some forced perspective shots this weekend as part of a camping/hiking trip. He has a Panasonic DMC-FX01 point and shoot camera. He wants to be able to hold up something ...
7
votes
2answers
3k views

How can a prime lens focus on more than one plane?

By definition, a prime lens is a fixed lens system with a fixed focal length. Then, simple physics tells us that it should be able to focus only on one plane (at a fixed distance) in front of it. But ...
17
votes
3answers
1k views

How can I get better focus when a subject is moving towards or away from the camera?

When shooting events or action photos, engaging people, I often find that frontal (or rear) perspective may be very expressive, but my problem is focusing when the subject moves towards the camera (or ...
11
votes
6answers
7k views

How can I get everything in focus?

I have a Canon 550D with 70-200 f4 and 50mm prime lenses. Although the camera has built-in 9 focal points, I sometimes face a strange problem. Here's a sample photo: In reference to the above pic, ...
4
votes
4answers
1k views

Why does my Nikon D90 autofocus not work in rapid succession?

When photographing candid shots of my children at play with a Nikon D90, I have trouble with the autofocus system. I focus and shoot one shot, great. But a second later another shot opportunity ...
25
votes
3answers
3k views

Does changing the focal length change focus?

When using manual focus or back focus on D60, I sometimes zoom in the lens, set the focus, and then zoom out. Does changing the focal length (zooming out), also change the focus? In case the answer ...
5
votes
1answer
21k views

What is the difference between Al Focus and Al Servo autofocus modes?

Recently I bought a Canon 60D and I am uncertain about when and how to use/activate the Al Focus and Al Servo functions. I understand the One Shot autofocus function for still subjects. You press ...
7
votes
1answer
2k views

How do you trap focus on DSLRs without native support for it?

I came across the term trap focus on the autofocus page of wikipedia, and it seems to be a very handy feature that triggers the shutter release when a subject moves into the focal plane. This feature ...
13
votes
7answers
1k views

How can I improve focus using both manual and auto on a candle flame?

I got my new tripod and 50mm F/1.4 sigma on my Nikon D7000 and was testing it out doing some shots of a flame on a candle. The below image is the sharpest i was able to produce. In review of my 50+ ...
1
vote
0answers
380 views

How do you focus in the dark? [duplicate]

Possible Duplicate: How to focus in complete darkness When I take a photo of landscape (or something beyond the range of the focus assistance lamp) at night, it's hard to see when the ...
27
votes
8answers
3k views

What is the advantage to back-button autofocus?

I've heard some advanced photographers talk about using back-button autofocus. As I understand it, this involves changing one of the camera's custom setting to engage the AF when a button on the rear ...
12
votes
1answer
5k 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 ...
6
votes
2answers
189 views

Fisheye Image Quality: Improves with Price?

Using a little Opteka fish attachment, I've gotten some very cool shots. The problem is that all shots get, of course, progressively less sharp as you move out from the center. I know that this is to ...
12
votes
4answers
899 views

How close can a lens focus?

From my understanding, if you want to do some macro photography it is better to have a lens that can focus when it is really close to the subject. Sometimes people buy extension tubes to help them ...
6
votes
2answers
222 views

Can a hard impact foul up a lens' focus?

Recently, a camera with lens attached got knocked off a chair and hit the floor (not my gear, fortunately!). Following that, the lens would not focus properly, either with manual focus or auto. The ...
5
votes
3answers
2k views

What's that sign with a dot and a number in the view-finder?

I have a Canon 550D and when I look through my view-finder to take photographs, it displays all the current settings inside the view-finder itself like aperture value, shutter speed, ISO etc. ...
16
votes
5answers
2k views

How to improve focus accuracy?

I've noticed that quite a few of my photos aren't terribly well-focused. This particularly happens at long focal lengths. I'm using a Canon 500D and (mostly) a Tamron 18-270mm f/3.5-6.3 lens. I find ...
15
votes
1answer
3k views

What is focus throw?

This answer to an earlier question of mine about manual focus lenses uses the term "focus throw". Exactly what does that mean? Why do manual focus lenses have more of it than auto focus lenses?
9
votes
1answer
256 views

How can I achieve an effect in still photography that's analogous to a cinematographic effect?

I don't know how it's achieved or what it's called, but occasionally in a movie I see an effect in which the perspective of the scene is modified in such a way that the objects that are further away ...
19
votes
2answers
1k views

Why am I allowed to turn my focusing ring beyond infinity?

Is there a good reason why I can turn the focusing ring on my lenses beyond infinity mark on focusing scale? Following recent questions here and here, it sounds like a real usability issue. ...
12
votes
4answers
1k views

How do you manually focus accurately without a focusing screen?

I have a Canon 1000D and it doesn't come with a focusing screen. Sometimes my camera cannot focus in low-light. I'd like to manually focus, but without a focusing screen I haven't been able to do it ...
9
votes
7answers
440 views

Focusing an entry-level DSLR

I like really really sharp photos. Even with a prime lens, I seem to be able to do noticeably better with my 450D by manually focusing using live view at maximum zoom than by using auto focus (even ...