Alley in Pisa, Italy

by Lars Kotthoff

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

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13
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7answers
997 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
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 ...
6
votes
2answers
180 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
814 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
208 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
253 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
427 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 ...