All Questions
11
questions
2
votes
1
answer
89
views
Depth of field and aperture size [duplicate]
Why does a smaller aperture size have a high depth of field? What is the physics behind this?
- 21
0
votes
4
answers
383
views
Which aperture value determines depth of field on variable aperture lenses?
Do variable aperture values represent the way in which depth of field is rendered by a lens or only to the transmission of light (i.e the brightness)?
For example, if i wish to calculate depth of ...
- 626
3
votes
6
answers
4k
views
Why do we need a DOF preview button?
Why not just show the effective depth of field, by default?
What's the point of having it display a picture that's different to how the image will actually turn out?
My first thought was, it must be ...
- 615
4
votes
3
answers
175
views
What type of lens should I buy if I want strong out-of-focus blur?
I'm looking for a lens to focus on one thing, and the background is really blurred out. I also want really good quality. I was looking a 50mm prime.
- 49
1
vote
1
answer
3k
views
Does the Canon EF-S 24mm f/2.8 STM Lens offer any significant advantage over the Canon 18-55mm IS II at a 24mm focal length?
Does the Canon EF-S 24mm f/2.8 STM Lens offer any significant advantage over the Canon 18-55mm IS II at a 24mm focal length (the kit lens for my T3i)?
I'm looking for a cheap lens that offers a wide ...
- 13
5
votes
3
answers
585
views
Is it possible to get smaller aperture with diaphragm in front of the lens?
My camera has narrowest aperture of f8. To increase depth of field, could I place an opaque "filter" or lens-cap with a small hole, e.g. 12 mm for f16, on the lens? I realize that at short f.l. the ...
- 2,636
3
votes
4
answers
837
views
How is it possible to have shallow depth of field with a small aperture? (The tele-macro paradox.)
Some longer tele lenses have a macro mode that allows for really shallow depth of field that have a lot of background melting when using relatively narrow apertures; like f/4.5-6. I have tried and ...
- 2,724
5
votes
6
answers
19k
views
In what kind of scenes does it make sense to use f/1.4 aperture?
I have been told that it is difficult to focus with an aperture of f/1.4.
So, in which kind of scenes does it actually make sense to use the f/1.4?
In portraits they say that it is important to keep ...
- 5,612
10
votes
6
answers
9k
views
Will a lens with a low aperture value give me better portrait photos?
I want to take pictures of people from 5-20 feet away. I attend lots of group events and am free to walk around and snap photos.
I just purchased a Canon t3i and it comes with a 18-55mm kit lens. The ...
- 793
7
votes
4
answers
2k
views
Is depth of field and bokeh influenced by distance to the subject?
I know that the aperture size has a direct effect on the depth of field.
However, what about distance to the subject? Let's say I took two pictures, one at 24mm and one at 70mm, using the same lens ...
- 1,827
-5
votes
5
answers
21k
views
How can I get bokeh with an aperture of 3.5 as my max?
I am trying to get DOF portraits of my daughter with my Nikon d7000, as per my previous post.
I have zoomed in to 100mm or so and tried to get a large aperture but as I zoom, the camera decreases f# ...
- 7,908
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