Napioa - Wind Origins

Napioa - Wind Origins
by octopus                

Submit your Photo
Hall of Fame

Please participate in Meta
and help us grow.

Aperture is the opening in the diaphragm of a camera lens. For questions relating to Apple's photo management software, please use [apple-aperture] instead.

learn more… | top users | synonyms

6
votes
2answers
2k views

What is the relation between shutter speed and exposure compensation in aperture priority?

I was using a manual focus lens with canon 600D and notice something in aperture priority mode. When I was applying the exposure compensation of -2EV, I had a shutter speed of 1/20 sec and when the ...
6
votes
2answers
623 views

What is the effective aperture of two stacked lenses for macro?

Is there a way to calculate the aperture of two lenses stacked together for macro? In my specific case, I have 90mm f/2.8 and 18mm 1/3.5 lenses.
6
votes
3answers
789 views

Does Av mode on my Canon DSLR take IS into account when deciding shutter speed and ISO?

Most of the time when I'm out I'm shooting, my camera is in Av mode. I've selected the aperture size I want and I'm letting the camera decide on the correct shutter speed and ISO that are required to ...
5
votes
2answers
1k views

What is a good rule of thumb to use large aperture for portraits vs showing more background?

I recently got a Canon 50mm and have found myself probably over-using the large apertures for portraits. I'm curious if anyone has a good rule of thumb for when to avoid it. My sense is that its ...
5
votes
5answers
1k views

How can I shoot in a studio at the widest apertures?

I ran into a limitation while shooting a newborn baby this weekend. I was indoors next to a set of windows. I was also using an off camera flash on a stand through an umbrella. The flash was a Canon ...
5
votes
4answers
2k views

What are the types of aperture blades?

The Canon EF 24-105mm f/4 L USM IS lens has rounded aperture blades. What other types of aperture blades are there, and what are the advantages and disadvantages of each of them? Is the aperture ...
5
votes
1answer
333 views

What's the history of neutral density filters instead of aperture diaphragms in compact cameras?

Some compact cameras use neutral density filters to control light rather than aperture blades, to avoid the effects of diffraction in tiny sizes. I first heard of this as a feature of the Nokia N8 ...
4
votes
2answers
221 views

What is the maximum aperture consistent with the Nikon F-mount?

In a related thread, it's been debated whether there is a hard limitation to maximum possible lens aperture; it seems there is none. However, using the example of the nikon F mount, this technical ...
4
votes
3answers
447 views

Is the aperture wider at 200mm f/5.6 than at 18mm f/3.5?

Speaking of the physical aperture. When looking at the 18-200 mm, f/3.5-5.6, I wonder how this works. With diameter D = f/N I get: 18 mm / 3.5 = 5 mm 200 mm / 5.6 = 35 mm So, does the aperture ...
3
votes
2answers
301 views

How to compare the speed of lenses taking transmission into account?

When comparing the speed of two lenses, you almost exclusively hear about the maximum aperture. This of course makes sense, since at a certain lighting condition, a larger aperture in general allows a ...
3
votes
1answer
232 views

Lens f-number and speed on adapted lenses

A lens has a focal length, and its entrance pupil has a diameter. The ratio of these is an f-number. The size of the entrance pupil is limited by the size of the front element, and we describe lenses ...
3
votes
2answers
262 views

Is there a difference in sharpness between aperture stops?

Is there a notable difference in sharpness between aperture stops of a lens? If so, where can I find that information for my Canon 550d Kit lenses?
2
votes
3answers
6k views

Can I use a large aperture of f/2.8 while shooting landscape photography?

Can I take a picture of a wide area such as a big house at 10m, in low light, using a large aperture of say f/2.8, at a focal length of 50mm? I will have no subject between my camera and the house.
1
vote
1answer
130 views

Why don't all zoom lenses have variable f-numbers? [duplicate]

As I understand it, the f-number is a ratio between the focal length and the aperture diameter. A zoom lens can change focal length, but shouldn't the maximum aperture be a fixed size? If so, that ...
1
vote
7answers
2k views

Do I use the crop factor in calculating aperture size and area?

How do I calculate the aperture size and area, considering an 35mm equivalent focal length value and non-equivalent aperture f-number (in terms of exposure, no multiplication of the crop factor of the ...
1
vote
6answers
4k views

What are the pros and cons of constant-aperture zoom lenses, for a relative beginner?

I use a Sony NEX-5R, and I bought the Sony 18-105 F4 constant-aperture lens. I'm aware that the constant-aperture F4 gathers more light than, say a F3.5 - 5.6, and it gives you more control over the ...
1
vote
3answers
5k views

Is there a way to adjust the aperture of a Nikon lens without a camera or physical aperture ring?

If I have a camera that does not have any electronic connection to the lens, is there any way to adjust the aperture on the lens if it does not have a physical aperture ring? We're using a scientific ...
1
vote
1answer
1k views

My Brand New Nikon 50mm f/1.8D giving problem

My lens is Nikkor 50mm f1.8D and camera is Nikon D7000. I bought the lens yesterday. (24.09.2013) In spite of setting the lens aperture locked at f22, as recommended, my Nikon D7000 camera apertures ...
0
votes
2answers
485 views

How to lock aperture using Reverse ring with Canon 600D?

Is there anyone using reverse ring and know how to lock the aperture. I tried doing the techniques provided on youtube. First connecting the lens on original positions then lock the aperture by ...
0
votes
1answer
2k views

What impact on image resolution does the aperture have?

What is the effects on depth of field, signal to noise ratio and image resolution when reducing the aperture?
0
votes
2answers
12k views

Why Small aperture (less light) has Large depth of field? [duplicate]

Possible Duplicate: Technically, why is the out of focus area blurred more when using a bigger aperture? I understand that a small aperture (large aperture number eg. F/22) means large ...