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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.

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5
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1answer
610 views

What are some good examples of using ND filter with wide apertures?

Usually pictures shot with ND filters look like this one. The typical recommendation is to combine ND filter with narrow aperture to get slower shutter speed. This results in a very big depth of ...
20
votes
9answers
3k views

What's the benefit of a tiny aperture?

In this answer to another question Rob Clement wrote: Think background first. What story do you want to tell? Epic background, big mountains. Looking to deliver a sense of grandeur with your ...
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 ...
0
votes
1answer
510 views

How to know the F-Stop in a Webcam? [closed]

I'm looking for a Webcam with large aperture and shallow depth of field, similar to the F 1.8 Canon lenses, so far It has been really difficult since most of the specifications for any webcam are ...
9
votes
4answers
6k views

What is a “small” aperture?

It happens a lot. People refer to the aperture being small (or big!). By default does this imply a small opening of the iris (literal aperture), or a small f-value (how the aperture is measured, for ...
0
votes
6answers
401 views

Is the low-light advantage of larger sensors attributable to the sensor itself or to the larger aperture of the lenses? [closed]

Let's say I take a photo using an APS-C camera and using an FF camera, from the same position, with the same ISO and shutter speed. Let's say I use a 50mm focal length for the FF camera. To match the ...
6
votes
1answer
1k views

How to calculate the optimal pinhole size?

As far as I've understood, optimal diameter for pinhole size is calculated by formula where d - the optimal diameter for pinhole c - constant f - focal length (distance between pinhole and ...
4
votes
4answers
385 views

Why does the Canon G7 allow faster shutter speed settings only at slower apertures?

I have a Canon PowerShot G7 camera. In Manual mode it supports 1/2500s shutter speed at f/8.0, whereas at f/2.5 it supports only upto 1/1600. But, should it not support higher shutter speed at higher ...
-3
votes
1answer
255 views

How to use 75-300mm lens [closed]

I have 75-300mm lens but I don't know how to set the aperture,ISO,,shutter speed Can I get better shots with this lens Can I get some tips to use this lens
10
votes
8answers
7k views

What is the fastest lens available for a DSLR?

I've seen references to f1.2 lenses. I was wondering, are there any faster lenses available for a DSLR mount?
0
votes
2answers
117 views

How do i select right exposure? [duplicate]

I have canon EOS 600D and also I have following lenses: 18-55mm 55-250mm 40mm f/2.8 How do I select correct exposure. what is the sequence of priory. currently I first changing the iso, ...
7
votes
4answers
4k views

How important is a fast aperture in a wide angle lens?

I am looking for a good wide angle lens: I am looking at the Sigma 8-16. It has great reviews, by far the widest angle I can get on my camera. Only thing I am worried about is the relatively low ...
4
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 ...
-1
votes
1answer
115 views

What is the difference between f/6 in dx and fx lens? [closed]

What is the difference between f/6 or f/1.8 in dx and fx nikkor lens?
2
votes
2answers
86 views

How can I use control over the aperture to take better photos?

I upgraded from a point-and-shoot to a Sony NEX a few months back. I think I've made substantial progress with regards to many aspects of photography like composition, the rule of thirds, ISO, ...
3
votes
2answers
1k views

Why didn't I get bokeh with my 50mm f1.8?

Recently I took a photograph at an aperture of f/1.8, but there was very little bokeh. The shot was of a wave with a few boats in the background. Everything seems to be clear even at f/1.8. Can ...
9
votes
4answers
716 views

What is the technical name for a zoom lens which has a fixed maximum aperture?

What is the technical name for a lens which has the same maximum aperture throughout the entire zoom range?
0
votes
1answer
509 views

Nikon D70, can I use manual aperture ring without getting the FEE error?

I'm trying to use a Nikkor AF 35-105 zoom lens on a Nikon D70, and if I try to move the aperture ring from the minimum (f/22) I get the FEE error. Now, I seem to understand that it means that the ...
4
votes
4answers
432 views

Who tells my camera which apertures my lens has

When I mount one of my lenses on my camera, my camera knows which apertures the lens has. So I ask my self: Why does my camera know that for example lens XY has a max. aperture of 2.8 and a min. ...
1
vote
1answer
2k views

Canon 24-70mm 2.8f - Optimal aperture for sharper pictures

I always have trouble getting sharper images from my 24-70 lens. I have watched numerous YouTube videos to correct this and its improved but not completely corrected. I am going on a trip and don’t ...
1
vote
2answers
239 views

How does aperture/DOF affect continuous autofocus?

When the autofocus system is deciding to adjust the focus, say in a situation of the subject getting closer to or farther from the lens, does it take into consideration the current depth of field, ...
5
votes
5answers
404 views
0
votes
2answers
548 views

how to select a proper aperture for 50mm portrait lens? [duplicate]

I am using 50 mm 1.8 potrait lens with my canon 600D. But when i take a portrait with f1.8 on Av mode using autofocus, only subjects eyes are sharp and rest of the other face is slightly blurry. How ...
1
vote
2answers
620 views

How significant is the difference between Canon 5D and Canon 5D Mark II when using the same lens at open aperture?

Recently I've asked about the difference between two lenses on open apertures: Why do two lenses with the same F-number give different amount of light? We realized that DSLRs gain the real ISO ...
2
votes
2answers
853 views

Why does oil leak from the aperture ring of old lenses?

I'm assuming that the oil was there initially to lubricate the aperture blades, but why does it leak out?
19
votes
5answers
1k views

Why do two lenses with the same F-number give different amount of light?

Why do the following two lenses provide different amount of light? In both images we have fixed focusing distance, distance to the object, ISO, shutter speed and F-number.
1
vote
2answers
498 views

Help me understand effective f-number

If I set a lens to, say, f/2 but my focus is set to its closest point, my effective f-number won't be f/2 any more but it will be higher by a factor that depends on focal length, image magnification ...
1
vote
3answers
373 views

Can I estimate the light gathering power of a lens by measuring size of entrance pupil?

Supposing I have an unknown lens of which I don't know f/# and focal length. I want to estimate the total amount of light that my lens can collect which, I believe, is given by the solid angle that my ...
1
vote
1answer
888 views

Size of the entrance pupil vs size of the aperture

I understand that the entrance pupil is the image of the aperture as seen from the front of the lens. However, is the size of the entrance pupil the same as the size of the effective aperture? In ...
3
votes
1answer
210 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 ...
12
votes
4answers
1k views

Is there a noticable difference in sharpness between a 1.8 lens and a 2.8 of similar design?

I recently bought a second-hand Carl Zeiss Jena PANCOLAR MC 1.8/50mm Lens off eBay (still waiting for it to arrive though) and am going to mount it to my Canon 7D via a M42 adaptor. I primarily shoot ...
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 ...
7
votes
6answers
7k views

What aperture should I use to photograph people and why?

What f/# do you use to photograph people, and why? I know this varies from shot to shot. Let's suppose that you are photographing either a single person or a couple, that it it outside on a somewhat ...
1
vote
2answers
399 views

Does aperture affect a cameras vignetting?

I'm hoping I can get some better insight into how my camera works and how I can apply it in the future. I have a custom built camera with a Canon EF 200 lens mounted to it. The camera allows me to ...
10
votes
1answer
3k views

What is a “De-clicked” aperture control ring?

The Samyang 85mm T1.5 Cine Lens featured a "De-clicked" aperture control ring. What exactly is it?
1
vote
3answers
118 views

How does time of exposure relate to aperture? [duplicate]

I was trying to derive the relation between the aperture and time of exposure. I'm taking two apertures f/2 and f/4. From the formula A α 1/√t I got, f/2 α 1/√t1 -> A and f/4 α ...
1
vote
5answers
4k views

is the Nikon 35mm f/1.8 worth it after i have the kit lenses? [duplicate]

I have a Nikon DX (D5100) camera with the two most basic kit lenses: 18-55mm f/3.5-5.6 VR and 55-200mm f/4-5.6 VR. These two lenses cover lots of scenarios, but I'm starting to believe there is more ...
-3
votes
2answers
96 views

Want to know about F/8-F/11 in-spite of aperture? [closed]

I just grab some information about the best fit of aperture, can we make something different between F/8 & F/11.According to my best knowledge and past photography experience that when we make our ...
0
votes
3answers
2k views

What is the diameter of the lens' aperture in mm terms?

I'm planning to create a customized aperture effect. Like this one in the Photo. I'll be doing a DIY customized aperture that will be attached to the filter. My lens' widest aperture is F/1.8 ...
4
votes
4answers
4k views

Which aperture is the sharpest in the lens that come with Nikon d3100?

Wich aperture is the sharpest in the lens that come with Nikon d3100? I'm new to photograpy and I read about the "sharpest aperture" property that lenses have, but I read it changes depending on the ...
17
votes
5answers
3k views

How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.6?

I made a series of outdoor shots with Nikon D5000, with the 18-55mm 1:3.5-5.6G VR kit lens. On some shots, I see in the EXIF info f/11, and in another shot, f/9. How can that be, that the f-number ...
5
votes
1answer
1k views

Why do Canon lenses stay wide open when off camera, but Nikkor lenses keep tight aperture?

I have only noticed this for a handful of lenses so I am probably wrong in saying that all Nikon and all Canon lenses follow suit. But from those I have seen, Nikon tend to close the iris when removed ...
3
votes
2answers
1k views

What's the difference between real and effective aperture?

I understand that the simple idea that f-stop is focal length divided by aperture really applies to a simple single-glass lens, not the compound lens systems used to provide good image quality in ...
7
votes
3answers
1k views

Why is F/8-F/11 called a “Who cares aperture”?

I've read for the second time this morning that whenever we don't know which aperture would fit best, we should take something between f/8 and f/11. Now my logic would dictate me to set an aperture ...
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
109 views

Correct aperture to manage precisely blur and focus zones

There is something that bugs me about aperture... I understood that aperture will influence my picture on both light and focus zone. Now when taking a picture, I find it difficult to know precisely ...
0
votes
2answers
2k views

Settings for the Canon EF 100mm f/2.8L IS USM Macro Lens (both macro and portrait)?

I have a crop body camera (Canon T3i) and I'm renting the Canon EF 100mm f/2.8L IS USM Macro Lens for the weekend. I hope to use it for both macro shots and portraits. Can you recommend an aperture ...
8
votes
2answers
1k views

Do lenses with the same f-stop but different focal length gather the same amount of light? [duplicate]

I'm taking images of a light source in a scientific labratory, and I thought I had a good grasp on all these things, but now i'm second guessing myself after some results. The most important thing is ...
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 ...
0
votes
2answers
133 views

Does a larger aperture automatically mean a bigger shot?

Say I take a photo with a camera that has the aperture and lens of, say, a camera specifically designed for wide-shots and large display ratios to capture more elements, such as a motion picture ...