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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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2
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4answers
751 views

Simply bad focus or too big aperture?

I have made a mistake with this image: ISO 400 | 1/1700s | f/2 I used manual Aperture mode and set it to F/2 (now I believe this is too much). Kids were one meter away. It was light cloudy ...
0
votes
0answers
70 views

Anyone know how to save a Photoshop file, naming it from metadata or exifdata?

Thanks for any feedback in advance. I have an action that retrieves an image from Aperture, manipulates it, saves it back to the Aperture library in tiff format, then performs a save for web with an ...
0
votes
1answer
60 views

What is Aperture in Camera? [duplicate]

This is first of my few questions coming up on cameras. I cannot ask all in one question as they relate to different topics. My first question: What is Aperture in Camera? Why Having a bigger ...
3
votes
3answers
288 views

Why is actual exposure changing as I go from one extreme to the other in aperture priority mode?

I just got my first DSLR, Nikon D5200 and after reading various tutorials and understanding basics of Exposure Triangle, I was out for testing my knowledge to get a practical view of how things get ...
39
votes
8answers
81k views

What is aperture, and how does it affect my photographs?

How does aperture affect my photographs? Why should I care about the aperture with which a photo was taken?
3
votes
2answers
299 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 ...
16
votes
2answers
1k views

Does a specific f number across all lenses denote same amount of light?

When we say a light source emits 1500 lumens of light, it does not really matter if the light source is incandescent, CFL, diode etc. Similarly, when I say f/1.8 can I assume that all lenses pass the ...
6
votes
3answers
1k views

Is there any practical way to measure the T-stop of a lens?

T-stop measures actual light transmission in a lens. Therefore, different f/2.8 lenses can have different T-stops. T-stops are usually only given for cine lenses. For photography lenses, is there any ...
18
votes
2answers
12k views

What is T-number / T-stop?

Usually, when discussing aperture of a lens, F-stop and F-number are used for quantifying. But some photographers, and especially videographers, also mention T-stop. The concept and numbering used ...
3
votes
1answer
78 views

Can Nikon PK-11a extension tubes be used with G lenses, keeping aperture control?

I own a D3200 and 3 G lenses (kit lenses + 35mm f1.8G) and I was wondering if I could use an extension tube PK-11a with them keeping aperture control functional. At Nikon website seems to say no, but ...
3
votes
4answers
106 views

How can I further decrease the exposure in a studio environment?

I was trying a few things yesterday involving a studio backdrop which was lit using a grid to provide a gradient effect and a subject about 3ft in front of it, with its own lighting through umbrellas. ...
0
votes
2answers
122 views

Why are only certain values used for the aperture?

Why are only certain aperture values (i.e. 1.4, 2.0, 2.8, 4, 5.6, 8, 11, 16, 22) used? Is there a reason we can't use anything other than those values - for example, 1.8 or 2.7?
1
vote
3answers
231 views

What factors make a lens brighter? [duplicate]

Let's say I have two lenses of 50mm, one with maximum aperture f/1.8 and another with f/1.4. I understand that when using maximum aperture, for the latter lens more light will get to the film or ...
2
votes
2answers
136 views

Automatic Depth-of-Field in modern cameras?

What modern cameras (DSLR or mirrorless) have automatic depth of field exposure setting functionality? It would be desirable for example to specify a desired DOF based on subject size (or 'depth') ...
6
votes
5answers
2k views

Is it possible to change depth of field in RAW images?

I am beginner to photography, and I've learnt that we can do a lot of post-production in images by using RAW format. I'm looking for options to change/modify the depth of field in the RAW images - is ...
4
votes
2answers
176 views

How can I more consistently focus on the point I want?

I've had so many wonderfully composed images turn out lousy because my AF isn't as accurate as I'd like (or I don't know how to wield it). Despite using single-point AF, my focus point is often ...
2
votes
4answers
225 views

Since IQ is better at smaller apertures, and backgrounds can be blurred digitally, why not always shoot stopped down?

Is it correct to say that picture quality is better with small f number, but with very small DOF, this perfect quality degrades very quickly? So, is there any reason to shoot with wider aperture ...
1
vote
8answers
53k views

How to change aperture in manual mode on an entry-level Nikon SLR?

In manual mode on my Nikon D3200 I cannot change just the f/stop setting. It only changes in relation to the other settings. How can I reproduce settings that I have found in books on photography if I ...
4
votes
1answer
666 views

Why does changing the aperture cause lag in live view and in videos?

On my Canon 70D there's a considerable lag during the change of aperture when pressing the depth of field preview button. This lag also occurs during video recording, which causes the video to halt ...
0
votes
2answers
99 views

I must teach someone how a dSLR works at work. Where can I find an animation for this? [closed]

I must teach someone how a dSLR works at work. So YouTube, Vimeo and, generally, videos are banned. My 'apprentice' is smart, however I feel that he needs an animation with a 'transparent' (CGI) dSLR ...
0
votes
3answers
119 views

ANDCamera problem: brightness malfunctioning [duplicate]

I am a newbie photographer and had a question that has been plaguing me for some time now. My NIKON D3100 camera's brightness meter (the lines that change on manual mode when one adjusts shutter ...
1
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0answers
44 views

What are the limitations which stop Canon/Nikon producing F1.8 Zoom lenses? [duplicate]

Why is it that Canon/Nikon/Sony etc aren't able to, or dont (because of cost) produce F1.8 capable zoom lenses? Or do they?
4
votes
5answers
2k views

Are there ultra-wide angle (<24mm) lenses faster than f/2.8? If not, why?

I started looking for an UWA lens (something in the mid-teens), particularly for doing milky way shots. Learning that you get trails with too long of exposure, I figured I'd try and find the largest ...
3
votes
1answer
123 views

Change aperture of EF lenses without an EOS body

I'm looking to adapt my Canon EF mount lenses for other mirrorless mounts. Not all of them are made by Canon (some are Sigma lenses). I'm not really interested in keeping autofocus; a mere spacer as ...
0
votes
0answers
20 views

Settings for getting the actual color of a garment in clothes photography [duplicate]

I am shooting clothing laying on the floor on a white background. 2 softboxes of 350W each light the garment. The rest is my Nikon D40 with a 18-105mm lens. However the color of the garment is not ...
0
votes
6answers
194 views

Is the wide aperture and bokeh of a 50mm prime more important than getting to the 70-90mm range for portraits?

I've a Pentax K-30 with the following lens: Pentax-M 50mm 1.7 manual focus Tamron 17-50mm 2.8 autofocus Pentax 55-300mm 4-5.6 autofocus Considering that : Pentax 50mm has the nicest bokeh and ...
1
vote
1answer
59 views

Mathematical relation between aperture and DOF [duplicate]

I know that aperture and DOF are inversely proportional. But, can anybody explain to me the Physics/Optics behind that? What's the mathematical relation that relates aperture with DOF?
0
votes
0answers
24 views

What does it mean to be out of focus [duplicate]

I have browsed dozens of photography and noticed that only a handful actually try to reconcile the photography world with the real world. My ultimate goal is to be able to easily explain to anyone, of ...
14
votes
2answers
3k views

How do DSLRs figure out what aperture to select in P mode?

In program mode, DSLRs adjust not only the ISO and the shutter speed, but also the aperture. The aperture has a huge impact in some situations. For example, when shooting a close subject in front of ...
1
vote
2answers
269 views

Why can't I change Aperture? Canon 60D

I am in manual mode (M on the top left scroll wheel above the on button) using a sigma 10-20mm F4-5.6 and then I spin the scroll wheel (which has a "set" button in the middle) below the 'q' button, ...
0
votes
1answer
118 views

Technique to manually set aperture and focus for a low light scene during normally lit time of day?

I have a scenario that requires manually setting the aperture and focus on a lens attached to a machine vision camera on an outdoor scene (mirrorless camera with global shutter). I need to manually ...
0
votes
1answer
549 views

How to remove oil from aperture blades?

If you go on ebay or other second hand places, you'll see a fair amount of lenses that have oil on the aperture (particularly on older lenses). I've done some reading and it looks like this oil is ...
1
vote
1answer
479 views

How to manually select aperture and shutter speed but have auto ISO on a Canon 7D?

I want to be able to manually adjust aperture and shutter speed, but leave ISO being set automatically. How can I do this on my Canon 7D?
2
votes
2answers
8k views

Canon 50mm f/1.8 STM vs Canon 50mm f/1.8 II?

What are difference between canon 50 mm f/1.8 STM vs canon 50 mm f/1.8 II ? which is better to buy?
6
votes
2answers
186 views

How does sensor size affect the brightness of an image given the same field of view and aperture?

Lets say we have two image sensors, each one with 1MPixel resolution but differing in size. The first sensor has the size 1/3", the other one 1". Each sensor is equipped with a suitable lens (for the ...
7
votes
1answer
145 views

What's the point of a shutter when the sensor is clearly working all the time to provide live view?

Something I don't understand about compact digital cameras is how their shutters work. On the screen at the back of the camera, a preview is constantly shown. I assume this preview is made by light ...
3
votes
2answers
212 views

How does the Sony 135 F2.8 [T4.5] STF twin aperture lens design work?

I stumbled across the Sony 135 F2.8 [T4.5] STF other day. I have read through the review but I can't for the life of me figure out what the twin-aperture setup is supposed to do!
0
votes
3answers
3k views

Why doesn't an f/1.8 lens result in a lower ISO than an f/2.8 lens?

When I bought my Sony NEX-5R, I had a choice of an f/1.8 or an f/2.8 lens (both are prime, normal lenses). I was told the 1.8 will work better for low-light photography since it will let in lot more ...
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 ...
11
votes
3answers
579 views

What is the limiting factor in lens construction when it comes to f-stop values?

This widely praised Nikon 105mm macro lens has a maximum f-stop value of 2.8. I've held it in my hands, it's a big lens. Meanwhile, this 50mm Nikon lens can go up to f/1.2, despite being 25% cheaper ...
7
votes
4answers
4k views

What are the advantages of a lens having a fixed maximum aperture?

What are the advantages of a lens having a Fixed Maximum Aperture? Previous answers have indicated that "pros tend to want constant apertures in zoom lenses". While in general lenses with a fixed ...
2
votes
2answers
205 views

Why does my lens refocus when the f-stop is changed?

I have a prime Sigma f1.4 50mm lens on my Nikon D90 in P mode and focus mode on a set point of the field and notice that when I am using a tripod and change the f-stop that the camera changes the ...
0
votes
1answer
5k views

Why can't I adjust the aperture in manual mode on my 5D MkII?

Lately I have been having trouble adjusting my aperture when my 5 d mark 2 is in manual mode. Usually I am able to turn the thick dial at the back of the camera and adjust the aperture. Lately this is ...
3
votes
3answers
2k views

What would be a good indoor setup to find a lens's sharpest aperture?

I read the whole of How do you find out the "sweet spot" of a lens? — great question and answer, but it didn't discuss a potential homemade rig for finding the sharpness aperture of my ...
13
votes
7answers
689 views

Does lens speed still increase meaningfully when the physical aperture is larger than the sensor size?

This question came to me this morning, thinking about 50mm lenses. I have the Pentax 50mm f/1.7 (manual) and it's a very nice lens, but would be considered (relatively) slow on 35mm film, and many ...
0
votes
1answer
116 views

Getting a sharp focus on a 50mm when the subject is at 5m - 10m [duplicate]

I'm a novice photographer with a 450D/XSi. I'm using a 50mm/1.8 prime lens to start out and I noticed that a lot of times my pictures end up not being sharp for stationary scenes. I was mostly using ...
3
votes
1answer
103 views

Why is the sharpness of a lens often determined by aperture?

Related to: How do you find out the "sweet spot" of a lens? I am wondering why most lenses resolve finer detail when stopped down a bit. Further, after the "sweet spot", after stopping ...
0
votes
1answer
86 views

Nikon D3 - Cycling of aperture values

I have a rather trusty Nikon D3, we've been through 180k actuations together. But I have a question, which i'm really hoping i've not been missing all these years. Is there a way to program the body ...
0
votes
1answer
138 views

Photos imported into Aperture aren't showing up — why not?

I imported about 500 images into Aperture (mostly CR2, but some jpg), and for some reason they're not showing up in my library. If I right click on my library and select "Show Package Contents" and ...
0
votes
1answer
97 views

I want to know about the relationship between focal length and aperture [duplicate]

I have Nikon D7000 and I know the basic relation of shutter speed, aperture, and iso. All I want to know is focal length and aperture relation. As I zoom in the camera the f/stop increases (e.g. it ...