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by Bart Arondson

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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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5answers
1k 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
111 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!
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2answers
84 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 ...
2
votes
2answers
263 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 ...
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3answers
386 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
933 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 ...
16
votes
5answers
2k 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
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1answer
518 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
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2answers
441 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
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3answers
818 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
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3answers
2k 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
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1answer
98 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
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2answers
772 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 ...
7
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2answers
553 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
587 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
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2answers
125 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 ...
2
votes
2answers
288 views

How do metering and aperture setting play together in manual mode (Minolta X-700)?

I have been playing around with my mother's Minolta X-700 (objective: Minolta MD 50 mm f/1.7) and though I read the manual (here it is: Manual X-700), I am still unclear about one thing: When I use ...
2
votes
4answers
522 views

Are there any lenses have smaller apertures than f/32?

While most photographers prefer fast lenses that range down to f/1.2, are there any lenses that go smaller than f/32? If there are, what is so special about those lenses that an aperture of f/32 ...
2
votes
1answer
156 views

Aperture value appears as '- -' in Olympus E410

I have just started using manual focus and prime lenses with my Olympus E410 (four-thirds). Intermittently, the aperture value is invisible, both through the viewfinder and in the LCD display. ...
2
votes
1answer
318 views

How to fix stuck aperture?

I have a Micro-Nikkor 55 mm 1:2.8 lens. The aperture appears to be stuck. Is it worth trying to repair the lens? Are there any good guides for disassembling the lens?
7
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7answers
15k views

Why is my Nikon 50mm f/1.8 giving me an fEE error?

I have a AF Nikkor 50mm f/1.8. When I have the aperture setting on the lens to 22 I can take photos. But when I change the dial to anything other than 22(lowest f/stop) then I get a flashing fEE ...
3
votes
4answers
382 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 ...
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3answers
292 views

How is the F stop number derived?

How are F Stop numbers derived? I have both a Canon 50d and a Panasonic DMC-LZ8k, a compact with full manual mode. When I set all settings but shutter speed identically between cameras, I end up with ...
11
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4answers
578 views

Why aren't lenses designed with extra large apertures for autofocus beyond what's used for imaging?

Historically, designing large-aperture lenses has been difficult because correcting the optical aberrations that arise from large apertures requires complex designs and very large amounts of glass. ...
2
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4answers
605 views

What is the best order to set exposure parameters (ISO, aperture, shutter)? [duplicate]

Let's say that you're in a very controlled environment, there is no hurry to get the shot, and you're shooting manual. In order to correctly expose the photo, what order should you alter the ISO (if ...
1
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0answers
38 views

Why is aperture built into the lens and not the camera? [duplicate]

Maybe this is physically impossible, but I'm curious why cameras have been designed where the aperture is controlled in the lens rather than in the camera like the shutter. Wouldn't building this in ...
10
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3answers
389 views

ND filter vs stopping down for long exposures?

To achieve long exposures in daylight, one might need to stop down, or use an ND filter. By stopping down, the depth of field increases, but at some point the image quality/sharpness will suffer, due ...
16
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6answers
2k views

Can a smaller sensor's “crop factor” be used to calculate the exact increase in depth of field?

If APS-C and similar crop-sensor digital cameras have a focal length multiplying effect such that a 50mm lens has an apparent focal length closer to the field of view of an 80mm on a full frame ...
2
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4answers
2k views

What is the best way to photograph a marathon?

I've had trouble finding information on how to best photograph action at a marathon. I don't mean tips for finding locations, ideas, etc, but rather technical tips for a beginning photographer to ...
2
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1answer
192 views

Why do the Nikon V1 lens' websites seem to give different f-stops than the lenses? [duplicate]

Possible Duplicate: How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.5? I am a recent (and so far quite pleased) owner of a Nikon V1. I am in the process of ...
0
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3answers
329 views

Image stabilization versus aperture [duplicate]

I want to do hand-held, natural-light photography in low-light situations, e.g. inside a room with a small window on a rainy day. No tripod, no flash. Canon claims that their "Optical Image ...
3
votes
1answer
294 views

How do I properly understand what f-stop is? [duplicate]

I don't quite understand why most lenses seem to have approximately the same diameter aperture regardless of focal length. F-stop is, by definition, a ratio of focal length to diameter, so a 20mm ...
3
votes
4answers
908 views

Does micro 4/3 have an advantage in low light due to aperture equivilence?

Recent Micro Four/Thirds sensors seem to have improved their noise performance significantly. I own a Canon 5D Mark 2 full frame DSLR and am considering purchasing an Olympus OM-D EM5 micro four ...
4
votes
4answers
737 views

What is the optimal “default” aperture value in AV mode?

This is a very basic question.I am trying to learn how to use AV and TV modes with my T3i (after 2 years of shooting in Auto). What should I set my aperture to in order achieve the best results? I ...
4
votes
5answers
631 views

How do I find the right motion blur/depth of field trade off in sports photography?

I could be wrong but when doing sports photography I'm always thinking about the following trade off: A fast shutter speed to freeze the action. A small(er) aperture to increase DOF and thus ...
24
votes
4answers
3k views

How do you find out the “sweet spot” of a lens?

I've tried googling this, but have never found a satisfactory answer. I've heard the term "sweet spot" thrown around by some photographers to mean the f-stop of a lens which results in the highest ...
0
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1answer
158 views

What are the biases in daytime and nighttime landscape mode?

What are the biases in day and nighttime landscape auto modes in terms of aperture, iso and shutter speeds?
6
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3answers
163 views

Does the time required to stop down the aperture affect the shutter response time?

In a (D)SLR. When pressing the shutter release button the camera must first move the diaphragm to the required setting. When a small aperture is selected it has to move it more than when you shoot ...
8
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6answers
3k views

Technically, why is the out of focus area blurred more when using a bigger aperture?

I'm wondering, technically, why and how does the out of focus areas blur more when using a bigger aperture. I think it'd help a lot if I presented a problem that's been driving me nuts for a long ...
1
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4answers
279 views

Does an aperture value exist, where a lens creates a brighter image than the real view?

So (without limitations of the viewfinder for example) looking through the viewfinder creates a brighter image than normal view would be. The lens would then work like a funnel(collects light from ...
15
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2answers
758 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 ...
28
votes
4answers
2k views

How does aperture work without “cropping” the image hitting the sensor?

I've been teaching myself the various settings in cameras and now have a much fuller understanding of how to use my camera effectively, but one thing is still bugging me. When the aperture size is ...
18
votes
3answers
1k views

Do smaller apertures provide more depth of field past the diffraction limit, even if peak sharpness suffers?

In Understanding Exposure (3rd edition, on page 48), Bryan Peterson has what might be called a rant against modern on-line conventional wisdom about diffraction limits. Answers on this web site are ...
4
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2answers
2k views

Why does higher aperture (less light) make an image sharper?

Why does higher aperture, less light, make an image sharper? Or rather make everything in focus? And how does this lead to lenses having a sweet spot in sharpness?
1
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3answers
370 views

What's the difference between a closed and open aperture diaphragm for night street photos?

I'm capturing a picture during night and to a street with a lot of cars running over the street. What happens (in general, from a theoretical point of view) if I shoot the same photo under the ...
5
votes
2answers
781 views

What's the base f-stop when counting an ideal f-stop for lens?

I've read a lot around this site that an ideal quality of the lens is achieved when using f-stop roughly 2 stops slower than the fastest value of the lens. Firstly, I'm not exactly sure what "2 ...
3
votes
1answer
112 views

Can custom (or any) function override aperture on a Canon 7D?

I'm a new owner (1 week) of a Canon 7D and a 28-135 USM lens. While experimenting and just shooting randomly, I was surprised to see my aperture setting (through the viewfinder) showing me a 2.8. Is ...
14
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3answers
1k views

Do the same camera settings lead to the same exposure across different sensor sizes?

Let's say I have a micro-4/3rd camera and a full frame camera, both set to 1/60 at f/2.8, taking a picture of the same scene in the same lighting. Will the exposure be the same across both cameras ...
-2
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1answer
419 views

Why are some original files unavailable for export from Aperture?

I started using Aperture a year ago. I never spent any time watching Lynda.com or anything else, I just thought I figured the darn thing out, as far as downloading images. I plug my phone or Canon ...
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3answers
347 views

Is it possible to calculate focal length if you know the aperture?

I need focal length (for my IA homework), but I didn't know that in real world I would only get the aperture. Ok, my camera is an Olympus X-21, and manual says: -----Olympus lens: 6.3 to 18.9 mm, ...