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Discussions

f/1.8 AND f/2.8 IN CAMERA LENSES

🌐 r/AskPhotography
13
May 12, 2023

The f-stop is a ratio based on the focal length and the actual size of the physical aperture (that is, the opening that lets the light in). For example, if you have a 50mm lens set to f/2, then the diameter of the actual aperture in the lens is 25mm (50/2).

It’s a bit counterintuitive at first, but remember that the smaller the f-number, the larger the opening. In your example, a 50mm lens at f/1.8 has an aperture of about 28mm, while at f/2.8, it has an aperture of about 18mm.

Those actual measurements, though, aren’t all that important. It’s more useful to think in terms of stops of light. Every “stop” represents a doubling (or halving) of the amount of light the lens lets in. For example, a lens at f/2 lets in twice as much light as a lens at f/2.8. And a lens at f/2.8 lets in twice as much light as a lens at f/4. You can see that it adds up quickly (the lens at f/2 is letting in four times as much light as the lens at f/4).

Looking at a chart like the one on this page can be useful as a guide for understanding stops.

Lenses with larger maximum apertures (that is, those with lower f-stops) are referred to as “faster” lenses, because the lower f-stop lets you use a faster shutter speed. As a practical matter, more light is good, but there are two important trade-offs. First, a faster aperture means a shallower depth of field (less of your scene in focus). If you’re trying to isolate your subject and blur the background, as you might with a portrait, for example, then a shallow depth of field is good. But if you want all of your scene in focus—say, for a landscape, or a street scene—then you need to stop down to a smaller aperture (that is, a larger f-number). Second, faster lenses are typically larger, heavier, and more expensive than their slower counterparts.

All that said, f/1.8 primes can often be the sweet spot for smaller affordable primes, and that’s a good place to start.

EDIT: By the way, if you’re just starting out, these videos are a great introduction to the exposure triangle, one side of which is the aperture.

EDIT 2: As to your question about events, a lot of event shooters use f/2.8 zooms, which combine a relatively fast aperture with the versatility of a zoom lens. I’m sure some use primes, too, although likely on a second (or third) camera. The f/2.8 zoom is the work horse.

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Gear Question: 1.8 vs 2.8

🌐 r/WeddingPhotography
24
May 20, 2020

Vague generalization, but 1.8s are often cheap plastic lenses. Whereas 2.8s are more often pro quality zooms.

The cheap plastic lenses can have awful aberration and muddy color and sharpness wide open, especially in low light, therefore to get the best quality out of your lens, you’ll probably be closer to 2.8 anyways.

1.4s, however, are much better lenses than 1.8s, and primes are generally better than zooms, but at the pro level it’s really hard to distinguish 2.8 primes vs 2.8 zoom.

With primes, I shoot around 1.8-2.2 often, and 1.4 in low light. 50 at 2.0 is probably my favorite look, but all primes look beautiful at 2.0.

Lastly, 1.4 to 2.8 is four times the amount of light transmission. That’s a big jump when you’re in the lowest light environments.

More on reddit.com
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Reddit
reddit.com › r/askphotography › f/1.8 and f/2.8 in camera lenses
r/AskPhotography on Reddit: f/1.8 AND f/2.8 IN CAMERA LENSES

The f-stop is a ratio based on the focal length and the actual size of the physical aperture (that is, the opening that lets the light in). For example, if you have a 50mm lens set to f/2, then the diameter of the actual aperture in the lens is 25mm (50/2).

It’s a bit counterintuitive at first, but remember that the smaller the f-number, the larger the opening. In your example, a 50mm lens at f/1.8 has an aperture of about 28mm, while at f/2.8, it has an aperture of about 18mm.

Those actual measurements, though, aren’t all that important. It’s more useful to think in terms of stops of light. Every “stop” represents a doubling (or halving) of the amount of light the lens lets in. For example, a lens at f/2 lets in twice as much light as a lens at f/2.8. And a lens at f/2.8 lets in twice as much light as a lens at f/4. You can see that it adds up quickly (the lens at f/2 is letting in four times as much light as the lens at f/4).

Looking at a chart like the one on this page can be useful as a guide for understanding stops.

Lenses with larger maximum apertures (that is, those with lower f-stops) are referred to as “faster” lenses, because the lower f-stop lets you use a faster shutter speed. As a practical matter, more light is good, but there are two important trade-offs. First, a faster aperture means a shallower depth of field (less of your scene in focus). If you’re trying to isolate your subject and blur the background, as you might with a portrait, for example, then a shallow depth of field is good. But if you want all of your scene in focus—say, for a landscape, or a street scene—then you need to stop down to a smaller aperture (that is, a larger f-number). Second, faster lenses are typically larger, heavier, and more expensive than their slower counterparts.

All that said, f/1.8 primes can often be the sweet spot for smaller affordable primes, and that’s a good place to start.

EDIT: By the way, if you’re just starting out, these videos are a great introduction to the exposure triangle, one side of which is the aperture.

EDIT 2: As to your question about events, a lot of event shooters use f/2.8 zooms, which combine a relatively fast aperture with the versatility of a zoom lens. I’m sure some use primes, too, although likely on a second (or third) camera. The f/2.8 zoom is the work horse.

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Dpreview
dpreview.com › forums › nikon slr lens talk
1.8 vs. 2.8 - How much difference?: Nikon SLR Lens Talk Forum: Digital Photography Review
October 7, 2019 - Expert news, reviews and videos of the latest digital cameras, lenses, accessories, and phones. Get answers to your questions in our photography forums.
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Nationwide Video
nationwidevideo.com › home › gear › brands › christie › christie projector lenses › christie dhd 1.8-2.8 / s+ 1.95-3.08 zoom lens
Christie DHD 1.8-2.8 / S+ 1.95-3.08 Zoom Lens - Nationwide Video
April 3, 2024 - When used with the Christie DHD700 & DHD800 projector this lens has a 1.8-2.8:1 throw ratio. If used with the Christie DS+750 the lens will provide a 1.95-3.08:1 throw ratio.
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CK-12 Foundation
ck12.org › all subjects › math grade 7 › add rational numbers › what's the sum of 2/8 + 1/8?
Flexi answers - What's the sum of 2/8 + 1/8? | CK-12 Foundation
December 18, 2024 - To find the sum of two fractions with the same denominator, you simply add the numerators and keep the denominator the same. So, @$\begin{align*}\frac{2}{8} + \frac{1}{8} = \frac{2+1}{8} = \frac{3}{8}\end{align*}@$. So, the sum of @$\begin{align*}\frac{2}{8}\end{align*}@$ and @$\begin{alig...
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MathHelper
mathhelper.us › 1over8 › plus › 2over8
What is 1/8 + 2/8?
A step-by-step solution to 1/8 plus 2/8, with the answer in fraction form.
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Reddit
reddit.com › r/weddingphotography › gear question: 1.8 vs 2.8
r/WeddingPhotography on Reddit: Gear Question: 1.8 vs 2.8

Vague generalization, but 1.8s are often cheap plastic lenses. Whereas 2.8s are more often pro quality zooms.

The cheap plastic lenses can have awful aberration and muddy color and sharpness wide open, especially in low light, therefore to get the best quality out of your lens, you’ll probably be closer to 2.8 anyways.

1.4s, however, are much better lenses than 1.8s, and primes are generally better than zooms, but at the pro level it’s really hard to distinguish 2.8 primes vs 2.8 zoom.

With primes, I shoot around 1.8-2.2 often, and 1.4 in low light. 50 at 2.0 is probably my favorite look, but all primes look beautiful at 2.0.

Lastly, 1.4 to 2.8 is four times the amount of light transmission. That’s a big jump when you’re in the lowest light environments.

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Microsoft
mathsolver.microsoft.com › en › solve-problem › 2.8 `times 1.8=
Solve 2.8*1.8
Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.
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Mathway
mathway.com › popular-problems › Basic Math › 93194
Simplify 2 1/8-1 7/8 | Mathway
Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.
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Quora
quora.com › Whats-better-for-portraits-an-f-1-8-aperture-or-an-f-2-8-aperture-on-a-zoom-lens
What's better for portraits: an f/1.8 aperture or an f/2.8 aperture on a zoom lens? - Quora
October 27, 2022 - Answer (1 of 4): Portraiture is about lighting, composition, and the connection with the subject. Aperture is a relatively minor concern. I generally prefer wide aperture prime lenses for portrait work, but there’s nothing wrong with a f/2.8 or slower zoom.
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Byjus
byjus.com › home › the valency of the element having electronic configuration 2,8,8,1 is
The valency of the element having electronic configuration 2,8,8,1 is

The correct option is D 1 The atomic number of 2,8,8,1 electronic configuration is 19 and the distribution of electrons according to Bohr and Bury suggestion ...

Answer from BYJU'S on byjus.com
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Quora
quora.com › Why-are-the-electrons-of-potassium-2-8-8-1-instead-of-2-8-9-since-the-M-shell-has-a-maximum-of-18-electrons-according-to-2n-2
Why are the electrons of potassium 2 8 8 1, instead of 2 8 9, since the M-shell has a maximum of 18 electrons (according to 2n^2)? - Quora
December 22, 2020 - Answer (1 of 4): The geometry of hemispheres is missing part. Your formula is missing that a 3D structure can overlay a 2nd layer at the same count. That is ‘according to’ 2*[(roundup([n+1]/2))^2] The causation of rows in the Periodic Table of Elements is based upon the 3D structure of ...
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Christiedigital
christiedigital.com › products › end-of-support › lenses › 1.8-2.81sxga-1.95-3.081-standard-lens
1.8 - 2.8:1/SXGA+ 1.95-3.08:1 Standard Lens | Christie - Audio Visual Solutions
When used with the Christie DHD700 & DHD 800 projector this lens has a 1.8-2.8:1 throw ratio. If used with the Christie DS+750 the lens will provide a 1.95-3.08:1 throw ratio.