What Does F/2.8 Mean In Lenses

By | 08/09/2022

what does f/2.viii mean?

Re: what does f/2.8 mean?

what does f/2.8 hateful?

I am confusing what dose f/ii.8 – f/3.5 means? And How do I know how fast is a paticular lense? I hear lots of people proverb your lense is not fast enough to use under low lite or sports enviroment. Could anyone help me to clearfy this technical problem? Thanks in Advance!!

Alex

Ryoohki •

Contributing Member

• Posts: 890

Re: what does f/two.8 mean?

The F is the size of the Opening that tin get light thru the lens to the sensor.

The Smaller the F is, the larger it open thus expert for depression light. Small F with good glass cost more than than standard 3.5/5.half dozen ones.

The more light get in, the meliorate it is for the camera speed so it’due south faster.

Shih-Hsung Hwu

wrote:

I am disruptive what dose f/2.8 – f/iii.5 ways? And How do I know how

fast is a paticular lense? I hear lots of people saying your lense

is not fast enough to use under low calorie-free or sports enviroment.

Could anyone aid me to clearfy this technical problem? Thank you in

Advance!!

Alex

Freeman-Jo •

Senior Member

• Posts: 2,584

Re: what does f/2.viii mean?

While you are there, look upward depth of field also, it goes together. And probably brand you understand better.

http://www.dpreview.com/acquire/?/Glossary/Optical/Depth_of_field_01.htm

Martin Eager

wrote:

http://www.dpreview.com/learn/?/Glossary/Exposure/Aperture_01.htm

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f/ii.8 = will cost monthly salary divided past 2.8 – And L means yearly salary

Shih-Hsung Hwu

wrote:

I am confusing what dose f/2.8 – f/three.v means? And How do I know how

fast is a paticular lense? I hear lots of people maxim your lense

is not fast enough to employ under low light or sports enviroment.

Could anyone assistance me to clearfy this technical problem? Cheers in

Advance!!

Alex

Freeman-Jo •

Senior Fellow member

• Posts: 2,584

Interesting, merely how did you effigy that you, my bacon is probably higher than your!

Povl H. Pedersen

wrote:

Shih-Hsung Hwu

wrote:

I am disruptive what dose f/2.8 – f/3.5 means? And How do I know how

fast is a paticular lense? I hear lots of people proverb your lense

is not fast enough to use under low lite or sports enviroment.

Could anyone aid me to clearfy this technical problem? Thanks in

Accelerate!!

Alex

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I love Michelle Kwan



Canon PowerShot G1 X



Canon G7 10 Two



Canon EOS-1D Mark III



Catechism EOS 5D Mark II



Catechism EOS 5D Marker 3

+8 more

Doug Kerr •

Forum Pro

• Posts: 20,899

Re: what does f/2.8 mean?

Alex,

Shih-Hsung Hwu

wrote:

I am confusing what dose f/2.8 – f/iii.5 means? And How do I know how

fast is a paticular lense? I hear lots of people proverb your lense

is non fast enough to use under depression light or sports enviroment.

Could anyone help me to clearfy this technical problem? Thank you in

Advance!!

f/two.8 ways that the effective diameter of the discontinuity is the focal length of the lens divided by 2.eight. If we set aside a couple of small wrinkles, information technology tells us the “light-gatherng power” of the lens. The smaller the f/number, the larger the discontinuity (and the greater the light-gathering power).

Leneses with larger apertures are often spoken of every bit “faster”, since the larger discontinuity allows proper exposure to be accomplished with a shroter exposure (faster shutter speed).

When the description of a zoom lens includes two f/ numbers (such every bit 28-105 mm F/3.5-4.five), it means that at teh wide angle stop of the focal length range, the aperture is f/3.5, while at the telephoto end, it is f/4.5.

Best regards,

Doug