Question on lens

[Adrian Teo]

Hi, I have a EF-S55-250mm f4-5.6 IS

Does the "f4-5.6" refer to the aperture?

Does this mean that when I am using the lens, I must set the camera's apperture to within the f4-5.6 range?

What happens if I set the camera's aperture outside the range?

Thanks in advance

 

[FrancisGabriel]

it means that at 55, the biggest/ max aperture is 4, while at 250, the biggest/ max aperture is 5.6.

if you are at 55, you can still set the aperture to...say 8, that mean you will have a smaller aperture.

 

[Adrian Teo]

it means that at 55, the biggest/ max aperture is 4, while at 250, the biggest/ max aperture is 5.6.

if you are at 55, you can still set the aperture to...say 8, that mean you will have a smaller aperture.

Thanks. So if at 55 I set the camera aperture to 8, the actual aperture (camera plus lens) will be 4 (because the max aperture for the lens is 4)?

What if at 55 I set the camera aperture to 2, will the actual aperture (camera plus lens) be 2?

 

[FrancisGabriel]

Thanks. So if at 55 I set the camera aperture to 8, the actual aperture (camera plus lens) will be 4 (because the max aperture for the lens is 4)?

What if at 55 I set the camera aperture to 2, will the actual aperture (camera plus lens) be 2?

huh?? if you set it to 8 at 55, then the aperture will be 8...

since the biggest/ max aperture is 4, you wont be able to go to 2. It will not show 2 on your camera no matter how you roll the scroll...

http://en.wikipedia.org/wiki/Aperture

 

[Rashkae]

Thanks. So if at 55 I set the camera aperture to 8, the actual aperture (camera plus lens) will be 4 (because the max aperture for the lens is 4)?

What if at 55 I set the camera aperture to 2, will the actual aperture (camera plus lens) be 2?

Have you read your manual, or tried to google "aperture"?

 

[Adrian Teo]

huh?? if you set it to 8 at 55, then the aperture will be 8...

since the biggest/ max aperture is 4, you wont be able to go to 2. It will not show 2 on your camera no matter how you roll the scroll...

http://en.wikipedia.org/wiki/Aperture

OK thanks, the camera will automatically set the max aperture based on the lens I am using.

 

[Adrian Teo]

huh?? if you set it to 8 at 55, then the aperture will be 8...

since the biggest/ max aperture is 4, you wont be able to go to 2. It will not show 2 on your camera no matter how you roll the scroll...

http://en.wikipedia.org/wiki/Aperture

Have you read your manual, or tried to google "aperture"?

Yup thanks. Francis kindly answered my question already.

I just keep forgetting that the bigger the f number the smaller the aperture and vice versa