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post #11 of 36
Er yes? I was referring to the AF acquisition speed, not of the lens itself on the 55-300.
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post #12 of 36
Quote:
Originally Posted by bfeng91 View Post
Er yes? I was referring to the AF acquisition speed, not of the lens itself on the 55-300.
What?
post #13 of 36
As in the time it takes to focus using AF when starting out of focus o.O
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post #14 of 36
That's not what "fast" and "slow" refer to.
post #15 of 36
Thread Starter 
I meant focusing speed when I said fast lens, sorry. Fast lens is one with large aperture too allow more light.

I always get confused with this. :s

Quote:
Originally Posted by sub50hz View Post
What?
He explained that he meant AF speed.
Edited by kga92 - 5/26/11 at 12:46pm
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post #16 of 36
Quote:
Originally Posted by kga92 View Post
He explained that he meant AF speed.
I can read -- but throwing around the terms fast and slow like that are bound to cause confusion between people who don't fully understand them, i.e. the current state of this thread.

A "fast" lens is a lens with a wide aperture (typically f/2.8 for zooms, f/2 or better for primes), while a "slow" lens would be a lens with a narrow max aperture at any given focal length.
post #17 of 36
Quote:
Originally Posted by sub50hz View Post
That's not what "fast" and "slow" refer to.
I know that when "fast" or "slow" are used to describe a lens it's referring to the max aperture of the lens. The 35 1.8 can be described as "faster" than the kit 18-55 3.5-5.6. However, I'm not referring to the lens itself - rather the motor within the lens for focusing speed.

Quote:
Originally Posted by kga92 View Post
I meant focusing speed when I said fast lens, sorry. Fast lens is one with large aperture too allow more light.

I always get confused with this. :s
Yes, that is what I meant as well.


Quote:
Originally Posted by sub50hz View Post
I can read -- but throwing around the terms fast and slow like that are bound to cause confusion between people who don't fully understand them, i.e. the current state of this thread.

A "fast" lens is a lens with a wide aperture (typically f/2.8 for zooms, f/2 or better for primes), while a "slow" lens would be a lens with a narrow max aperture at any given focal length.
Perhaps I phrased it wrong, but when I said the 55-300 AF was slow, I meant that the autofocus from the 55-300 was slow, not the lens itself. I see that I could have articulated it better.
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post #18 of 36
Thread Starter 
now I am considering the 70-300mm too. A bit expensive, but for a reson I guess, and the range of the lens on a DX body is impressive.
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post #19 of 36
Quote:
Originally Posted by kga92 View Post
now I am considering the 70-300mm too. A bit expensive, but for a reson I guess, and the range of the lens on a DX body is impressive.
Actually, the "range" is the same as 300mm on a full frame body, but your field of view is cropped by 1.5x.
post #20 of 36
Quote:
Originally Posted by sub50hz View Post
Actually, the "range" is the same as 300mm on a full frame body, but your field of view is cropped by 1.5x.
Wouldn't the "effective" range on an APS-C camera be 450mm as the crop factor is 1.5x?
Edited by bfeng91 - 5/26/11 at 1:13pm
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