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Fast Lens; What is fast lens?
Topic Started: Feb 29 2008, 02:26 PM (2,377 Views)
jasahchun
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路人甲
alpha-ming9866
Feb 29 2008, 11:21 PM
Some lens with f4 can be faster than f2.8 ... Example the Beercan , i think it had something to do with the built , the body ... There are motorized Minolta XI lenses but think not so fast also ... :o

ohhhhh.. ya quite true..

but but.. if at the same range.. f4 compare with f2.8.. f2.8 will be definitely faster right?
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Ming
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90609866
Not like this say . You can compare a 100mm f2.8 & the Beercan at 100mm f4 , Beercan already focused & ready to shoot while the 100mm may be still hunting ...

KM 28-70mm f2.8 vs the Minolta 28-70mm f2.8 , this KM is faster too . :huh:
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jasahchun
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alpha-ming9866
Feb 29 2008, 11:31 PM
Not like this say . You can compare a 100mm f2.8 & the Beercan at 100mm f4 , Beercan already focused & ready to shoot while the 100mm may be still hunting ...

KM 28-70mm f2.8 vs the Minolta 28-70mm f2.8 , this KM is faster too . :huh:

but bro clkoh say that Macro lenses are slower.. so it's hard to compare in that way..

so cannot judge whether it's a fast lens or not just by looking at the maximum aperture.. there are other elements involved too.. ;)
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Ming
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90609866
Thats it , have to see which lens , which made , then can compare to see how is the FAST ma . B)
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jasahchun
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alpha-ming9866
Feb 29 2008, 11:42 PM
Thats it , have to see which lens , which made , then can compare to see how is the FAST ma . B)

hehe i really learn a lot in this thread man.. but hope don't confuse bro yannh.. :lol:
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tankm
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jasahchun
Mar 1 2008, 12:25 AM
hehe i really learn a lot in this thread man.. but hope don't confuse bro yannh.. :lol:

ok. exam time. In photography generally, what is a "fast lens" ? :sweat:
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yannh
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tankm
Mar 1 2008, 08:06 AM
ok. exam time. In photography generally, what is a "fast lens" ? :sweat:

Hey guys,
I'm not confuse and learning something new here yesterday. But some of you seems still confuse leh...
:rolleyes:
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ChaoxAngel
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It's a gray area as to where a fast lens begins...

Those that have large apertures but slower AF speeds like large aperture f2.8 macro lenses (due to gearing) or sub f2.8 primes (in general some sub 2.8 primes do focus quickly). Large aperture lens without fast focusing wouldn't be too useful for tracking and shooting in difficult lighting conditions.

and,

Those that are smaller aperture but has fast focusing speeds like the 70-300mm f4.5-5.6 G SSM can actually still be considered fast lenses due to their ability to focus quickly. A fast focusing, smaller aperture lens would be harder pressed in terms of Shutter speeds and more grain with higher ISO.

Well, in my opinion, a truly fast lens should combine a large aperture with speedy focusing.

The 24-70mm f2.8 CZ SSM and 70-200 f2.8 G SSM are fast lenses as they have both have large apertures mated with speedy focusing speeds.

Trying to have both will of course, break your pocket.

In the end, It's up to you to to find out what kind of "fast" lens you want to go for.
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Ming
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90609866
Frankly , Fast & Bright are very difficult for me to understand .

35mm f.4 G = Fast & Bright ?
85mm f1.4 = Fast & Bright ?
135m f1.8 = Fast & Bright ?

f2.8 = Bright not Fast ?
f2.8 G = Bright not Fast ?
f2.8 SSM = Bright & Fast ?

:wacko: :blink: :o
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yk200
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but in the end of the day, do u need so fast lens?? :sweat:
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