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Fast Lens; What is fast lens?
Topic Started: Feb 29 2008, 02:26 PM (2,378 Views)
Ming
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90609866
Fast or Slow , i am still loving my Gs . But still drooling for the new CZ series la ... :bava:

OT here a bit , cannot find any better thread to 'tompang' ... My CZ16-80 is back from SSC and its a totally different lens now ! WOW !!! The SSC told me no need to file lawsuit against that QC who 'signed' the cert ...

Just :knock: him here will do . :lol:

CZ16-80 . :thumbsup:
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Tomato
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clkoh
Feb 29 2008, 04:20 PM
Hart, you mean smaller F numbers? Otherwise should be wider aperture. :D

Generally there are 2 things here for fast lens - High shutter speed (Wide aperture) and Fast AF.

Ming, 28-70G is known for it's slow AF. It's actually a wonderful lens for sharpness, colour and bokeh.

duh.. yes...

hart
Qualified Master Photographer | Certified Premier Greener Photography
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cjng
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Emeritus Alphadslr Official Passerby~shooting badly since 2004 and continuing

alpha-ming9866
Feb 29 2008, 04:31 PM
Fast or Slow , i am still loving my Gs . But still drooling for the new CZ series la ... :bava:

OT here a bit , cannot find any better thread to 'tompang' ... My CZ16-80 is back from SSC and its a totally different lens now ! WOW !!! The SSC told me no need to file lawsuit against that QC who 'signed' the cert ...

Just :knock: him here will do . :lol:

CZ16-80 . :thumbsup:

how abt bro triggerhappy?
Haven't heard anything from him since :unsure:
My Fotogallery

Hello CZ! bye bye G!
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Ming
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90609866
He got back his CZ and seems to be pleased ... How is yours Bro Trigger ? :unsure:
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yannh
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agetan
Feb 29 2008, 04:04 PM
fast lens is more associated with aperture, smaller aperture means you can use faster shutter speed hence it is faster in terms of shutter speed. hope this clear out the doubt.

50mm f1.7 is consider normal, but 50mm f1.4 is consider fast
70-210 f4 is consider normal, but 70-200 f2.8 is consider fast
600mm f8 is consider slow, but 600mm f4 is consider fast lens.
like wise 35mm f2.8 is consider normal but 35mm f1.4 is consider fast lens.

It is relative, it is not how fast the lens focus or the focus motor speed which make a lens fast lens.

Regards,

Hart

I see, so "fast" is refering to ability to have fast shutter.
All the while I thought it's the focusing speed.
Thanks a lot.

Further confirm this on http://en.wikipedia.org/wiki/Lens_speed
Sony Alpha.
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yannh
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alpha-ming9866
Feb 29 2008, 04:31 PM
Fast or Slow , i am still loving my Gs . But still drooling for the new CZ series la ... :bava:

OT here a bit , cannot find any better thread to 'tompang' ... My CZ16-80 is back from SSC and its a totally different lens now ! WOW !!! The SSC told me no need to file lawsuit against that QC who 'signed' the cert ...

Just :knock: him here will do . :lol:

CZ16-80 . :thumbsup:

Ming, any idea what was the problem of your CZ?
Sony Alpha.
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Trigger Happy
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alpha-ming9866
Feb 29 2008, 04:47 PM
He got back his CZ and seems to be pleased ... How is yours Bro Trigger ? :unsure:

so far so good, i think. looks acceptable at 5.1x zoom on the cam, haven't downloaded the test pics yet so i can't confirm 100%.

in any case its a HUGE improvement.


fast lens? any lens is a fast lens.
use MF.

:sofunny:
----------------------------------
Many are culled, few are chosen
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Ming
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90609866
yannh
Feb 29 2008, 04:59 PM
alpha-ming9866
Feb 29 2008, 04:31 PM
Fast or Slow , i am still loving my Gs . But still drooling for the new CZ series la ... :bava:

OT here a bit , cannot find any better thread to 'tompang' ... My CZ16-80 is back from SSC and its a totally different lens now ! WOW !!! The SSC told me no need to file lawsuit against that QC who 'signed' the cert ...

Just  :knock:  him here will do .  :lol:

CZ16-80 .  :thumbsup:

Ming, any idea what was the problem of your CZ?

My CZ16-80mm <_< ... At first when bought , i thought its soft & off focus , back focus at any zoom from 16mm to end , which is the problem caused by my A700 . Then after my A700 is back , good & steady , i realised this CZ16-80mm is getting worst & unaccepatble anymore , i decide to send it back to SSC . Then they say got problem ! 3 Days & its back to me Sharp & Clear as what many had said .

Now i am a more happier user of CZ lens ! :D
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jasahchun
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路人甲
wow!! i have learn a lot of things today.. but can i say fast lens.. is depending on the user's preference?

I should say f2.8 is faster than f3.5 but the speed is much depending on the user's preference.. ;)
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Ming
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90609866
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
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