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kgiszewski
Joined: 25 Jul 2008
Posts: 283
Location: http://giszewski.com/
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Posted: Fri Aug 08, 2008 2:53 pm
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What does saying "use a fast lens" mean???
(Circle One)
A) A more expensive lens
B) Fast shutter speed
C) Other |
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hospitalera
Joined: 20 Dec 2005
Posts: 2349
Location: http://photographicfreedom.co.uk/forum
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Posted: Fri Aug 08, 2008 3:30 pm
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c)
Try again ;-) SY |
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hhltdave5
Joined: 20 Jun 2006
Posts: 6772
Location: Fox Lake, Illinois, USA
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Posted: Fri Aug 08, 2008 4:35 pm
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Here's a hint...Think of a small number you find on a lens. |
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hospitalera
Joined: 20 Dec 2005
Posts: 2349
Location: http://photographicfreedom.co.uk/forum
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Posted: Fri Aug 08, 2008 5:00 pm
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| hhltdave5 wrote: | | Here's a hint...Think of a small number you find on a lens. |
We are getting him there Dave ;-) Next hint: WHAT influences the possible shutter speed? SY |
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hhltdave5
Joined: 20 Jun 2006
Posts: 6772
Location: Fox Lake, Illinois, USA
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Posted: Fri Aug 08, 2008 5:17 pm
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Yup I'm sure he will have the answer now. |
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triceratops
Joined: 15 Nov 2006
Posts: 2271
Location: The other Nevada
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Posted: Fri Aug 08, 2008 8:12 pm
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Now think:
All the above! |
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jeffbanke
Joined: 18 Dec 2005
Posts: 4285
Location: right here for now!
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Posted: Fri Aug 08, 2008 9:15 pm
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OK mon ami's that was nicely obtuse! :)
OP, the smaller the f number, I.E. f 2.8 means it is a faster laens than a f3.5-4.5-5.6 etc.
A really fast lens is of the order of 1.2 or 1.4.
What it amounts to is the glass is is Bigger and lets more light transmit through it that the higher numbered lenses.
This is why NIKON make a $2000 lens which is 70mm-200mm f2.8 VR, and a 70mm-300mm f3.5-5.6 VR lens for $1000. You get what you pay for, the former is an exceptional piece of glass and electronics, the latter is, well something less! Nikon have three grades of lenses, so buyer beware. |
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kgiszewski
Joined: 25 Jul 2008
Posts: 283
Location: http://giszewski.com/
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Posted: Sat Aug 09, 2008 6:09 am
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haha, thank you all. I was afraid I was gonna have to tell Regis that I wanted to phone a friend for the answer ;)
*sounds of pencil on my list of photography jargon* |
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jeffbanke
Joined: 18 Dec 2005
Posts: 4285
Location: right here for now!
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Posted: Sun Aug 10, 2008 4:09 pm
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| kgiszewski wrote: | haha, thank you all. I was afraid I was gonna have to tell Regis that I wanted to phone a friend for the answer ;)
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You already did! |
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davidcrehner
Joined: 20 Jul 2005
Posts: 3177
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Posted: Sun Aug 10, 2008 10:18 pm
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I always that it was dumb to call it a "fast" lens.
Really it makes more sense to call it a "bright" lens. |
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jeffbanke
Joined: 18 Dec 2005
Posts: 4285
Location: right here for now!
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Posted: Sun Aug 10, 2008 10:40 pm
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| davidcrehner wrote: | I always that it was dumb to call it a "fast" lens.
Really it makes more sense to call it a "bright" lens. |
Except "bright" implies that it is a source of illumination or has high reflectance!
But I take your point there is possibly a better term that is easier to understand exactly what it's significance is, and that would be "transmission coefficient". |
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davidcrehner
Joined: 20 Jul 2005
Posts: 3177
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Posted: Mon Aug 11, 2008 7:00 am
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| jeffbanke wrote: | | davidcrehner wrote: | I always that it was dumb to call it a "fast" lens.
Really it makes more sense to call it a "bright" lens. |
Except "bright" implies that it is a source of illumination or has high reflectance!
But I take your point there is possibly a better term that is easier to understand exactly what it's significance is, and that would be "transmission coefficient". |
It's brighter because it lets in more light. Makes sense to me. |
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jeffbanke
Joined: 18 Dec 2005
Posts: 4285
Location: right here for now!
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Posted: Mon Aug 11, 2008 3:12 pm
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| davidcrehner wrote: | | jeffbanke wrote: | | davidcrehner wrote: | I always that it was dumb to call it a "fast" lens.
Really it makes more sense to call it a "bright" lens. |
Except "bright" implies that it is a source of illumination or has high reflectance!
But I take your point there is possibly a better term that is easier to understand exactly what it's significance is, and that would be "transmission coefficient". |
It's brighter because it lets in more light. Makes sense to me. |
If it works for you my freind that is all that matters!
Dictionary meaning of "bright" :
1. Emitting or reflecting much light: full of light; shining.
2. Of brilliant color; vivid
3. Glorious; illustrious
4. Having or showing high intelligence; quick witted.
5. Lively; vivacious
6. Hopeful; auspicious
So I would have thought for non English speaking peoples the incorrect usage of an English word would confuse the heck out of them, since there are already so many correct meanings of the word.
But like I said whatever works for you, works for you! :) |
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