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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Fri Dec 17, 2010 4:32 pm Post subject: Fast lenses |
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Attila wrote:
http://www.mflenses.com/gallery/fast-lenses _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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martinsmith99
Joined: 31 Aug 2008 Posts: 6950 Location: S Glos, UK
Expire: 2013-11-18
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Posted: Fri Dec 17, 2010 5:19 pm Post subject: |
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martinsmith99 wrote:
At what point does a lens become fast? I always think that this depends on FL. _________________ Casual attendance these days |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Fri Dec 17, 2010 5:22 pm Post subject: |
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Attila wrote:
martinsmith99 wrote: |
At what point does a lens become fast? I always think that this depends on FL. |
Faster than usual in it's focal lengths.
for example in 135mm F2 and below, in 50mm below 1.4 etc _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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RioRico
Joined: 12 Mar 2010 Posts: 1120 Location: California or Guatemala or somewhere
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Posted: Fri Dec 17, 2010 6:57 pm Post subject: |
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RioRico wrote:
Attila wrote: |
martinsmith99 wrote: |
At what point does a lens become fast? I always think that this depends on FL. |
Faster than usual in it's focal lengths.
for example in 135mm F2 and below, in 50mm below 1.4 etc |
Then we must decide what is 'usual' in any focal length. To me, the usual is f/2.8 in 24-28-35-90-100-135mm, f/2 at 50-55-58mm, f/4 at 15-20-200mm. Then, 'fast' is 1/2 or 1 stop faster than usual, and 'super-fast' is beyond that. That is my personal mental map.
But like any line-drawing, these lines are arbitrary, and shift with changes in lensmaking. We may be near absolute limits in commercial optics. But lens matrices and arrays, active controls of malleable shapes, extensive image processing, may change our standards of judging optics and speed. _________________ Too many film+digi cams+lenses, oh my -- Pentax K20D, K-1000, M42s, more
The simple truth is this: There are no neutral photographs. --F-Stop Fitzgerald |
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trev
Joined: 30 Jun 2010 Posts: 580 Location: North Wales - UK
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Posted: Fri Dec 17, 2010 7:51 pm Post subject: |
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trev wrote:
Ah, but what happens when discussing older lenses when the usual was f3.5 or more???????
So f1.8 was superfast back then eh?? _________________ Fuji X10, X-A1 and Samsung nx 20 |
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Arninetyes
Joined: 24 Jun 2010 Posts: 312 Location: SoCal
Expire: 2013-03-26
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Posted: Fri Dec 17, 2010 9:49 pm Post subject: |
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Arninetyes wrote:
It was....and still is, based on percentage of available lenses. _________________ The longer I use autofocus lenses,
The greater my preference for manual focus grows. |
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cooltouch
Joined: 15 Jan 2009 Posts: 9096 Location: Houston, Texas
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Posted: Sat Dec 18, 2010 12:25 am Post subject: |
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cooltouch wrote:
This seems to me to be a rather subjective call and format dependent. _________________ Michael
My Gear List: http://michaelmcbroom.com/photo/gear.html
My Gallery: http://michaelmcbroom.com/gallery3/index.php/
My Flickr Page: https://www.flickr.com/photos/11308754@N08/albums
My Music: https://soundcloud.com/michaelmcbroom/albums
My Blog: http://michaelmcbroom.com/blogistan/ |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Sat Dec 18, 2010 12:40 am Post subject: |
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Attila wrote:
cooltouch wrote: |
This seems to me to be a rather subjective call and format dependent. |
+1 _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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jjphoto
Joined: 17 Mar 2009 Posts: 410
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Posted: Sat Dec 18, 2010 12:48 am Post subject: |
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jjphoto wrote:
Attila wrote: |
cooltouch wrote: |
This seems to me to be a rather subjective call and format dependent. |
+1 |
+2
For example (but there are many) 300/4.5 is fast for an 8x10 lens, slow for 35mm.
JJ |
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IAZA
Joined: 16 Apr 2010 Posts: 2587 Location: Indonesia
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Posted: Sat Dec 18, 2010 2:01 am Post subject: |
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IAZA wrote:
Attila wrote: |
martinsmith99 wrote: |
At what point does a lens become fast? I always think that this depends on FL. |
Faster than usual in it's focal lengths.
for example in 135mm F2 and below, in 50mm below 1.4 etc |
Usually thats right. But not always right.
Based on my test, 50/1.4 only very slight slower than 50/1.2 lens. I mean smc M 50/1.4 vs Nikkor 55/1.2 & FD 55/1.2 SSC
My camera metering same speed with those 3 lenses. _________________ nex5, Olympus EPM1, yashica half 14, Canon eos 650 want to see samples of mine? please click My lenses
and My gallery
~Suat~ |
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trev
Joined: 30 Jun 2010 Posts: 580 Location: North Wales - UK
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Posted: Sat Dec 18, 2010 10:32 am Post subject: |
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trev wrote:
Quite agree with the last post...........I have canon fd 50 1.4 and 1.8 lenses and theres bugger all difference between them regarding light gathering properties........half a stop difference barely registers in camera _________________ Fuji X10, X-A1 and Samsung nx 20 |
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Arninetyes
Joined: 24 Jun 2010 Posts: 312 Location: SoCal
Expire: 2013-03-26
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Posted: Sat Dec 18, 2010 5:12 pm Post subject: |
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Arninetyes wrote:
There are differences. Many meters may not notice a mere 2/3 of a stop, but film/sensors do. _________________ The longer I use autofocus lenses,
The greater my preference for manual focus grows. |
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Seele
Joined: 17 Apr 2009 Posts: 742 Location: Sydney Australia
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Posted: Sat Dec 18, 2010 5:41 pm Post subject: |
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Seele wrote:
jjphoto wrote: |
Attila wrote: |
cooltouch wrote: |
This seems to me to be a rather subjective call and format dependent. |
+1 |
+2
For example (but there are many) 300/4.5 is fast for an 8x10 lens, slow for 35mm.
JJ |
However, for those using smalelr formats, such as 35mm, most would have no problem using their lenses at full bore, but large format users would not want to do that. In fact Rodenstock specified their lenses to be used at f/22.
That being said, while I have no problem at all using my Protar V lenses, I still use a Grandagon-N, 65/4.5 |
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kopimorning
Joined: 23 May 2010 Posts: 97 Location: Jakarta-Bali
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Posted: Sun Dec 19, 2010 3:21 pm Post subject: |
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kopimorning wrote:
I still wondering why lenses with large aperture called fast lens
It only lets more light passing through. The speed of light is constant exept if you are shooting near a blackhole _________________ http://www.flickr.com/photos/41597826@N04 |
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DSG
Joined: 04 Mar 2007 Posts: 544 Location: London, UK.
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Posted: Sun Dec 19, 2010 4:15 pm Post subject: |
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DSG wrote:
kopimorning wrote: |
I still wondering why lenses with large aperture called fast lens
It only lets more light passing through. The speed of light is constant exept if you are shooting near a blackhole |
It refers to the shutter speeds the lens allows...A fast lens allows faster shutter speeds to be used due to its wider/brighter aperture and a slow lens has to be used at slower shutter speeds because of it smaller/dimmer aperture...At least thats the story I'm sticking to |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Sun Dec 19, 2010 4:17 pm Post subject: |
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Attila wrote:
DSG wrote: |
kopimorning wrote: |
I still wondering why lenses with large aperture called fast lens
It only lets more light passing through. The speed of light is constant exept if you are shooting near a blackhole |
It refers to the shutter speeds the lens allows...A fast lens allows faster shutter speeds to be used due to its wider/brighter aperture and a slow lens has to be used at slower shutter speeds because of it smaller/dimmer aperture...At least thats the story I'm sticking to |
I like this explantion thanks! In Hungarian we call them lens with light power. _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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RioRico
Joined: 12 Mar 2010 Posts: 1120 Location: California or Guatemala or somewhere
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Posted: Sun Dec 19, 2010 6:10 pm Post subject: |
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RioRico wrote:
DSG wrote: |
kopimorning wrote: |
I still wondering why lenses with large aperture called fast lens
It only lets more light passing through. The speed of light is constant exept if you are shooting near a blackhole |
It refers to the shutter speeds the lens allows...A fast lens allows faster shutter speeds to be used due to its wider/brighter aperture and a slow lens has to be used at slower shutter speeds because of it smaller/dimmer aperture...At least thats the story I'm sticking to |
It goes back to Aristotelean physics, where heavier objects fall faster than do lighter objects. So-called 'faster' lenses are usually bigger and heavier than 'slower' lenses; being heavier, they fall faster. Galileo proved this to be false when he dropped cannonballs and apples from the Tower of Pisa, but optical engineers still live in a pre-Galilean, pre-Newtonian world. Selah! _________________ Too many film+digi cams+lenses, oh my -- Pentax K20D, K-1000, M42s, more
The simple truth is this: There are no neutral photographs. --F-Stop Fitzgerald |
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cooltouch
Joined: 15 Jan 2009 Posts: 9096 Location: Houston, Texas
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Posted: Sun Dec 19, 2010 6:14 pm Post subject: |
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cooltouch wrote:
DSG's explanation sounds as good as any. RioRico's violates the principle of parsimony.
I've always thought of the speed, whether fast or slow, as being the amount of time it takes to make an exposure at that particular aperture. Fast lenses allow fast exposure times, which amounts to the same thing as DSG's explanation in the end. _________________ Michael
My Gear List: http://michaelmcbroom.com/photo/gear.html
My Gallery: http://michaelmcbroom.com/gallery3/index.php/
My Flickr Page: https://www.flickr.com/photos/11308754@N08/albums
My Music: https://soundcloud.com/michaelmcbroom/albums
My Blog: http://michaelmcbroom.com/blogistan/ |
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kopimorning
Joined: 23 May 2010 Posts: 97 Location: Jakarta-Bali
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Posted: Mon Dec 20, 2010 5:56 am Post subject: |
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kopimorning wrote:
cooltouch wrote: |
I've always thought of the speed, whether fast or slow, as being the amount of time it takes to make an exposure at that particular aperture. Fast lenses allow fast exposure times, which amounts to the same thing as DSG's explanation in the end. |
I like your explanation, that make your explanation sounds as good as any
Now I would like to call these lenses as: "fast shutter speed allowed lens" _________________ http://www.flickr.com/photos/41597826@N04 |
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Scheimpflug
Joined: 06 Feb 2010 Posts: 1888 Location: New Zealand / USA
Expire: 2011-11-18
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Posted: Mon Dec 20, 2010 8:18 am Post subject: |
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Scheimpflug wrote:
I always thought "fast" lenses were the ones that emptied your wallet quickly? _________________ Sigma DP1, Nikon D40 (hers ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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Bruce
Joined: 15 Jan 2008 Posts: 842 Location: Boston, Ma USA
Expire: 2014-11-22
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Posted: Mon Dec 20, 2010 5:08 pm Post subject: |
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Bruce wrote:
Scheimpflug wrote: |
I always thought "fast" lenses were the ones that emptied your wallet quickly? |
I like your explanation, the fast lens is the one that allows a lot of light in your pocket! _________________ Digital: Canon 40d & 5DmkII, Film: Hasselblad 203fe/Zeiss 80/2.8 cfe
Adapters for EOS: Cy; M42; Zenit39; Exakta; LeicaR; OlympusOM; PK; Nikon; Rollei35; Retina; Adaptal; P-6 |
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