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07/21/2004 01:05:12 AM · #1 |
What's the fastest/most open aperture anyone has ever seen on an SLR lens?
Is it the Canon EF 85mm f/1.2??? |
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07/21/2004 01:10:48 AM · #2 |
There is/was a 50mm f1.0L USM
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07/21/2004 01:11:10 AM · #3 |
Originally posted by Gordon:
There is/was a 50mm f1.0L USM |
HOLY COW! Prove it! |
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07/21/2004 01:15:00 AM · #4 |
Originally posted by wimbello:
Originally posted by Gordon:
There is/was a 50mm f1.0L USM |
HOLY COW! Prove it! |
huh ? You can find plenty of google links if you don't believe me.
Message edited by author 2004-07-21 01:15:18.
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07/21/2004 01:18:01 AM · #5 |
fred miranda has the review in the review section i think.. fredmiranda.com
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07/21/2004 01:32:14 AM · #6 |
I'm curious, is f/1.0 the amount of light your eye can see?
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07/21/2004 01:44:48 AM · #7 |
Originally posted by jadin:
I'm curious, is f/1.0 the amount of light your eye can see? |
The f stop is just the focal length, divided by the actual diameter of the aperture. This is mainly the reason that most fast lenses are quite short focal length - making a sharp image through a 50mm opening is quite a challenge, never mind say a 600mm opening for a hypothetical 600mm F1.0.
As far as I am aware there is nothing special about f1.0 that makes it a base point or anything, it is just when the focal length to aperture ratio is 1:1
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07/21/2004 03:53:11 AM · #8 |
Zeiss made a 50mm f0.7 lens which Kubrick later used for the filming of Barry Lyndon. info link
A list of other super-fast lenses.
Visit Bjørn Rørslett's page(s) for other lenses and sample images.
A really informative and lengthy page on fast lenses (which makes mention of a 240mm f1.2 6x7 lens.
Check out this fat, 15lb 180mm f1.3 lens (check out those MTF charts). You can see a picture of this lens mounted on a Nikon 35mm SLR.
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07/21/2004 05:41:39 AM · #9 |
Originally posted by dwoolridge:
Zeiss made a 50mm f0.7 lens which Kubrick later used for the filming of Barry Lyndon. info link
A list of other super-fast lenses.
Visit Bjørn Rørslett's page(s) for other lenses and sample images.
Excellent reading thank you for sharing.
A really informative and lengthy page on fast lenses (which makes mention of a 240mm f1.2 6x7 lens.
Check out this fat, 15lb 180mm f1.3 lens (check out those MTF charts). You can see a picture of this lens mounted on a Nikon 35mm SLR. |
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07/21/2004 02:51:06 PM · #10 |
Originally posted by jadin:
I'm curious, is f/1.0 the amount of light your eye can see? |
So you got me thinking and from a bit of poking around in some text books,
For the general case, (not looking at things close up)
The human eye focal length is around 17mm (though I found estimates up to about 28mm) and the max aperture (diameter of the pupil fully open) is about 7mm This gives an effective f-stop of 2.4
Minimum diamter is around 1.5mm to 2mm, giving a max stopped down f stop of around f11 to f8.5
I'm waiting on Canon coming out with the 17mm F1L upgrade...
Message edited by author 2004-07-21 14:55:09.
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07/21/2004 03:55:58 PM · #11 |
Really fast lenses must be more common for video, probably because the target area is so small.
The fastest lens I own is 50mm, f/0.95. with a "C" mount for video. There are high quality galilean converters that can extend the focal length and improve the focal ratio.
For example, a 2X expander with a 125 mm clear aperture placed in front of a 50mm f/2.0 would yield 100mm efl at f/0.80. Hewlett-Packard made some of these for use as beam expanders for lasers.
I have used the one I own (acquired government surplus) to improve the low light capability of my camcorder. Recorded some great footage of Hale-Bopp!
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07/21/2004 04:12:23 PM · #12 |
Originally posted by Gordon:
I'm waiting on Canon coming out with the 17mm F1L upgrade... |
better make sure it has USM. that whirring noise would get really irritating after a while :) |
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