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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 24 Aug 2011 (Wednesday) 12:15
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what are the limiting factors of producing a quick lens?

 
LFFL
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Aug 24, 2011 12:15 |  #1

I've always wondered why zoom lenses were limited to f/2.8
Why not a 70-200 f/1.2
with the exception of money, is there any other limiting factor(s)?


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Echo63
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Aug 24, 2011 12:41 |  #2

The laws of physics !

The aperture size in a lens is a ratio of the size of the aperture opening vs the focal length of the lens.
While it might be possible to produce a 200mm f1.2 it would probably be as big as a 400mm f2.8, and cost about the same (and before you ask where the problem is, I ask you to rent a 400 and carry it round for a day, it sounds cool, but the 300 f2.8 and up are big heavy lenses - you don't carry them around for fun)


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jrbdmb
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Aug 24, 2011 14:04 |  #3

Plus zooms tend to be larger than a prime lens with the same focal length. So take the 400mm f/2.8 and add a bit to it. Not sure I'd want to carry that around all day.  :o


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Xcelx
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Aug 24, 2011 14:08 |  #4

It also depends on sensor size, sure there are faster zoom lenses than 2.8 but not for EF. For instance a Canon Digisuper 86 II TV camera, with a 9.3mm-800mm f/1.7-4 lens, amongst many other lens options.




  
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gabebalazs
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Aug 24, 2011 14:24 |  #5

Xcelx wrote in post #12992148 (external link)
It also depends on sensor size, sure there are faster zoom lenses than 2.8 but not for EF. For instance a Canon Digisuper 86 II TV camera, with a 9.3mm-800mm f/1.7-4 lens, amongst many other lens options.

Exactly. I have an old Canon XL1 MiniDV camera sitting next to me with a white 5.5-88 IS II f1.6-2.6 (that's roughly about 39-624mm equivalent) lens on it. Now this is a great lens, super fast. How can it do that? The sensor is about a tenth of the size of even an APS-C sensor.
I can't even imagine what size and weight this lens would be if it had to provide an image circle enough for a DSLR sensor... :rolleyes:


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Aug 24, 2011 15:23 |  #6

Lens designers haven't discovered yet a quality zoom DSLR design faster than f/2.8. It is not even clear yet if such designs can be discovered. This is work in progress...


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Aug 24, 2011 15:26 |  #7

I'm not sure but there may be an Olympus zoom that is faster than 2.8. Smaller sensor though.


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Aug 24, 2011 16:15 |  #8

They may develop faster zooms for EVIL (non-DSLR) cameras, as the flange to sensor distance there is much shorter, which makes the design of faster lenses somewhat easier.


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bpark42
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Aug 24, 2011 16:22 |  #9

gabebalazs wrote in post #12992590 (external link)
I'm not sure but there may be an Olympus zoom that is faster than 2.8. Smaller sensor though.

Correct. There are a couple Olympus f2 zooms for 4/3 dslr's.

e.g. 35-100 f2, 14-35 f2




  
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cfvisuals
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Aug 24, 2011 17:30 as a reply to  @ bpark42's post |  #10

I would say LAW OF DEMAND/SUPPLY prohibits it instead of LAW OF PHYSICS.

I am quite sure they have the technology to do it, but not in the most economic way. They have no incentive to manufacture lenses that no one would buy / could afford.
It's cheaper for Canon to develop higher ISO capacity than making bigger aperture on lenses. And more people could afford it and buy it.

It's like videos in RAW files. I heard about it on CanonRumor that 5D mark 3 is going to introduce video RAW files. That's somewhat unrealistic for today's CF card memory size. It's going to be way too large to fit in any standard CF card, maybe 10~20 sec long would fit.


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Aug 24, 2011 18:06 |  #11

LFFL wrote in post #12991415 (external link)
I've always wondered why zoom lenses were limited to f/2.8 - Why not a 70-200 f/1.2 - with the exception of money, is there any other limiting factor(s)?

As mentioned several times in this forum: Canon makes faster zoom lenses for high-definition video cameras. They cost at least US $100,000. The imaging circle for HD TV is smaller than for a DSLR, so the DSLR version would be larger, heavier and more expensive. Are you willing to pay US $300,000 for a lens?




  
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what are the limiting factors of producing a quick lens?
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