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#1 |
Major Player
Join Date: Oct 2004
Location: NYC
Posts: 260
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minimum aperture 9.5?
according to the canon specs minimum aperture is f16 - but the actual minimum is 9.5
why would canon do this? anyone tried using shutter speeds higher than 1/60 - with normal action in front of the lens (weddings) how fast a shutter speed can you use before it is noticeable? |
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#2 |
Major Player
Join Date: Jun 2004
Location: McLean, VA United States
Posts: 749
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The sensors on the XL-H1 chip are spaced so close together that the width of the Airy pattern (the spread pattern for a true point source) is comparable to the spacing at apertures in the f/5.6 - f/8 region. Canon thus limits the aperture of the lens on the XL-H1 so that it can't be operated in the "diffraction limited" region. If the lens is fitted to a SD camera with the same size chip the sensors are farther apart and the lens can be stopped down further without the lens's diffraction being the limiting effect (sensor spacing on the chip is the limiting effect in such a case).
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#3 |
Major Player
Join Date: Dec 2005
Location: Monterey, California
Posts: 895
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Also, the lenses available for 1/3" cameras don't do well when stopped down too far.. I use the 20x and the 16x and NEVER shoot closed down more than f4.
I just finished a medium high-end corporate (I don't usually like to do them, but they pay the bills - nearly a years worth in this case) and shot the entire show at 1.6 - 2, even though I had a full crew and HMIs.. I used the 16x lens - because I wanted shallow depth-of-field and needed the follow-focus - and it looks terrific - very happy client. If you are shooting in bright situations, use NDs or a polarizer. focusing is more critical, but the result is superior... |
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#4 |
Regular Crew
Join Date: May 2004
Location: tampa fl
Posts: 92
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Is there a jpeg of what this looks like?
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#5 | |
Inner Circle
Join Date: Apr 2003
Location: Aus
Posts: 3,884
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Quote:
As for not doing so well, I would have to disagree with you there. |
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#6 |
Regular Crew
Join Date: May 2004
Location: tampa fl
Posts: 92
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I really thought the sweet spot on all lenses was F8.....including slr's which I shoot the other 50% of my time....
This censor stuff is a trip...kinda above my head.... |
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