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May 4th, 2006, 02:21 PM
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#1 |
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Regular Crew
Join Date: Sep 2005
Location: Norway
Posts: 123
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Manual exposure
In manual mode the iris can be closed to F9.5 The next stop is close.
In bright conditions 9.5 is not enough to retain say 1/50 shutter. Now, in auto mode, when I press the exp.lock button I see iris levels all the way down to F22. How come I can't do this manually? |
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May 4th, 2006, 02:38 PM
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#2 |
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Major Player
Join Date: Nov 2001
Location: Basel area, Switzerland
Posts: 285
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Per, I cannot give you a straight answer to your question. However, you'd want to avoid closing the iris much further than f/9.5 due to diffraction effects anyway. Instead, use ND-filters - if necessary an additional one to the one built into the stock lens. Here's an interesting article on iris-induced diffraction effects:
http://www.luminous-landscape.com/tu...fraction.shtml Incidentally, I've been thinking about buying a variable ND-filter. Although expensive, such a filter would enable me to shoot at the aperture/shutter speed of choice most of the time, independent of lighting conditions. Does anyone have experience with variable NDs? HTH, Ron |
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