Tuesday, September 2, 2008

Term 3 Session 5 Exposure Value, Rule of Thirds, Software, "Stop Motion" vs "Motion Blurred"

(UPDATE Aug 2012 - I have removed images that won't display correctly but will leave the text here as reference)
Exposure Value
In photography, exposure value (EV) denotes all combinations of camera shutter speed and relative aperture that give the same exposure.
Exposure Compensation is a feature of a camera that allows you to adjust the exposure measured by its light meter. Usually, the range of adjustment goes from +2 to -2 EV in 1/3 steps.
This means that you can adjust the exposure measured by the light meter by telling the camera to allow more light in (positive exposure compensation) or to allow less light in (negative exposure compensation).


Exposure Value examples ... For a full view click on each picture
    
3 Pictures .. Exposure Value +/- 0.0 ;  -1.0 ; +1.0
all taken at 1/125sec @ f8


This day was extremely overcast so the overexposed picture (dark one) still
does not have a lot of sky detail.

Rule of thirds

The rule of thirds is a compositional rule of thumb in photography and other visual arts such as painting and design.[1] The rule states that an image can be divided into nine equal parts by two equally-spaced horizontal lines and two equally-spaced vertical lines. The four points formed by the intersections of these lines can be used to align features in the photograph. Proponents of this technique claim that aligning a photograph with these points creates more tension, energy and interest in the photo than simply centering the feature would. http://en.wikipedia.org/wiki/Rule_of_thirds

 
This photograph of a sunset taken in the Thousand Islands region demonstrates the principles of the rule of thirds





 
 










Once again a cloudy overcast day .. but at least I was there!!!

1/80 @ f5.6 EV -1.67       1/8 @ f9.0 EV 0.0          1/2 @ f18 EV 0.0
Fast shutter speed, short exposure Slow shutter speed, long exposure
Fast shutter speed, short exposure         Slow shutter speed, long exposure

http://www.shortcourses.com/use/using2-3.html
Fantastic shot!
Motion in a scene can be frozen or blurred depending on the shutter speed and other factors. Blur can be used creatively to evoke a feeling of motion as in this shot of a waterfall in Yosemite National Park.



This program works quite well and is completely free ...
... if you like the way it works you could ... if you wanted to ... pay for the full version ...
... most people I know have not bothered and I've not heard of any problems ...
... this is the antivirus I use myself.

AVG Free
Wikipedia says:
"AVG is an umbrella term for a range of antivirus and internet security software for the Microsoft Windows, Linux, and FreeBSD computing platforms, developed by AVG Technologies.

According to AVG Technologies, over 70 million users have AVG Anti-Virus protection, including users of the Free Edition. On April 24, 2008, AVG released AVG Anti-Virus Free Edition 8.0. Along with a more colorful interface, the new program added some new features - a combined Anti-Virus and Anti-Spyware protection engine, LinkScanner Search-Shield safe search protection, plus the AVG Security Toolbar - which were previously only available in AVG commercial versions."

Basic antivirus and antispyware protection for Windows available to download for free. Limited features, no support, for private and non-commercial use only.
http://www.grisoft.com/ww.product-avg-anti-virus-free-edition
http://free.avg.com/ww.download?prd=afe
http://free.avg.com/ww.homepage

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