Category Archives: Photography

Relative Light Index for photocameras

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I have developed a mathematical formula to compare the light sensitivity for photo camera lenses.

A twice as high value means that the lens will receive twice as much light. The formula and equation are linear.

The relative light index of a camera can be calculated as followed:

RLI = ( 1/lens mm ) * (F^2) * ISO value

This initial formula doesn`t correct for VR or OS (whatever name you prefer).
Therefore I adapted the formula to compensate for this

RLI = ( 1/lens mm ) * (F^2) * ISO value * VR (if not, 1  | if yes 2)

Because these values are very small (below 5) its recommended to multiply them with 1000 to create a  more easy to read value.

Bevrijdingsfestival Zeeland 2011

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5 mei, Vlissingen.

Onderstroom day 7

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I spend most of the day at the Urban Village stage (bellamypark).

I`ve seen Rondomtrom, MBO Dans (ROC Goes), The Nuclear Brothers and The Hickey Underworld.

Onderstroom day 6

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Yesterday it was street theater day.I shot nearly 200 pictures.

The grupo puja air show was canceled just minutes before start because of the rain.

Onderstroom day 5

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Yesterday was the second day of the festival (9-7) but the fifth for me.

I mostly did small jobs.

At 20.00 hours the festival started including Circus Ronaldo and the acts near the dock. Later that evening the dutch band the juke joints played an acoustic session on the dock stage. I`ve got pictures of the band.

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