Tuesday, July 5, 2011

Exercise 7 your tolerance for noise

For this exercise , I have taken the flute from shenshen and laid it on a wooden plate mat away from the window  the weather is very over cast. So I am getting some nice low side lighting. I often look at the light falls on objects here.

Setting the camera up on a try pod with a 60mm macro lens. Setting the ISO at 100 to start. Un like film cameras there are Many ISO settings. the highest speed i could obtain here was 0.3 sec f 2.8
Setting the exposure at fist to

i have not used raw for this exercise .

Going through the scale from ISO 100 , 125,160,200,250,320,400,500,640,800,100,1250,1600,2000,2500,3250,4000,5000,6400,12800,

I think with to day improvements , hight ISo over 800 now yields better results then fats film . however now we are looking at ISO 12800 and above . Image capture has boundaries never imagined . but with the noise setting in over the 800 ISO mark as seen here . for crisp sharp images . keeping to under the 800 ISO is a must.

Below is the close up at 100 ISO


here is a close up at 12800 ISO


In observing this .  As the exercise stated . if the speed exceeds 1/2 sec exposure . On previous long exposures . another kind of noise takes over. 


i have added this , and in doing so noted how dramatic change set in at 1250 iso however after is backs off and then sets to be more visible 1600 . I note also some colour cast in the lower ISO a magenta in the whites where as moving up. The wall becomes whiter.


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