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.

high light clipping Exercise 6

 After going through the exercise on linear capture . And now reading this about highlight clipping, I can now see why the debate continues "digital will never out perform film. as the Latitude of film is so much grater. Digital is more like transparency with more limitations. So Technology has yet to over come these hurdles. Some how, I feel we are a long way off getting it right. Even after this course was written. I found the newer cameras are still not what I had hoped, after using medium format. Im a Fool for selling mine at the time.

The 7d I am now using. So much highlights are lost . Reading through. I have come to terms that when photographing with digital. The rules are some what opposite to film . Especially Black and white.

In black and white . The old rule of thumb , was to expose for the shadows letting the highlights look after them selves. However , here we need to expose for the highlights.

Here I have taken a picture, a side look of a work top. Exposing  correct exposure.  Then 1 full stop open, then stopped down 1 again 1 and then again 1 stop down :



starting at F 5 1/8 sec 400ISO

 1 stop up F4

 1 stops down 5.6

 2stops f8

 3 stops down F10

Depending on how much highlights are in the scene . I note that the top picture, highlights or white areas have lost all detail. Average exposure still lacks detail on the second photo. By stopping down 1 stop . This holds details and colour . 2 stops down, still holds detail in the highs and the lows shadow areas . 3 stops down, and shadow areas starts to lose detail.