28 Higher and Lower Sensitivity

This exercise requested that we produce 6 shots at normal (100 ISO) and 6 at high (ISO 800) sensitivity. In a situation were the lighting levels were marginal for the normal sensitivity and compare the results.

I chose to document shoppers in the undercover Victoria Market, it was a bright sunny day outside, but the large covered in market area is dark by comparison. For reference the images at 100 ISO are typically shot at 1/10-1/25 sec at f2.8-f4 and those at 800 ISO are typically 1/60-1/200 sec at f2.8-f5.6.

Equipment used Fujifilm Xpro-1, 18-55mm (optical stabiliser turned off) , NX2 and DXO (noise reduction turned off).

Low sensitivity 100 ISO

In this situation the following factors were noted about these images.

Pros

  • Noise levels in the image are very low and enlarged sections of the image show little noise issues.

Cons

  • Camera shake a slower shutter speeds – I had deliberately turned optical stabilisation off.
  • Motion blur on most moving subjects.
  • Only able to use open aperture – Low depth of field.

Images:

DSCF7814l_DxO DSCF7867l_DxO

DSCF7789l_DxO

DSCF7810l_DxO

DSCF7868l_DxO DSCF7834l_DxO

DSCF7820l_DxO

High sensitivity 800 ISO

In this situation the following factors were noted about these images.

Pros

  • Motion blur eliminated or reduced to acceptable limits.
  • Increased depth of field available.

Cons

  • Noise levels in the image are higher and enlarged sections of the image show  noise issues. But as with many of the newer sensors this is not a real issue till 3200 ISO.

Images:

DSCF7861h_DxO

DSCF7850h_DxO

DSCF7835h_DxO

DSCF7878h_DxO

DSCF7854h_DxO

DSCF7842h_DxO

Even though I chose to use the highest sensitivity setting suggested for the exercise, the noise of the 800 ISO images is not significant even with noise reduction turned off in camera and DXO. Any loss in quality by using a higher ISO was more than compensated for by being able to shoot sharp images and reduce motion blur. It would also enable the use of a longer lens to perhaps gain even more candid shots.

Considering the grain that would appear on an 800 ISO film this noise acceptable, at higher ISO’s though ie 3200 and above the impact of the noise is considerable at which point it does detract/degrade the image. But even then if there is no alternative such as faster lenses, tripod for a static subject or increased lighting, getting the shot is always better than no shot!

 

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