Clcik on the image to enlarge
Luminous-landscape written a very informative article on DSLR unexpected ISO behavior, Major camera manufacturers DSLRs are silently increasing the ISO without photographer’s knowledge. The data for whole analysis is given by DxO lab.
The above graph show the light loss at the sensor for different Canon and Nikon cameras when using a f/1.4 lens. For example the Canon EOS5D has -0.25 the D3s has -0.30 EV light loss…click on the image to see the larger version. In order to compensate for this light loss and produce correctly exposed images, camera manufacturers are compensating by silently increasing the ISO.
Read More at luminous-landscape
