What is smearless readout?
Smear is caused by an unwanted charge build-up in the CCD vertical registers during the time before the actual shutter time and during the readout time. In smearless mode the smear level can be reduced, if the CCD is read out with a high speed just before the actual triggered shutter time. It will reduce the smear effect above the highlighted areas. Below there is no reduction. In smearless mode, the trigger will start this dummy readout before the accumulation starts, causing a small delay.
