Illumina NextSeq 550 optical system and the 'tick-tock approach'
Nava Whiteford wrote a detailed post on the NextSeq 550 imaging System and Fluidics here:
The NextSeq 500 (and later 550 with compatibility with iScan microarray scanning module) was the first mid-throughput instrument that Illumina put into the market.
The rationale back then (I was an employee at Illumina UK on the R&D site) was that there was a market…