This is a Sources Sought notice for market research, not a solicitation. The National Institute on Aging requires a Visitech VT-iSIM Flat Top & Full Field upgrade to increase the field of view and add broadband, homogenous illumination to a super-resolution microscope. The upgrade is essential for maintaining a state-of-the-art system for NIA investigators. No budget amount, performance location, or submission timeline are specified. Small businesses are encouraged to respond.