DAS Photonics is ending the demonstrator of the RETINA Project which aims to develop several key RF-photonic building blocks, designing, fabricating and testing: multi beam TTD phased array antennas for X band, a photonic integrated beamforming network, novel configuration active X band antenna array and miniaturized space grade components and subsystems. RETINA integrates such building blocks in a test bed proving the suitability of the architecture in a SAR scenario for 64 beams, demonstrating a flexible SAR payload for missions requiring flexible frequency plans, channelization and dynamic coverage operation.