Scalable aperture-combined optical telescope, comprising several optical assemblies, which each comprise: - an optical tube aimed to a target, with an aperture for receiving light, a light output and an output axis, - an active optical package, associated to the light output, which comprises: - an atmospheric dispersion corrector associated to the light output, - a focuser following the atmospheric dispersion corrector, - a tip-tilt refractive compensator following the focuser, - an image device, intended to receive the light from the tip-tilt refractive compensator and acquire images; - a flat diagonal flip mirror following the tip-tilt refractive compensator, intended to reflect the light onto the image device, and which comprises a drilled hole with capacity of being aligned with the output axis of the optical tube, - an alignment frame, following the flat diagonal flip mirror, - a first optical fiber, fixed to the alignment frame, and inserted in the drilled hole of the flat diagonal flip mirror, intended to capture the incoming light from the target, wherein each first optical fiber is of multimode optical fiber type, and the scalable aperture-combined optical telescope additionally comprises: - a photonic lantern configured to combine several first optical fibers in a final single optical fiber of multimode optical fiber type, by stacking and tapering the first optical fibres with high core-to-cladding ratios such that the claddings, when tapered, become too thin to efficiently confine light, and - the final single optical fiber, that connects the photonic lantern to a measuring device. several optical assemblies, which each comprise: - an optical tube aimed to a target, with an aperture for receiving light, a light output and an output axis, - an active optical package, associated to the light output, which comprises: - an atmospheric dispersion corrector associated to the light output, - a focuser following the atmospheric dispersion corrector, - a tip-tilt refractive compensator following the focuser, - an image device, intended to receive the light from the tip-tilt refractive compensator and acquire images; - a flat diagonal flip mirror following the tip-tilt refractive compensator, intended to reflect the light onto the image device, and which comprises a drilled hole with capacity of being aligned with the output axis of the optical tube, - an alignment frame, following the flat diagonal flip mirror, - a first optical fiber, fixed to the alignment frame, and inserted in the drilled hole of the flat diagonal flip mirror, intended to capture the incoming light from the target, - an optical tube aimed to a target, with an aperture for receiving light, a light output and an output axis, - an active optical package, associated to the light output, which comprises: - an atmospheric dispersion corrector associated to the light output, - a focuser following the atmospheric dispersion corrector, - a tip-tilt refractive compensator following the focuser, - an image device, intended to receive the light from the tip-tilt refractive compensator and acquire images; - a flat diagonal flip mirror following the tip-tilt refractive compensator, intended to reflect the light onto the image device, and which comprises a drilled hole with capacity of being aligned with the output axis of the optical tube, - an alignment frame, following the flat diagonal flip mirror, - a first optical fiber, fixed to the alignment frame, and inserted in the drilled hole of the flat diagonal flip mirror, intended to capture the incoming light from the target, - an atmospheric dispersion corrector associated to the light output, - a focuser following the atmospheric dispersion corrector, - a tip-tilt refractive compensator following the focuser, - an image device, intended to receive the light from the tip-tilt refractive compensator and acquire images; - a flat diagonal flip mirror following the tip-tilt refractive compensator, intended to reflect the light onto the image device, and which comprises a drilled hole with capacity of being aligned with the output axis of the optical tube, - an alignment frame, following the flat diagonal flip mirror, - a first optical fiber, fixed to the alignment frame, and inserted in the drilled hole of the flat diagonal flip mirror, intended to capture the incoming light from the target, wherein each first optical fiber is of multimode optical fiber type, and the scalable aperture-combined optical telescope additionally comprises: - a photonic lantern configured to combine several first optical fibers in a final single optical fiber of multimode optical fiber type, by stacking and tapering the first optical fibres with high core-to-cladding ratios such that the claddings, when tapered, become too thin to efficiently confine light, and - the final single optical fiber, that connects the photonic lantern to a measuring device. - a photonic lantern configured to combine several first optical fibers in a final single optical fiber of multimode optical fiber type, by stacking and tapering the first optical fibres with high core-to-cladding ratios such that the claddings, when tapered, become too thin to efficiently confine light, and - the final single optical fiber, that connects the photonic lantern to a measuring device.