Device designed to receive an incident light flux comprising a first band (λ1) of wavelengths and a second band (λ2) of wavelengths, the first band and the second band being separate from each other, comprising: - a primary mirror, - a secondary mirror, - a first semi-reflective dichroic filter, and - a second semi-reflective dichroic filter, the primary mirror being designed to receive the incident light flow and reflect it towards the secondary mirror; the secondary mirror being designed to receive the light flow from the primary mirror and reflect it towards the first semi-reflective filter; the device being characterised in that it further comprises: a double bending system of the second band (λ2) of wavelengths, the first semi-reflective filter being designed to transmit the first band (λ1) of wavelengths towards an objection through the second semi-reflective filter, and to reflect the second band (λ2) of wavelengths towards the double bending system of the second band (λ2) of wavelengths; the second semi-reflective filter being further designed to receive the second band (λ2) of wavelengths from the double bending system, and to reflect the second band (λ2) of wavelengths towards the objection, the device comprising a real entrance pupil through which the incident light flow passes, the secondary mirror being designed to receive the light flow from the primary mirror and reflect it in order to form a real intermediate pupil. - a primary mirror, - a secondary mirror, - a first semi-reflective dichroic filter, and - a second semi-reflective dichroic filter, the primary mirror being designed to receive the incident light flow and reflect it towards the secondary mirror; the secondary mirror being designed to receive the light flow from the primary mirror and reflect it towards the first semi-reflective filter; the device being characterised in that it further comprises: a double bending system of the second band (λ2) of wavelengths, the first semi-reflective filter being designed to transmit the first band (λ1) of wavelengths towards an objection through the second semi-reflective filter, and to reflect the second band (λ2) of wavelengths towards the double bending system of the second band (λ2) of wavelengths; the second semi-reflective filter being further designed to receive the second band (λ2) of wavelengths from the double bending system, and to reflect the second band (λ2) of wavelengths towards the objection, the device comprising a real entrance pupil through which the incident light flow passes, the secondary mirror being designed to receive the light flow from the primary mirror and reflect it in order to form a real intermediate pupil. the primary mirror being designed to receive the incident light flow and reflect it towards the secondary mirror; the secondary mirror being designed to receive the light flow from the primary mirror and reflect it towards the first semi-reflective filter; the device being characterised in that it further comprises: a double bending system of the second band (λ2) of wavelengths, the first semi-reflective filter being designed to transmit the first band (λ1) of wavelengths towards an objection through the second semi-reflective filter, and to reflect the second band (λ2) of wavelengths towards the double bending system of the second band (λ2) of wavelengths; the second semi-reflective filter being further designed to receive the second band (λ2) of wavelengths from the double bending system, and to reflect the second band (λ2) of wavelengths towards the objection, the device comprising a real entrance pupil through which the incident light flow passes, the secondary mirror being designed to receive the light flow from the primary mirror and reflect it in order to form a real intermediate pupil. a double bending system of the second band (λ2) of wavelengths, the first semi-reflective filter being designed to transmit the first band (λ1) of wavelengths towards an objection through the second semi-reflective filter, and to reflect the second band (λ2) of wavelengths towards the double bending system of the second band (λ2) of wavelengths; transmit the first band (λ1) of wavelengths towards an objection through the second semi-reflective filter, and to reflect the second band (λ2) of wavelengths towards the double bending system of the second band (λ2) of wavelengths; the second semi-reflective filter being further designed to receive the second band (λ2) of wavelengths from the double bending system, and to reflect the second band (λ2) of wavelengths towards the objection, receive the second band (λ2) of wavelengths from the double bending system, and to reflect the second band (λ2) of wavelengths towards the objection,