Lens system intended for microscopic observation and operationally associable with an image acquisition device and a light source, said system comprising: - a pair of thin films (12, 14) made of transparent and incompressible material, including a first thin film having a substantially flat first outer surface intended to face towards an external image acquisition device, and a substantially flat first inner surface facing towards the opposite side with respect to the first outer surface and towards the inside of the system, and a second thin film having a substantially flat second outer surface intended to face towards an external sample to be observed, and a substantially flat second inner surface facing towards the opposite side with respect to the second outer surface and towards the inside of the system; - at least one pair of lenses (16, 18) having a short focal length and made of transparent material, including a first lens having a first flat contact surface coupled to said first inner surface, and a first curved surface, and a second lens having a second flat contact surface coupled to said second inner surface, and a second curved surface facing towards said first curved surface; - a separation portion positioned between said inner surfaces (12b, 14b) and positioned laterally relative to said lenses (16, 18), so as to space out said curved surfaces (16b, 18b); characterized in that said separation portion is made of compressible elastic material; in that such system further comprises an end-of-travel spacer portion made of rigid material and located between said inner surfaces (12b, 14b); and in that said end-of-travel spacer portion is configured for abutting against one of said inner surfaces (12b, 14b), so as to prevent the distance between the lenses (16, 18) from falling below a predefined value. - a pair of thin films (12, 14) made of transparent and incompressible material, including a first thin film having a substantially flat first outer surface intended to face towards an external image acquisition device, and a substantially flat first inner surface facing towards the opposite side with respect to the first outer surface and towards the inside of the system, and a second thin film having a substantially flat second outer surface intended to face towards an external sample to be observed, and a substantially flat second inner surface facing towards the opposite side with respect to the second outer surface and towards the inside of the system; a first thin film having a substantially flat first outer surface intended to face towards an external image acquisition device, and a substantially flat first inner surface facing towards the opposite side with respect to the first outer surface and towards the inside of the system, and a second thin film having a substantially flat second outer surface intended to face towards an external sample to be observed, and a substantially flat second inner surface facing towards the opposite side with respect to the second outer surface and towards the inside of the system; - at least one pair of lenses (16, 18) having a short focal length and made of transparent material, including a first lens having a first flat contact surface coupled to said first inner surface, and a first curved surface, and a second lens having a second flat contact surface coupled to said second inner surface, and a second curved surface facing towards said first curved surface; a first lens having a first flat contact surface coupled to said first inner surface, and a first curved surface, and a second lens having a second flat contact surface coupled to said second inner surface, and a second curved surface facing towards said first curved surface; - a separation portion positioned between said inner surfaces (12b, 14b) and positioned laterally relative to said lenses (16, 18), so as to space out said curved surfaces (16b, 18b); characterized in that said separation portion is made of compressible elastic material; in that such system further comprises an end-of-travel spacer portion made of rigid material and located between said inner surfaces (12b, 14b); and in that said end-of-travel spacer portion is configured for abutting against one of said inner surfaces (12b, 14b), so as to prevent the distance between the lenses (16, 18) from falling below a predefined value. characterized in that said separation portion is made of compressible elastic material; in that such system further comprises an end-of-travel spacer portion made of rigid material and located between said inner surfaces (12b, 14b); and in that said end-of-travel spacer portion is configured for abutting against one of said inner surfaces (12b, 14b), so as to prevent the distance between the lenses (16, 18) from falling below a predefined value.