Microbiological imaging in compact and integrated devices allows for a variety of applications such as endomicroscopy or neuroscience. Typically, such devices require a large field-of-view with a high resolution to visualize cellular details and a high light collection efficiency to improve the signal-to-noise ratio and reduce exposure times. Thus, high numerical apertures are required. Miniature objectives with a numerical aperture of 0.7, a field-of-view diameter of 264 μm in the sample plane and color correction for a wide spectral range (450 nm – 900 nm) are offered by the company GRINTECH GmbH. However, while these accept curved sample fields as a degree of freedom, many demanding applications in the area of endo- and point-of-care-microscopy desire a field as flat as possible.