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The main factors that influence the success of observations in the infraredrange (central wavelengths of the photometric bands at 3.75 and 4.8~$\mu$m) onthe multipurpose optical telescope are considered. Estimates of the skybackground brightness are obtained for the Caucasus Mountain Observatory (CMO)of Moscow State University: $1.3\cdot10^6$~photons/(s pixel) in the 3.75~$\mu$mband and $3.4\cdot10^6$~photons/(s pixel) in the 4.8~$\mu$m; and theinstrumental background for the 2.5-m CMO telescope at $0^\circ$C:$3.2\cdot10^6$~photons/(s pixel) in the 3.75~$\mu$m band and$4.3\cdot10^6$~photons/(s pixel) in the 4.8~$\mu$m band. It is shown that atthis background signal level with the currently available commercial cameras inthe $3-5$~$\mu$m spectral range, the telescope-camera coupling capabilities forobserving faint objects will still be limited by the thermal background. Fordifferent observational conditions, estimates of the limiting magnitudes ofobjects available for observations in the 3.75 and 4.8~$\mu$m ranges areobtained. For average observation conditions (instrument temperature of$0^\circ$C and stellar image size of 1 arcsec), the limit is $\sim10.6^m$ and$\sim8.4^m$, respectively.

moscow university physics bulletin

On the Effectiveness of Observations in the Mid-Infrared Wavelength  Range on the 2.5-Meter Telescope of the Caucasus Mountain Observatory of  Moscow State University with Commercial IR Cameras