To master your imaging platform, you’ll have to know the resolution of your setup. Why should we bother about this? Let’s say, if your setup’s resolution is sub arcsec/pixel (measurement unit for resolution), you need a very stable mount, usually a high end German Equatorial Mount (GEM), for this. As the higher the resolution is (the lower the value of the resolution), any minor defect is easily seen. However, you are able to take high resolution images which are always honoured.
To calculate the resolution, follow the formula:
Resolution (arcsecond) = [CCD Pixel Size (micron) ÷ FL (mm)] * 206
Credit to Webfoot at Cloudy Nights forum for providing this formula. 
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