&gt;<i>&quot;That said, it&#x27;s only little off.&quot;</i><p>It&#x27;s off by orders of magnitude.  KH-11 had&#x2F;has a 2.4m primary mirror.  Wikipedia (correctly) says the following:<p>&gt;<i>&quot;Assuming a 2.4-meter mirror, the theoretical ground resolution with no atmospheric degradation and 50% MTF would be roughly 15 cm (6 inches). Operational resolution would be worse due to effects of the atmosphere&quot;</i><p>16-point typeface is 5.8mm tall, so you probably need at least 0.58mm resolution to read it, and 2mm resolution to separate the characters.<p>2mm&#x2F;150mm = 1&#x2F;75 = 0.013<p>You need 75x better resolution than KH-11 to resolve characters.<p>0.58mm&#x2F;150mm = 0.0038<p>You need (1&#x2F;0.0038) 259x better resolution than KH-11 to read 16 point text.<p>You need ~2-2.5 orders of magnitude better resolution than the largest known earth-imaging satellite can provide, and that is assuming the phone is perpendicular to the satellite with no atmospheric distortion.