|M13 with a 4 inch telescope|
Telescope: Astro-Physics Traveler EDF 105mm F/5.8
Eyepieces: Televue Ethos 8mm
Transparency: 3/5, 21.3 SQM
Notes: Lots of 14th magnitude stars coming in and out. This aperture appears to be the limit to observe M13 seriously. NGC 6207 is small and faint. It has a very stellar nucleus.