spotting scope vs telephoto lens - Matt Francis
sony kowa 60x MF.jpg:

sony kowa 60x MF.jpg:

Sony A7r2 Kowa TSN-883 spotting scope w/TE-11WZ 25-60x zoom eyepiece using the Kowa TSN-PA7 DSLR digiscoping adapter. ISO 400 1/40 sec
Used in camera “focus help” for precise focus