Here is a list of photographic cameras used for Apollo 16.
There were two Lunar Surface Data Hasselblads equipped with a 60 mm lens for both astronauts to be used with chest mounts to the space suits. The astronauts had special training to use them without viewfinder. The astronauts were very successful in aiming with their cameras.
But what about the third Lunar Surface Hasselblad Camera with a 500 mm lens? Using a 500 mm lens without viewfinder would be difficult. The Camera was used with 70 mm film, the image size was about 53 X 53 mm. For 35 mm film and 24 x 36 mm format, the equivalent focal length would be about 288 mm.
Did they use the original waist-level viewfinder of the Hasselblad single-lens reflex cameras? Was this camera used only without helmet inside the pressurized cabin of the the Lunar Module or was it used also with closed helmet on the Moon's surface? Or was a special designed viewfinder for use in space added?