The best location I know for the Apollo images are the hi-res scans put up at the Apollo Archive. Unfortunately, the images don't seem to be broken out explicitly by camera, but in the Hasselblad Magazines section for Apollo 16 there are some that explicitly have 500mm in their name. It doesn't mention how they were taken, but the few I looked at do not appear to be taken through the lander window.

The best location I know for the Apollo images are the hi-res scans put up at the Apollo Archive. Unfortunately, the images don't seem to be broken out explicitly by camera, but in the Hasselblad Magazines section for Apollo 16 there are some that explicitly have 500mm in their name. It doesn't mention how they were taken, but the few I looked at do not appear to be taken through the lander window.

Edit: You might find this resource useful. In Part I it lists the 500mm Hasselblad as a "handheld" camera. It talks about how Hasselblad removed the SLR part of the camera and replaced it with a straight-through viewfinder that was then modified to be used with a helmet on.