new_contents: from bin.models import *
  from django.contrib import admin
  
  admin.site.register(Camera)
  admin.site.register(Telescope)
  admin.site.register(Mount)
  admin.site.register(FocalReducer)
  admin.site.register(Subject)
  admin.site.register(User)
  admin.site.register(Image)
  
  
subject: Add models to admin interface.