Carlton Astronomy and Entomology:
AP 4 inch objective (1)
Carlton Astronomy and Entomology:
AP 4 inch f10 focuser
Carlton Astronomy and Entomology:
AP 4 inch f10 with finder and rings
Carlton Astronomy and Entomology:
AP 4 inch serial number with image flipped for outside circumference view
Carlton Astronomy and Entomology:
PierAP1988_4inch