High quality 100mm refractor style optical tube features fully coated glass optics.

https://www.amazon.com/Celestron-Refractor-Smartphone-Refracting-22403/dp/B01L0EQPLC/ref=sr_1_3?dib=eyJ2IjoiMSJ9.5SwYSDFDkRfSopueMjR8ydA-9KfS5Bgi5-EC1OpUzfThl3L1qFQDarMEn030PuWbhf_O3TJQfhlaS4M9uklqry7DMYZZs05yo50PIbKQWCLDvvBagmhh0O5q8NmrCsJfT2TKhIars3sAYdsbE16E0hsDYniw2TSfU3uHhLpZqzFt6_2TJk4A4L1u6aD-_ciDqWp-3gJUztDclzkMgTd5sfP_57HGigJlWAoJAt9FMD4.CpzgLTgc4mMAFSsYJPFA50_1Zj3gRYV6C6a00LtcyWw&dib_tag=se&keywords=celestron%2Binspire%2B100az%2Btelescope&qid=1732171121&sr=8-3&ufe=INHOUSE_INSTALLMENTS%3AUS_5M_VENDOR_FUNDING&th=1