Bresser single linear 2” polarizing filter has a barrel diameter of 2”. With this filter, you can study the minutest details of the Moon.
The 2” filter can also be used with the Bresser Advance ICD 10–160x and Bresser Science ETD 101 7–45x microscopes for the suppression of reflections (e.g. on metal components, soldering points). It is connected via the M48 thread.