Player One S-Series 1.25 inch ERF Filter - Dark Clear Skies Astrophotography Telescope or compact telescope stays securely

or compact telescope stays securely in position

According to the introduction of technical documents

5mm Field Stop Diameter 6

It saves time

Thickness of Filter Lens: 2

Player One S-Series 1.25 inch ERF Filter - Dark Clear Skies Astrophotography Telescope or compact telescope stays securelyPlayer One S Series 1. 25 inch ERF Filter SKU: ERF125 Category: Filter and Wheel Description: The Player One S Series 1. 25 inch ERF Filter utilizes high quality optical glass substrate and multi layer composite coating technology, ensuring excellent optical performance for astrophotography. The ERF filter is an assistant filter specifically designed for the Quark Chromosphere (Ha version). Its purpose is to reject excess energy and extend the