LUNT LS60FHa (0550250) General Features: 60mm front-mounted non-obstructed hydrogen-alpha filter for use on a wide range of telescopes! Connect the Lunt LS60FHa to your telescope with the appropriate adapter (sold separately), or use it to double-stack on an existing Lunt 60mm solar telescope or filter for a ~<0.5A band pass! Choose the appropriate LS60FHa and blocking filter for your telescope’s focal length and focuser size. Required Accessories: Typically an adapter plate will be required to attach a Lunt Solar Filter to the front of a customer-supplied telescope. These adapters are in stock for the more common user scopes, but can be custom made to your specific requirement if needed. No adapter is needed to connect one LS60FHa to another for double-stacking. Please Note: If this product shows “Available on Backorder” and you would like to “get in line” by placing an order with a 10% deposit, send us an email. A member of our staff will contact you with lead times and deposit information.