Achieve perfect focus on the stars with the our precision focusing filter.

Please see notes on current shipping delays due to the COVID-19 pandemic below.

  • available exclusively on
  • three square filter sizes available (85mm, 100mm, & 150mm)
  • requires a square filter holder and the appropriately-sized system adapter ring to fit your lens (not included)
  • includes Quick Start Guide with simple instructions for getting started
SKU: N/A Category:


View our product details page for more information and instructions for use.

In-stock items ship out in 1-2 business days. Backordered items ship out in 2-3 weeks.

Please note all shipments are currently experiencing delays due to COVID-19 and limited air transportation availability. We truly appreciate your business and patience during this time.

Domestic Shipping Delays: We are currently experiencing shipping delays of 1-2 weeks on domestic shipments that normally take 2-3 days. 

International Shipping Delays: We are currently experiencing more extreme delays on international shipments.  In some cases, shipments are taking 2 months to reach their destination. We are temporarily holding the shipment of most international orders until the situation improves. If your order is held, you’ll receive an email from us, and you can cancel  your order at any time before it ships by responding to that email. You can check the USPS International Service Disruptions page for country-specific information.

*Ships from Illinois or California. Tracking may not be available for certain international destinations. You are responsible for any customs fees imposed by your country (e.g. VAT is not included).

Additional information


85mm square filter, 100mm square filter, 150mm square filter