Astrozap Focusing Cap

The shutter mechanism allows you to quickly open the aperture to achieve precise focus without needing to remove or replace a mask. Once you have locked in your focus, you can simply close it to protect your optics or capture dark frames.

This model is designed specifically for telescopes with an aperture range of 280mm to 298mm. Please measure the outer diameter of your telescope's front cell to ensure a proper fit before purchasing.

No tools are required. The cap is designed for tool-free operation, utilizing a simple thumbscrew to adjust the shutter mechanism, which makes it easy to use even in the dark.

Yes, it functions as a durable dust cover when fully closed. Its aluminum construction and powder-coated finish provide reliable protection for your telescope's optics when the equipment is not in use.

Absolutely. Beyond assisting with focus, the shutter design is specifically helpful for capturing dark frames, as you can close the aperture securely without needing to remove the cap from the telescope.