To use the MASK PRO System, simply install the Mask Holder onto your telescope, then its as simple as sliding in the slide of your choice!
Want to use the Bahtinov Mask? No Problem ... Just Slide it in! And when your done, simply Slide it out! Want to use the 8x Diffraction Spike Mask? No Problem ... Just Slide it in! And when your done, simply Slide it out! Want to use your telescope with no Mask? No Problem ... Leave the Holder attached and enjoy!
Warning: Remember to always remove the Mask Pro Holder prior to powering down your telescope.