The Maxi filter wheel is ideal for use with larger format cameras, as it has the ability to carry up to 7 x 2 inch square filters, or 9 x 2 inch round filters. It also has a large input/output aperture of up to 65mm clear diameter (72mm x 1mm threads). The built-in off-axis guide assembly makes it easy to use with most guide cameras (Lodestar X2/Lodestar PRO or the Ultrastar/Ultrastar PRO are highly recommended).