Largest camera lens apeture you used - DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging - Cloudy Nights
Amazon.com : Monocular Industry Lens Max 120X 750mm C-Mount Glass Lens with 50mm Ring Adapter Holder for Industry Lab Microscope Camera CCTV : Electronics
Bower 650-1300mm F8.0 Digital Lens For Slr + T-mount + Cleaning Kit, 1 - Pay Less Super Markets
Kowa LMZ20750AMPDC-XF C-Mount 20-750mm Varifocal
Nikon Nikkor telephoto Lens Z 50-250mm, Black - Walmart.com
Mepro 750mm f11 Mirror Lens T mount with removable Nikon mount #10094 | eBay