Celestron Omni XLT 120mm Achromat Refractor. I bought this used and refurbished parts of it, including a GSO 2" Crayford Linear Bearing dual speed focuser (I needed beef here to hold imaging equipment with zero slop), extra long mounting dovetail to get good balance after imaging gear is loaded, and replaced the lens cap with a LensCoat hoodie (XXL). Shown here it is configured with a diagonal, 2" UV/IR cutter (internal), 50mm extension to achieve focus, and a Quark (Ha filter). This is a dedicated solar surface scope in hydrogen alpha. It's huge on my pier (which is 10" diameter and pretty much just as long, this thing is 40 inches).