Great timing Honey Monster!
I looked out and saw the moon Saturday night and thought, "Why not?" So this is the moon at 1680mm. (two 2x tc's plus one 1.4x tc)
F18, ISO400, 1/50th sec on a standard tripod and focused using contrast detect in live view. No crop
Sony A9, Pentax K1 MKii, Panasonic G9, Sony 200-600, Samyang 12mm F2 NCS CS, 7Artisans 7.5mm f2.8 fisheye, Panagor 90mm f2.8 Macro (OM), , Sigma APO 2x DG EX TC, Tiffen aXent ND 3.0 (ND1000) filter, Olympus OMD E-M5(drown in the Atlantic), Oly 14-42mm, Oly 12-50mm, ZEQ25gt Mount, plus a few other lenses, extension tubes, and general mish-mash