This red filtered image show the dusty comet head, because the old FLI filter wheel was stuck in the "Red" position with the error code 203 (-19 sometimes ). I have asked FLI what the meaning of these error codes are. No answer. I don't think they know.
Time to save money for a ToupTek ATR294C or equivalent color camera.

Anyway this comet is brighter than predicted and if no disintegration, it could be a splendid photo object in the evening sky in November. Faint tail started 25. August and is obvious in the image on September 6.

Sun distance (au): 1,19 Perihel 8. November 2025 Sun distance (au): 0,53

Time: 02:47UT 2025-09-19 28 x 125sec. Red filter
Tel: C14 @ f/5.2 ST-7 CCD -20°C 1"/pix Paramount GT-1100S


Time: 02:26UT 2025-09-13 20 x 65sec. DSS II underlay
Tel: C14 @ f/5.2 ST-7 CCD -16°C 1"/pix Paramount GT-1100S


Time: 02:35UT 2025-09-07 28 x 65sec.
Tel: C14 @ f/5.2 ST-7 CCD -16°C 1"/pix Paramount GT-1100S
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.