SPX350 F4.5, ATK-16HR, Baader RGB Astronomik IR742nm filters.
This Terzan is North of Scorpius Tail and a shade south of star 45 Oph. In the dust this would look interesting in IR to see through the dust for better contrast. Notice the star a touch right of the cluster in IR is very bright compared with RGB. If you flick from one image to the other you can see the IR stars switch on and off as the dust disappears.
Thanks everyone, the IR brand Marc is Astronomik 742nm from 742nm till the sensor cuts off at 1050nm. It is used for planetary but works well in deep space in Sag and Sco dust but needs to be refocused compared to the Baader RGB filters but my OAG can still guide on the stars.