152mm A+M Refractor(OfficinaStellare-1200mmF/L) using a TeleVue 2XPowerMate for an effect of 2400mmFL using a Baader 7nm HydrogenAlpha and SII , and Lumicon UHC(wide-band OIII) 2in. filter . **** I did one 127secISO3200 and one 127secISO6400 and one 187secISO3200 and one 187secISO6400 and one 247secISO3200 and one 247secISO6400 for the UHC and the Ha filter separately ; and two 487secISO3200 and two 487secISO6400 for the SII 2in. filter as RAWMonochrome images thru MaximDL Pro V6.16 . {{{{{{{{{ When I changed to the SII filter after the UHC images while doing M16.... the ASCOM Astro-Physics V2 Driver wanted to 'update' and wouldn't 'connect' ; it took about 35 minutes to get the laptop going again after it decided to 'Restart' itself last night Aug. 2 2021 or I would have got more images .... and the sky was clear .*****x Also , the DSLR's 'Long Exposure Noise Reduction ON' was used . I did do what Astro-Physics site said which was go to ASCOM and download the latest Platform and then I 'installed' it . I went back to the Astro-Physics site and followed the link to Ray Garalak's ASCOM Astro-Physics V2 Driver and I downloaded and 'installed' the v5.30.00 Driver which replaced the v5.10.02 Driver I was using .... and last night Aug. 4 2021 I started imaging the 'Bubble Nebula' as UHC-SII Ha but UHC and Ha were really dim at 247secISO3200-6400 and SII for 487secISO3200-6400 was also dim , but I didn't try to stack them yet ..The 'Backyard Astronomer's Book' say they always use the DSLR's 'Long Exposure Noise Reduction ON ' which is on page 305 top right instead of 'dark-frames' . Also , it seems as though the SulfurII (SII) filter with the Astronomically friendly Hutech modified DSLR needs three times the exposure length as the UHC and Ha filters because the DSLR's internal cut-off filter only allows about 20% passage of the SII region x
