Well, for the series of having Night Vision fun with the classic telescopes that I already happen to have, yesterday I also set up the above Vixen-made little scope from the early 1980s with a 1.25" visual back, diagonal, my PVS-7 in prime focus, the
Astronomik 12nm Lumicon Night Sky filter, a period-correct heavy duty Vivitar tripod (still a bit shaky, unfortunately), and a Vixen fine motion adjustment tool between the tripod plate and the telescope.
If interested see a discussion on the 9VR here: https://www.cloudyni...co-9vr-60mm-f5/
I used my now obsolete Samsung Galaxy S5 and el-cheapo cell phone adapter, using the android app "Snap Camera HDR" that has a night vision/HDR mode that seems to allow averaging up to 7 shots. With my phone and based on empiric tests max ISO seems 1600 and longest exposures so far seem up to 1/10".
I spent a good part of the evening continuing to familiarize myself with the app menus, using Orion as target. Nothing special until the end, when I switched to the Rosette nebula after discovering how to edit "on the fly" some parameters of the 4-shot series I was taking, prior to having them averaged into one final image. I still have to figure out several details on how to do that but I found my best result far from perfect but encouraging, considering the small aperture of the telescope, the old technology of the phone camera, and a shaky tripod (but I had a 2-sec timer prior to taking the shot series). Focusing is also often off: even when set to infinity, the camera keeps adjusting and/or screwing up focus. But out of many shots I got two better ones, and this is the best. Once I got it, I installed the Pentax 50mm camera lens on the PVS-7 and I made the low-power observations of my other post from last night.