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In TV-NP127is documentation I found following line "To start, you need to know the distance from the chip to the faceplate of the camera. This should be specified in the camera’s documentation; call your camera’s manufacturer if it is not. The equation is simply 2.6” — Chip to faceplate distance = additional spacer length required." So distance from camera sensor to telescope connection thread should be 2.6" (66.04 mm). I make calculations of backfocuse for my accessories and I got: - QHY600M (backfocuse) + adapter - 23.5mm - Atik EFW2 - 22.0 mm - Atik OAG - 24.mm Total: 69.5 mm (3.46 mm longer distance). I need to add also adapter from 2.4" to M54 thread in OAG (another 1-2mm added to distance). So it will give finally approximately 72mm (~6mm longer distance). In your setup you can you catch the focus immediately after camera and accessories connection? Whether the manufacturer has provided a certain range for the focuser work? |