I use a Coronado SM60 external Etalon fitted to the Takahashi FS-60C with Tak's 1.7x module to get to f/10 followed by the BF30 blocking filter, 2x Tele Vue PoweMate and the image is captured using the ZWO ASI174MM camera.
I use a Coronado SM60 external Etalon fitted to the Takahashi FS-60C with Tak's 1.7x module to get to f/10 followed by the BF30 blocking filter, 2x Tele Vue PoweMate and the image is captured using the ZWO ASI174MM camera.