Product Description
SFFX-1 Back Focus (BF) Reference Data
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Telescope used | Extensions Provided for 55mm BF | BF without extensions/adapter |
80mm f-6 | 15mm and 33mm | 106 mm |
90mm f-6 | 40mm and 7mm | 104.8 |
102mm f-7 | 40mm | 97.8 mm |
130mm f-7 | 21mm and 15mm | 93.9 mm |
140mm f-6.7 | 21mm and 15mm | 93.7 mm |
152mm f-8 | 33mm | 90.5 mm |
180mm f7 | 33mm | 90.5 mm |
Stellarvue produces numerous extension tubes and spacer rings for photographic field flatteners. Our SFE-M69 extension tubes are compatible with this flattener. These extensions are placed between the flattener and the camera adapter. These extensions are not for the focuser side of the flattener. The thread on the focuser side is M68 so these extensions will not work on that side of the flattener.