SffRSamfylkingarfélagið Í Reykjavík (Icelandic: Social Democratic Alliance Federation of Reykjavik; Reykjavik, Iceland)
SffRSioux Falls Fire Rescue (Sioux Falls, SD)
SffRSvensk Förening för Radiofysik (Swedish Society of Radiation Physics)
SffRSouth Fork Feather River (California)
SffRShavers Fork Fire Rescue (Pocahontas County, WV)
SffRStandard for Full Registration (teaching)
SffRSpace Free-Flying Robot (various universities)
SffRStrategy and Future Forces Review
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References in periodicals archive ?
Stellarvue's matched SFFR.72-130 focal reducer/field flattener produces a large, well-corrected and -illuminated field for large-format sensors.
Stellarvue also auto-collimates the SFFR.72-130 to the main objective for each individual scope--an outstanding touch!
The SFFR.72-130 is not for visual use, so it is a bit of extra effort to switch back and forth between photo and visual configurations because you need to completely remove the focuser to deal with the extension--probably not the kind of thing you would want to be doing in the middle of the night at the scope.