A rheumatoid factor (RF) test is a blood test that can help diagnose rheumatoid arthritis (RA). The test measures the amount of rheumatoid factor in your blood. Rheumatoid factor is an autoantibody ...

Canon, working alongside Apple, have created three dual lenses, and one is specifically targeted at Spatial creators: the RF-S 7.8mm STM DUAL lens, for the EOS R7 (APS-C) body. Two lenses, close up in ...