Oh, the CAMERA F-STOP...Silly me!
We have a thing in the USA, very popular tax collection measure by the various state Department of Motor Vehicles in the USA, where, if your auto insurance lapses for 30 days, you may get your auto registration suspended...If the police stop you, and they see in their computer that your insurance has lapsed, the can take your car and give you a big fine...This is called an 'F-Stop'...I deal with this on a regular basis.
I sell insurance and also do auto tag and registration work, so when I saw 'f stop', this is what I thought of...I thought maybe this happened to you and you took this as your pen name...
As for 'anti-semitism', this is a matter of semantics, as it is a term widely thrown around when criticism of things Jewish are spoken...Never used in relation to Arabs, who are true Semites.
Good luck with your photography, it is a valuable art form.Possible 'F Stops' in progress..'You got insurance?'