I have an F1, and its ok. As long as the is alot of light. And gets flakey in the evening without good light.

I myself would rather have a ProChrony. My buddy Mossyoak33 on here got one and works very well

http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0004513221339a&type=product&cm Cat=SEARCH&returnPage=search-results1.jsp&QueryText=Chronograph&N=4887& amp;Ntk=Products&Ntx=mode+matchall&Nty=1&a mp;Ntt=Chronograph&noImage=0