Calculate lens focal length from desired field of view

Calculate field of view for a given lens focal length.  If a Sunex lens, specify PN:

Sunex PN: DSL030A-NIR-F0.66 DSL092A-780-F0.7 DSL115A-NIR-F2.0 DSL115C-650-F1.5 DSL115C-NIR-F1.5 DSL133A-650-F2.0-HP3 DSL137A-NIR-F2.35 DSL143D-NIR-F1.4 DSL145A-650-F2.0-HP3 DSL146A-650-F1.4 DSL146A-BP940-F1.4-TOF DSL146A-NIR-F1.4 DSL146A-NIR-F1.4- TOF DSL147A-650-F1.4 DSL147A-BP940-F1.4-TOF DSL147A-NIR-F1.4 DSL162A-650-F1.6 DSL162A-700-F1.6 DSL162A-NIR-F1.6 DSL163A-650-F1.8 DSL163A-700-F1.8 DSL163A-NIR-F1.8 DSL165A-650-F1.6 DSL165A-700-F1.6 DSL165A-NIR-F1.6 DSL166A-650-F1.6 DSL166A-700-F1.6 DSL166A-NIR-F1.6 DSL168A-650-F2.0 DSL168A-NIR-F2.0 DSL180A-690-F2.0 DSL180A-NIR-F2.0 DSL180B-690-F2.0 DSL180B-NIR-F2.0 DSL181B-650-F2.2 DSL181B-NIR-F2.2 DSL181C-650-F2.2 DSL182B-650-F2.2 DSL182B-IRC41-F2.2 DSL182B-NIR-F2.2 DSL182G-650-F2.2 DSL182G-650-F2.2-HP3 DSL182G-NIR-F2.2 DSL182L-650-F2.2-THR DSL183B-NIR-F2.2 DSL183C-650-F2.2 DSL183C-NIR-F2.2 DSL184A-650-F2.0 DSL184A-NIR-F2.0 DSL184B-650-F2.0 DSL184B-NIR-F2.0 DSL186A-650-F1.8 DSL186A-IRC41-F1.8 DSL186A-NIR-F1.8 DSL188A-650-F2.0 DSL188A-NIR-F2.0 DSL189A-650-F2.0 DSL189A-IRC41-F2.0 DSL189A-IRC42-F2.0 DSL189A-NIR-F2.0 DSL198A-650-F2.0 DSL198A-NIR-F2.0 DSL202A-650-F2.6 DSL202A-NIR-F2.6 DSL208A-650-F2.0 DSL208A-650-F4.0 DSL208A-NIR-F2.0 DSL208A-NIR-F4.0 DSL209A-650-F2.0 DSL209A-NIR-F2.0 DSL209K-650-F2.0-HP3 DSL212D-650-F3.0 DSL212D-NIR-F3.0 DSL212F-645-F3.0 DSL213A-645-F2.0 DSL213A-670-F2.0 DSL213A-IRC40-F2.0 DSL213A-NIR-F2.0 DSL215B-690-F2.0 DSL215B-IRC40-F2.0 DSL215B-NIR-F2.0 DSL215C-650-F2.0 DSL215C-NIR-F2.0 DSL215D-690-F2.8 DSL215E-NIR-F2.0 DSL216A-670-F2.0 DSL216A-670-F2.8 DSL216A-NIR-F2.0 DSL217C-650-F1.8 DSL217C-670-F1.8 DSL217C-NIR-F1.8 DSL217D-NIR-F1.8 DSL218A-670-F2.0 DSL218A-NIR-F2.0 DSL219D-650-F2.0 DSL219D-NIR-F2.0 DSL219E-670-F2.0 DSL224D-650-F2.0 DSL224D-670-F2.0 DSL224D-NIR-F2.0 DSL227A-650-F2.0 DSL227A-NIR-F2.0 DSL227D-NIR-F2.0 DSL228A-670-F2.0 DSL235D-650-F2.2 DSL235D-650-F3.2 DSL235D-IRC40-F3.2 DSL235D-NIR-F2.2 DSL235D-NIR-F3.2 DSL235E-650-F3.2 DSL235E-NIR-F3.2 DSL236E-670-F2.0 DSL239A-650-F2.4 DSL239A-NIR-F2.4 DSL239B-NIR-F2.4 DSL240A-650-F2.1 DSL240A-NIR-F2.1 DSL248F-650-F2.0-HP3 DSL249D-650-F2.0-HP3 DSL251B-650-F1.95-HP3 DSL251B-NIR-F1.95-HP3 DSL252A-650-F2.0-HP3 DSL253A-650-F2.1-HP3 DSL255A-650-F2.0 DSL255A-NIR-F2.0 DSL259W-660-F1.6 DSL260C-650-F1.8-HP3 DSL261B-655-F2.8 DSL261B-NIR-F2.8 DSL261C-NIR-F2.8 DSL261D-660-F2.8 DSL261E-NIR-F2.8 DSL266A-650-F1.8 DSL266A-NIR-F1.8 DSL300E-NIR-F4.2 DSL311A-650-F2.8 DSL311A-NIR-F2.8 DSL311E-650-F2.8-HP3 DSL313B-650-F2.0 DSL313B-650-F2.0-HP3 DSL313B-650-F2.4-HP3 DSL313B-NIR-F2.0 DSL315B-650-F2.3 DSL315B-650-F2.8 DSL315B-NIR-F2.3 DSL315B-NIR-F2.8 DSL316A-650-F2.0-HP3 DSL316A-NIR-F2.0-HP3 DSL318B-650-F2.4 DSL318B-NIR-F2.4 DSL318D-650-F2.4 DSL318D-NIR-F2.4 DSL318F-650-F2.4 DSL318F-NIR-F2.4 DSL322A-650-F2.0 DSL322A-NIR-F2.0 DSL322C-IRC41-F2.8 DSL330A-680-F2.6 DSL330A-NIR-F2.6 DSL331A-680-F2.0 DSL331A-680-F2.6 DSL331A-NIR-F2.0 DSL331A-NIR-F2.6 DSL331F-650-F2.0 DSL331G-650-F2.0 DSL331G-NIR-F2.0 DSL332A-680-F2.6 DSL332A-NIR-F2.6 DSL332F-660-F1.8-HP3 DSL332F-NIR-F1.8-HP3 DSL333A-650-F2.8 DSL333A-680-F2.8 DSL333A-NIR-F2.8 DSL335A-650-F4.0 DSL335A-NIR-F4.0 DSL345E-700-F1.6 DSL345X-NIR-F1.6 DSL350A-680-F1.44 DSL355A-650-F2.8 DSL355A-NIR-F2.8 DSL364A-700-F1.6 DSL364A-NIR-F1.6 DSL367B-650-F2.1 DSL367B-NIR-F2.1 DSL369B-660-F2.8 DSL369B-NIR-F2.8 DSL377A-650-F2.8 DSL377A-NIR-F2.8 DSL383G-650-F2.0 DSL383G-650-F2.0-HP3 DSL385A-670-F2.8 DSL385A-NIR-F2.8 DSL386A-NIR-F2.8 DSL388B-660-F2.9 DSL388B-NIR-F2.9 DSL392B-650-F2.0 DSL392B-NIR-F2.0 DSL392C-IRC41-F2.0-HP3 DSL397E-700-F1.8 DSL401A-660-F2.8 DSL401A-NIR-F2.8 DSL405A-650-F2.8 DSL405A-NIR-F2.8 DSL415C-650-F2.4 DSL415C-NIR-F2.4 DSL419B-650-F2.0 DSL419B-NIR-F2.0 DSL427E-670-F1.8 DSL427E-NIR-F1.8 DSL428E-670-F1.8 DSL428E-NIR-F1.8 DSL450H-650-F1.4-HP3 DSL450H-NIR-F1.4-HP3 DSL451B-680-F1.46-HP3 DSL452A-650-F1.6 DSL457N-650-F1.6 DSL457N-NIR-F1.6 DSL457P-700-F1.6 DSL457W-700-F1.6 DSL458A-640-F1.8-HP3 DSL458A-NIR-F1.8-HP3 DSL466B-650-F2.6 DSL466B-NIR-F2.6 DSL467S-660-F1.6 DSL467S-NIR-F1.6 DSL477A-660-F1.6 DSL477U-NIR-F1.6 DSL487B-660-F1.6 DSL491A-655-F2.8 DSL491A-NIR-F2.8 DSL491D-655-F2.8 DSL491D-655-F2.8-HP3 DSL491D-NIR-F2.8 DSL591A-650-F2.8 DSL592A-BCG-F2.9 DSL592A-NIR-F2.9 DSL598C-650-F1.8 DSL604A-650-F2.0 DSL604A-NIR-F2.0 DSL606A-670-F2.0 DSL606A-NIR-F2.0 DSL608A-650-F2.0 DSL608A-NIR-F2.0 DSL612A-650-F2.0 DSL612A-NIR-F2.0 DSL618A-650-F1.8 DSL618A-NIR-F1.8 DSL619A-660-F1.8 DSL619A-NIR-F1.8 DSL624A-650-F2.0 DSL624A-NIR-F2.0 DSL660A-660-F2.8 DSL660A-NIR-F2.8 DSL673B-650-F1.8 DSL673B-NIR-F1.8 DSL678F-680-F1.6-HP3 DSL678F-NIR-F1.6-HP3 DSL693A-650-F2.8 DSL693A-NIR-F2.8 DSL695A-650-F3.2 DSL695A-NIR-F3.2 DSL696A-650-F2.8 DSL697A-650-F2.9 DSL746A-650-F2.8 DSL756A-NIR-F2.8 DSL821C-650-F2.8 DSL823A-670-F3.0 DSL829E-650-F4.5 DSL829J-940BP-F3.0 DSL829J-950BP-F3.0 DSL829L-650-F3.0 DSL849A-700-F1.9 DSL851C-NIR-F2.8 DSL853C-650-F2.0 DSL853C-NIR-F2.0 DSL863B-700-F1.8 DSL863B-NIR-F1.8 DSL871F-650-F2.8 DSL871F-NIR-F2.8 DSL871G-NIR-F2.8 DSL893A-BP940-F2.0 DSL900B-NIR-F3.0 DSL900C-NIR-F3.0 DSL900D-650-F3.0 DSL901C-NIR-F3.0 DSL901E-NIR-F3.0 DSL901J-650-F3.0 DSL901J-NIR-F3.0 DSL914A-650-F2.8 DSL934A-650-F3.0 DSL934A-NIR-F3.0 DSL934B-650-F3.0 DSL934B-NIR-F3.0 DSL934C-670-BBAR-F2.0 DSL934C-670-BBAR-F2.5 DSL934C-670-BBAR-F3.0 DSL934D-BP860-F3.0 DSL935A-650-F2.5 DSL935A-650-F3.0 DSL935A-NIR-F3.0 DSL936C-NIR-F3.2 DSL936D-650-F3.2 DSL944B-650-F2.8 DSL944B-NIR-F2.8 DSL944C-650-F2.8 DSL944C-NIR-F2.8 DSL944D-950BP-F2.8 DSL944D-BP940-F2.8 DSL945D-650-F2.5 DSL945D-670-F2.5 DSL945D-BP950-F2.5 DSL945D-NIR-F2.5 DSL946B-700-F1.6 DSL946B-NIR-F1.6 DSL946C-700-F1.6 DSL946C-NIR-F1.6 DSL946D-700-F1.6 DSL946D-NIR-F1.6 DSL946G-700-F1.6 DSL947A-700-F1.6 DSL947B-700-F1.6 DSL947B-NIR-F1.6 DSL947C-700-F1.6 DSL947K-700-F1.6 DSL947S-650-F1.6 DSL947S-650-F1.6-HP3 DSL947S-NIR-F1.6 DSL949A-650-F2.0 DSL949A-NIR-F2.0 DSL952A-650-F2.6 DSL952A-NIR-F2.6 DSL954A-650-F2.2 DSL954A-650-F2.4 DSL954A-650-F2.8 DSL957A-650-1.8 DSL958E-700-F1.7 DSL958E-NIR-F1.7 DSL958G-700-F1.7 DSL958G-700-F2.8 DSL958G-700-F4.0 DSL958G-NIR-F1.7 DSL958G-NIR-F2.8 DSL958R-650-F1.7 DSL965B-BP945-F2.8 DSL965C-BP945-F2.8 DSL965E-NIR-F2.8 DSL967C-BP940-F2.0 DSL973A-650-F2.2-HP3 DSL973A-IRC41-F2.2-HP3 DSL973A-NIR-F2.2-HP3 DSL973B-650-F2.2-HP3 DSL973B-IRC41-F2.2-HP3 DSL973B-NIR-F2.2-HP3 DSL974A-IRC41-F2.4-HP3 DSL974A-IRC41-F2.4-HP3-850 DSL974A-NIR-F2.4-HP3 DSL977A-650-F1.8 DSL977A-650-F1.8-HP3 DSL977A-650-F2.2 DSL977A-NIR-F1.8 DSL978B-650-F1.6 DSL978B-NIR-F1.6 DSL979A-700-F1.8 DSL979A-NIR-F1.8 DSL979A-NIR-F1.8-HP3 DSL986A-650-F1.8-HP3 DSL986A-650-F2.0-HP3 DSL986A-IRC41-F2.0-HP3 DSL986A-NIR-F2.0-HP3 DSL987A-650-F1.8 DSL987A-650-F2.2 DSL988B-650-F1.6 DSL988B-NIR-F1.6