[kkwy2000]

是否所有鏡頭(EF/EF-S)用係CANON-7D都要除"1.6".
例如"EF-S 15-85mm f/3.5-5.6 IS USM" 視角(對角)係84.30'-18.25'.咁除"1.6"之後就只有52.69'-11.41'?!
例如"EF 24-70mm f/2.8L USM"視角(對角)84-34.咁除"1.6"之後就只有52.5'-21.25'?!
Thank you ching......

[ACanonGuy]

Since EF-S lenses are compatible with APS-C camera bodies only, the published angle of view should be for APS-C already so it doesn't need to be factored again. Here is the full lens chart"

http://www.usa.canon.com/app/pdf/lens/Lens_Extender_chart_new.pdf

[kkwy2000]

Thank you ching. Then, if i use other manufacturer's lens, it is same cases?

[ACanonGuy]

Not sure about other manufacturer's lens. I assume they publish similar information.

[o_sing_o]

e.....咁點EF 17-40mm f/4L USM同EF-S 17-55mm f/2.8 IS USM放係APS-C個廣角端視角唔同既, 一個係65°54', 一個係78°30', 唔通EF鏡同EF-S鏡既計法真係有唔同???