For film based telecovertors, i heard that there is a drop in stops of light i.e. if i use a 2X tele convertor, my effective aperature will drop by 1 stop. wondered is it true that if a 2X TC is used it will drop by 1 stops. If a 1.4 X TC it will drop by 1/2 stop? Since "F stop=(focal length/diameter of opening of lens)"
How about those convertors used in digital cameras, which is installed at the front of the lens. Do they exhibit the same phenomema?
How about wide angle convertors? do they increase the amount of light? ( quite lame right? having more elements will increase light? )