Best low light FF Canon DSLR

Started 3 months ago | Discussions thread
John Sheehy Forum Pro • Posts: 22,009
Re: Best low light FF Canon DSLR

steks wrote:

My thoughts are as followed, if I used a 50mm prime at f/2 with the same shutterspeed I could have taken the picture at ISO 2000. Going to 85mm on a FF sensor (50x1.6=80, but there is no 80mm EF prime) at f/2 (i am aware of the change in DOF) with the same shutterspeed I could have take the picture at ISO 1200 if this sensor would be just as sensitive for light as my APS-C sensor. So far, am I correct and if so is this major part of the gain that can be found in going to FF, or is the sensor it self also more sensitive to light in the range of a stop or more.

80/2 on FF gives about the same angle of view as 50/2 on APS-C, but collects about 2.56x as much light at the same ISO. You have to accept a shallower DOF on the FF to benefit from that. If you want the same DOF as 50/2 on APS-C, you have to use the 80mm on the FF at f/3.2, with no noise benefit to the FF, with ~2.5x the ISO.

Unless you are shooting in Av mode at base ISO without concern for exposure time, a larger sensor only collects more light (when a restricting shutter speed is needed) from your desired composition with a larger lens entrance pupil; 80/2 has 1.7x the diameter and 2.56x the area of 50/2.

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