| Author | Message | ||
     Mndean Tinkerer Username: Mndean Post Number: 61 Registered: 08-2007 Rating: N/A |
Yes, there is something you need to know. The basic thing is this - with a 2.8 lens you are getting roughly half (it's actually a bit less than that) of the light that a 1.9 lens delivers to the viewfinder. Here is a brightness level in f/stops, from brightest to darkest, each roughly halving the amount of light: f/1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16. Each higher number will be 50% darker than the previous lower. Why your Sony looks the same with either lens is likely an electronic trick, boosting the sensitivity levels so you can see at the same brightness no matter what lens is used. I know very little of DSLRs, but it has to be something like that, as optics will determine what a mechanical SLR camera "sees", and there's no way to cheat the physics. Even the electronic camera can't cheat the physics, but it can fool you. |