yes
ifNikon d90 digital slr camera on auto mode can we use flesh sb600 on this mode or only manual mode
Yes in non i-ttl auto and manual
yeah ... it will work on the newer cameras. However, you are better off with a sb400/600/800 or the better 900. They camera will auto detect the settings of these new lense ... vs. you messing around with settings.
Yes it does with non i-ttl auto (2 different f stops) and manual.
nikon or keh
Yes it will. It will work in auto and manual modes. TTL does not work.
When using a Nikon 42x P510 camera it is very easy to slow down the shutter speed. On the side of the camera there is a dial that you can access to slow or speed up the shutter speed.
They are not.The exposure meter won't work with the ais lenses. They will work fine if you get the exposure right from trial and error, use a light meter, use experience or meter with another lens first though.
the current nikon speedlight range is thus: SB-200 SB-600 SB-800 SB-900 All will work with the Nikon D300s Older speedlights will also work, but without i-ttl mode.
Yes in non i-ttl auto and manual
Hypothetically, yes. The speed of light is relative to the observer, so no matter how fast one is traveling, light always appears to travel at the same speed.
Probably not in five lifetimes! Light speed travel is a work of fiction, like in sci fi movies. No human will ever travel at the speed of light.