#17. "RE: Very Basic Flash Question, please help" In response to In response to 15 Mon 10-Dec-12 09:39 PM by Kropotkin
Thanks for the compliments!
On my D7000 I assigned the function button to flash lock. (Custom Settings Menu... Controls... f3). The function button on the D7000 is on the left hand side of the lens mount, looking at the camera.
The reason to use it is in TTL mode the exposure is always taken in the centre of the frame. So; if the subject is not in the centre the subject will not be correctly exposed by the TTL system. (TTL-BL is different but for Lynn's case, shooting indoors TTL is probably the right choice anyway. Russell has an excellent explanation of all this in his Nikon Practical Guide; that's where I learned it from; http://tinyurl.com/cz5y3qs).
Flash lock is just like AE lock. You point the camera at the subject. Press the function button. A pre-flash fires and measures exposure. Re-compose. Shoot. The flash will expose for the off-centre subject.
Take care to press the function button again to cancel flash lock as it stays on until you do. There is a little icon to indicate that it is on.