This was kind of obvious but still unexpected to me. Trying to use the D700 flash when a big lense such as the 24-70 F2.8 is mounted causes the lense to cast a huge shadow that takes-up a large half circle at the bottom of the image, making the D700 flash totally useless.
Now my question is, if I mount a SB600 on the D700, will the lense still cast a visible shadow? Is the D700 flash still comes on or only the SB600 will come-on? And if the D700 flash comes-on along with the SB600, will the lense shadow still be visible?