@ #2: the signet is a bit to complex. I found it hard to understand the "W" and "T" thing. The target-idea is in general a good one. maybe you can work a bit in this direction.
@ #3: although the emblem is quite nice, it doesn't really fit to the camera theme
@ colors: yes, green is mandatory. But a combination with other colors is absolutely fine.
Thanks for reviewing my designs. I do really appreciate it. Here are some update versions for your consuderation (#4, #5, #6, #7, #8, #9 & #10). Please let me know for any revision request needed.