I am not sure if this is true or not either but it seemed as if i had better sucess with certian jobs of mobs... When i was on brd/whm and me and ilana on rdm/blm went to go take pictures of corses i went 0-6 and she went 2-3. I was using Hq camera she was using regular. Then we went and took some pictures of soulflayers where i went 7-12 and she went 0-6. She didnt wanna buy a third camera and i still had 24 shots left so i had the brilliant idea to go take pictures of fomors in Lufaise meadows up by the birds. Took 12 pictures of fomor nin with 8 captures (still didnt get the one i saw in someones bazaar for 100k tho) and then i saw the fomor mnk and went 1-10 on fomor mnk. And 2 for 2 on abraxas (sp).
Its probably coincidence but they were some pretty significant swings so i think there may be something to it. Also all of my pictures were taken in first person view with the mob looking directly at me.. sleeping most of the time cept for the fomors.
If anyone can come up with a reasonable explain for these swings please share.