1200mm equivalent bridge camera vs. 300/600mm lens on APS-C? Hey, I currently own a Canon PowerShot SX540 HS and I’m shooting targets from very far away (1km+). The images on the PowerShot turn out alright but how would the stack up against a mid-tier APS-C DSLR with something like a 300mm or 600mm lens? If I were to crop the pictures from the APS-C, how drastic would the differences in sharpness, contras…