I need help with a decision. I ordered the 800pf a year ago. I was away in Yellowstone and returned home to find the 800 pf on my doorstep. I currently own the 600 f4 ed fl. I use that on a tripod only. I am a 64 year old woman and don’t have the strength I use to have. Do I sell the 600 and keep the800 or keep the 600 and send the 800 back? I do t know that the weight difference will allow me to handhold the 800. I have never had my hands on the 800, so I don’t know how it feels. I don’t want to open the 800 if I decide to send it back. Any suggestions from this who have both or have experience with both ? Thanks ahead of time.