I’m going to be purchasing a Swarovski STX in the near future and want opinions on the best size objective. I currently have a vortex spotter with an 80mm objective. I’ve read great reviews about the light gathering and crispness of the 95mm objective, but I was wondering if it’s to big to pack around in a backpack? Is there really a big difference between the 85mm and 95mm when it comes to light gathering and edge to edge crispness? Is a 65mm even worth looking into? Would love to hear everyone’s opinions that have experience with any of the different size objectives. Thanks in advance for any responses.