So I have a day shooting on Saturday at Knowsley Safari Park. It's a Safari Photography Masterclass. They suggest a zoom up to 300 mm as well as shorter focal lengths for some of the exhibits. So as it's going to be a long day, I'm trying to decide what gear to take. I'm fine on the shorter stuff, but it kind of got me thinking about what to use for my best reach. Gear I have D750 D7100 70-200 mm f2.8 70-300 mm 4.5-5.6 2 x TC (which doesn't fit the 70-300). So obviously the cropped sensor D7100 with the 70-200 mm combined with the TC will give me the longest reach, but what is going to give me the best compromise of reach and IQ? So I rather hurriedly took some snaps of a bird feeder this evening with my various options. These are all rather dull and un-edited, but may help get some feedback. All shot at maximum zoom.