I am curious as to how to figure out if there is any advantage over one lens vs another when looking at different focal lengths and their minimum focusing distance.
I would like to shoot more butterflies and bees. Using a 90mm macro has its challenges as they don't tend to like you getting that close and flying away and a macro isn't the fastest focusing lens.
I have the Sony 200-600 which will focus at 600mm and 7.87' (2.4 meters). The Sony 100-400 will focus down to 3.22' (.98 meters). So if they are both used at their max focal length which one can have the subject fill the frame more? I can't decide if I want to buy the 100-400 for this purpose, it is redundant to my other gear so if it can't help in this area it isn't worth adding and spending $2,500.
I appreciate the math folks who can help out.