I normally use my Sony Nex cameras for my legacy manual focus lenses because of the focus peaking function the cameras provide, which is the best implemented at the time of this post. Just my opinion of course. However Olympus and Panasonic have now introduced focus peaking into their systems and Fuji have upgraded their camera firmware which enables focus peaking. I haven't used the Olympus or Panasonic systems yet but I do have a Fujifilm XE-1 and I can tell you the focus peaking function is not my cup of tea. Only white is available and I find it really difficult to see while trying to manual focus. I wish they would provide more colours which would make it easier to see. White is just too common a colour for this and I tend to use yellow on my Nex systems. It really does stand out especially if I set the value to high.
Sometimes though, I like to use AF with the E system lenses and I tend to use the long end of every zoom I use. The 55-210 f4.5-6.3 was the only one I considered because it's cheap and pretty small. The keep the size of the lens small, they had to make the lens pretty slow. The fastest aperture available if f4.5 which is pretty slow and that's at the wide end. At 210mm you are at f6.3 which means this lens was not designed for low light hand held work. On a tripod you might be fine but I only use this lens when the light is good because most of my photography is done hand held. One thing it's got going for it is OSS which does really help me. I'm not as young as I was and I find these stabalization systems pretty good overall.
Sometimes though, I like to use AF with the E system lenses and I tend to use the long end of every zoom I use. The 55-210 f4.5-6.3 was the only one I considered because it's cheap and pretty small. The keep the size of the lens small, they had to make the lens pretty slow. The fastest aperture available if f4.5 which is pretty slow and that's at the wide end. At 210mm you are at f6.3 which means this lens was not designed for low light hand held work. On a tripod you might be fine but I only use this lens when the light is good because most of my photography is done hand held. One thing it's got going for it is OSS which does really help me. I'm not as young as I was and I find these stabalization systems pretty good overall.