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Northern Germany, Lower Saxony, Celle, Sept. 14th 2021
Hi out there, a few day ago, I went for a walk and took my camera with me. Alongside a forest road there were a lot of Solidago aka goldenrod. On these flowers I got many insects, especially Syrphidae, taking a bath in pollen. A few I could identify by my self, for some I need confirmation (or refuse if I'm wrong) and some I didn't know at all what species I got, can you help out?

4th, this female for me looks similar to Syritta pipiens, but again far away to be sure
2nd pic eventually could be another individual, so it even can be another species (cleaning the proboscis, has a nice green haltere)
Thanks for your help, have a nice day, Norbert