got to the top of a local mountain (Mt Helix) just at sunset. Set up and couldn't see anything. Another person with binoculars found it first. Once he showed me; I could barely see it through my 100-400. I focused using liveview on my 1Dmk iv.
Here are 2 samples. 1 zoomed in, and one wide angle. The planes were in all my shots!!




At least you can TELL this is a comet. The ISS flying so fast and totally silent IS something that's cool to see/experience.... But I like these better. 
