Early Blight or Septoria?

[NathanP]

I'm just trying to identify what is hitting my tomatoes this year. It looks to me closer to Septoria from what I can tell. Any guesses? Sorry the pictures are blurry. The lense cover on my phone makes them look hazy.

Pictures 1 and 2 are from a mix of assorted seeds, some seem to be somewhat resistant.

Pictures 3 and 4 are from Mark Twain, which is getting hit fairly hard, and shows the most dramatic markings on the stems.

Pictures 5 and 6 are from Skykomish (a Tom Wagner offering), which really seem to be getting hammered. Losing all the lower leaves and this is the only tomato line which has not yet begun to set fruit. They only have leaves on the top 12-18 inches of the plants.

I've been removing damaged branches daily. I do not like putting chemicals on my veggies, so I'm just going to try to manage this as best I can otherwise.