Tomato leaf problems look so similar sometimes. But Yellow Spot or Magnesium deficiency look close. Give the plants a dose of Epsom Salts. Add 2 tbls Epson salts to 5 gallons of water and let dissolve for several plants. See if that helps.

If that doesn't help after week or so, it may be a fungus and I've never had much luck stopping that in my humid climate. A copper spray is a decent bet.

Thanks for your opinion. Yeah I believe is some type of fungus. Because it happens to the seedlings as well and i do give them epsom salt. All of my tomatoes get it. Looks like i have so many funguses in the air. Cucumbers and zucchinis get powdery mildew. Tomatoes get that. I will get me one of those organic fungicides and see if it helps.

I wish your plants the best...

I bought some horticultural oil. Will try this out since it is organic.

We will want to know the results.