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First let me say the tour is out of Cutler, Maine not Camden. Several hours apart. The last week of July and the first week of August should be fine. The birds are gone by the middle of August. In fact , I'm booked on the last Friday in July.
I went earlier last year, June 30th and July 15th. On the 15th the birds just started to have food in their mouths. By late July and early August they will be feeding the little ones full time.
Here is a link to some of the shots from last year:
Send me a PM if you need more info.