Nothing to add about lens choice it's been covered. I live in Northern Kentucky about 20 miles south of Cincinnati. SW Ohio from the Ohio River up the Great Miami River through Dayton Ohio is a migration route for springtime and autumn warblers. Adams County, Portsmouth and Edge of Appalachia are others. I'm sure your tour guide had already scouted out the hotspots and/or has locals on call. If you're in SW Ohio there is a chance I will see you but again there are a lot of areas. I saw, Common Yellowthroat and Yellow Rumps. Another fellow said he saw Pine and Palm warblers but I didn't see them.
One thing to keep in mind, the overwhelming majority of the birds here when you will be here are passing through. They will not be on territory or defending nesting sites. A few nest here (yellow rumps, prothonotary and some others but most are just hanging around here for a couple weeks to fatten up before heading on north to their nesting areas in Canada and the far northern parts of Ohio. Our rivers (Kentucky, Cumberland, Licking, Ohio in Kentucky, Great Miami, Little Miami, Scioto in Ohio) are natural migration routes for many species of birds including various warblers.
Hope you have a great time in our area. It is beautiful in the springtime. Looking forward to seeing your photos.
Jeff
One thing to keep in mind, the overwhelming majority of the birds here when you will be here are passing through. They will not be on territory or defending nesting sites. A few nest here (yellow rumps, prothonotary and some others but most are just hanging around here for a couple weeks to fatten up before heading on north to their nesting areas in Canada and the far northern parts of Ohio. Our rivers (Kentucky, Cumberland, Licking, Ohio in Kentucky, Great Miami, Little Miami, Scioto in Ohio) are natural migration routes for many species of birds including various warblers.
Hope you have a great time in our area. It is beautiful in the springtime. Looking forward to seeing your photos.
Jeff