Paris is very friendly, especially toward visiting photographers.
Travel as lightly as you can. Leave the 20x24 at home. Have fun.
A gendarme helped me make a photo of the Arc de Triomphe, at night. It was all dressed up for Armistice Day. 4x5, a tripod, long exposure. Open the shutter, close it till the cars pass, open the shutter. From the middle of the Champs ElysÈes. But I wanted the photo. Gendarme saw me, came out to see how drunk I was (not, yet ). He politely inquired if I was suicidal (not yet). I explained my grandfather had fought in WW1, and had been wounded. Whereupon, gendarme began directing traffic around me. Got the shot, a big hug and a salute. Even caught the last Metro to where I was staying. Went into a cafe, and a waiter asked if he could practise his english with me, he was going on vacation to texas. OK, even for a Paris lover like me, this had become a completely surreal night. But it can happen, that's what it's there for.
Bvd de Beaumarchais, photo shops. The flea markets, also. Have fun.
Blow off Notre Dame. Go to Sainte Chapelle. For real, no tripods inside, or flash. Tri X and a 2.8 lens= heaven.
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