Just saw this... honestly you gotta be careful with the weight if you're walking all day in Japan. Here's a couple options for that R6:

• Canon RF 24-105mm f/4L IS USM: That red ring means it's pro grade. Better for food shots but pricey. Maybe find it used?
• Canon RF 24-240mm f/4-6.3 IS USM: Massive zoom range for buildings but it's a bit of a chonk. Make sure you check the weight before committing tho...

To add to the point above: I have to be honest, I was fairly disappointed with the standard kit lens when I first started out with my R6. Unfortunately, if you go with the cheaper Canon RF 24-105mm f/4-7.1 IS STM, you will likely struggle with those food shots in dim restaurants. The aperture drops off so quickly that your photos end up looking grainier than they should on a nice camera like yours. If you want to avoid fumbling with gear while keeping things reliable, here are my thoughts:

• Look for a used Canon RF 24-105mm f/4L IS USM. You can usually find these for around $850 if you buy from a reputable used site. It is a much more professional piece of equipment and the constant aperture means your settings wont jump around every time you zoom in.
• If you find the zoom lenses are too heavy for walking all day, the Canon RF 35mm f/1.8 IS Macro STM is a very safe alternative. I had issues with prime lenses being restrictive at first, but for food and street buildings, 35mm is honestly great for the price.
• Be careful with the Canon RF 24-240mm f/4-6.3 IS USM. While it has more zoom, the image quality near the corners was not as good as expected for a lens in that price bracket. Basically, dont settle for the bottom-tier glass just to save a few bucks now. Youll just end up frustrated with the results once you get home and see them on a big screen...

Look, you need to be careful with the cheaper 24-105. It gets dark fast when you zoom in, which is gonna be a pain for food shots inside tiny restaurants. The expensive one stays bright the whole time, but it's likely over your budget brand new. Since you want one lens for everything, keep these points in mind:

• Consider the Canon RF 24-240mm f/4-6.3 IS USM. It hits your $900 budget and gives you way more zoom range. Just be warned, it's a bit heavy for all-day walking.
• Try to find a used Canon RF 24-105mm f/4 L IS USM. I would suggest checking shops with warranties so you dont get a dud.
• Avoid the Canon RF 24-105mm f/4-7.1 IS STM. It's okay for daylight, but you'll struggle with grainy photos at night. Seriously, dont skimp too much or you'll regret it once you see your night shots...

Saving this whole thread. So much good info here you guys are awesome.