u/Low-Inspector1852

I recently dug up two old lenses from my ancient Rebel XT (350D) in the attic:

• Canon EF-S 18-55mm f/3.5-5.6 (old kit lens)
• Canon EF 55-200mm f/4.5-5.6 II USM (ultrasonic autofocus)

I'm planning an upcoming trip to Japan and also want to take some great photos of our dog. My total budget is €600.

My plan: Buy a refurbished Canon EOS R50 (body only, ~€450) and an EF-EOS R adapter (~€50-80) to reuse these lenses.

I’m wondering if this is a solid plan or a technical bottleneck. I'd love your advice on a few things:

1. Image Quality: Are these 2005 lenses optically "good enough" for the modern 24MP sensor of the R50, or will they severely bottleneck the image quality and sharpness?
2. No Image Stabilization (IS): Neither the lenses nor the R50 body have image stabilization. Is shooting at 200mm handheld during the day going to be a blurry nightmare, or is it perfectly doable by just keeping the shutter speed high?
3. Autofocus for a Dog: Will the R50's advanced subject-tracking AF actually play nice and fast enough with the old USM motor of the 55-200mm to capture a running dog?
4. The Alternative: Is this adapter setup a clever budget hack, or should I just save up a bit more for the R50 with the modern native RF-S kit lenses?

Thanks in advance for your help and expertise!

* **(1) Budget, country, and currency:** €600, Netherlands, EUR.
* **(2) What equipment, if any, you have now and why is it no longer meeting your needs?** 
I currently have a Canon Rebel XT (350D) from 2005 with a Canon EF-S 18-55mm f/3.5-5.6 and a Canon EF 55-200mm f/4.5-5.6 II USM lens. The 20-year-old camera body is completely outdated (terrible autofocus by modern standards, poor low-light performance, and low resolution), but the lenses still function perfectly. I'm trying to figure out if it's worth adapting them to a newer body.
* **(3) What kinds of subjects do you intend to shoot?** 
Travel/city/landscape photography (for an upcoming trip to Japan) and action/portraits of our dog.
* **(4) Is it primarily for photography, videography, or both?** 
Primarily photography.

First time in Japan, 2 weeks total (Aug 8-21): Tokyo (4 nights) → Takayama (2 nights) → Kyoto (4 nights) → Osaka (2 nights) → Tokyo (1 night).

We've got 2 nights in Takayama, including a day trip to Shirakawa-go. But the travel time is pretty brutal with around 4.5 hours from Tokyo, then another few hours to get to Kyoto after.

Given we only have 2 weeks total, is Takayama worth the travel time and the 2 nights? Or would we be better off cutting it and spending that time elsewhere?

Open to hearing both sides!

EDIT: Thank you for all the replies. Im gonna take it all into account!

For the last month I've been working on a web app on Google Ai Studio and it has done a really good job. But since this morning I've noticed that it has become really stupid. It keeps ignoring simple instruction where I need to constantly repeat my instruction. Sometimes it just completely ignores my new prompt and gives me a summary of what it has done from previous instructions.