Blog category URLs

Hey guys, let's say i run blog about photo gear and i want to create these categories:

Nikon (nikon/lenses/blog-post)
- Lenses
- Flashes
- Whatever

Canon (canon/lenses/blog-post)
- Lenses
- Flashes
- Whatever

Does those same URL hurt SEO or are something like duplicated something?

Btw, the categories are with noindex.