Excerpt: I bought this lens specifically for flower and macro nature photography, but I find it works great for abstract and walk-around photography. Even makes a great little portrait lens. You can get as close as you want or need and still have everything in perfect focus.
Pros: Easily Interchangeable, Fast / accurate auto-focus, Lightweight
Summary: Overall, I love this lens. I would say I'm probably an advanced beginner at photography. I am still using my first DSLR (Nikon D3300) and this was the first lens I bought aside from the two that I got with the camera. 40mm is a great focal length for an all purpose lens.
Excerpt: The main usage of this lens was to combine it with the Nikon ES-1 Slide Copier Adapter in order to transfer slides to digital format. I've only done a few test shots, and it looks like it will work fine. I'm started to find other uses for the lens, so it was a great buy.
Pros: Easily Interchangeable, Lightweight, Strong Construction
Summary: definitely echoing the others here. This was a well researched purchase and I am not one bit disappointed. The clarity vs the stock lens from my D5200 is incredible. Its really hard to take a bad picture with this lens, and is great for macro photography.
Summary: This lens is a great piece of glass if you're looking to upgrade from the kit lens but it isn't without flaws. It takes very sharp and almost crystal clear images especially when shooting macro. It can easily double as a great portrait lens if needed as well.