Cheap 420-800mm Telephoto Lens Review: Is the $80 Lens Any Good?

The quick verdict

I paid about $80 for a JINTU 420-800mm lens and took it to New York with my Canon Rebel T7. Some photos were much better than I expected, but keeping the camera steady and getting focus right took work.

I enjoyed trying that much reach for so little money. I would treat it as an experiment for patient shooting in bright light. It would not be my choice for dependable sports or wildlife coverage.

The lens and camera I used

My lens was the fully manual JINTU 420-800mm f/8.3-16. I used the supplied Canon EF adapter on a Rebel T7. There was no autofocus, electronic communication, or stabilization in the lens.

There was also no separate aperture control. The effective f-number changed with zoom, from about f/8.3 at 420mm to f/16 at 800mm. That made the long end demanding when the light dropped.

Match the camera end of the adapter to your own body. A listing that mentions Canon does not mean it fits every Canon mount.

Cheap construction and a long focus throw

The lens was light for its size, but the push and pull zoom felt gritty. The zoom lock did not stop all movement on my copy. I could feel where the low price showed up.

The long focus throw gave me room to make small adjustments. It also meant that finding a distant subject, holding it in the frame, and focusing were separate tasks. This was much slower than using a modern autofocus telephoto.

Handheld at 800mm in New York

I wanted distant details, including the Statue of Liberty, without spending a fortune on a telephoto lens. Unfortunately, I left my tripod plate at the hotel and ended up shooting handheld.

That made the test harder than it needed to be. At 800mm, tiny hand movements became large jumps in the frame. My video was especially shaky. A stable tripod and a correctly supported camera and lens would have helped a lot.

At f/16 I also needed high ISO settings, around ISO 6400 or above in some situations, to keep the shutter speed useful. The reach was impressive, but it did not come with much light.

Some usable photos, plenty of fringing

I got some surprisingly usable photos when focus and shutter speed came together. The lens could show distant details that were tiny in a normal view. That was the part of the experiment I liked.

High contrast edges also showed strong purple and green fringing. I would inspect the full files before deciding whether the result is good enough for a particular subject.

I saw dust or fibers inside my copy and marks in some sky samples. I did not isolate the cause of every mark, so I would not assume that each visible spot came from dust inside the lens.

What I would check before ordering

• The exact 420-800mm version and the included adapter for my camera mount.
• Whether the focus and zoom move smoothly and the lock holds well enough.
• The return terms, especially for a copy with optical or mechanical problems.
• The cost of a suitable tripod or other support if I do not already own one.

The $80 in this review is what I paid at the time. Check the current package separately. I would not pay extra for a listing just because it advertises a very large focal length.

The JINTU reference listing

View the JINTU 420-800mm Canon EF lens listing. This is the link from my original video. Check the current adapter and package against the lens shown there.

I would only consider it after watching the samples and accepting manual focus, weak light gathering at the long end, and the need for steady support.

My verdict

The JINTU surprised me with a few photos I liked, and the reach was fun. Its handling and optical compromises were obvious. I would buy it for a cheap experiment with distant subjects, with realistic expectations about how many attempts it might take.