Most photographers who still own Canon FD or FL 35mm SLR lenses eventually face the same mount mismatch: the lens fits the old body but not the new one. In the camera accessories adapters category, the K&F CONCEPT FD-EOS Canon FD Lenses to Canon EOS EF Lens Adapter w/ Optic Glass is one practical way to bridge that gap.
Quick verdict
At USD 35.19, this K&F CONCEPT adapter makes it possible to place Canon FD and FL 35mm SLR lenses on Canon EOS EF/EF-S mount SLR cameras. The catch: the operation is manual control, manual focus, and manual exposure, so it suits someone who wants old glass on a new body without expecting autofocus or autoexposure.
Who it suits
This adapter is a good fit for photographers with a collection of Canon FD or FL 35mm lenses who now shoot on an EOS SLR and do not rely on autofocus. It is also appealing to anyone who wants to experiment with adapted lenses as a creative way to get a different look from legacy glass.
What stands out from the listed details
The adapter is built from brass and aluminum, includes optic glass, and supports infinity focus. The compatibility list covers a wide range of EF/EF-S SLRs, from earlier EOS models such as the 300D, 350D, and 400D through the 5D Mark II, 5D Mark III, 7D Mark II, and many Rebel T-series cameras. The listing also stresses that the adapter is made for FD mount lenses, not for EF mount lenses.
The adapter at a glance
K&F CONCEPT FD-EOS Canon FD Lenses to Canon EOS EF Lens Adapter w/ Optic Glass

The adapter is a direct bridge for FD and FL 35mm lenses going onto EOS EF/EF-S SLRs. Its strong points are the metal construction, optic glass, and broad compatibility list. Its limitation is that it is intended for FD mount lenses only; if your lens is an EF mount, this is the wrong adapter for your setup.
Meaningful trade-offs
The main trade-off is a fully manual shooting experience: because the adapter supports manual control, manual focus, and manual exposure, you will set aperture, focus, and exposure yourself. Infinity focus is supported, but you have to align the ∞ mark and the L-shaped shift range to get a distant subject sharp. That is not an automatic process.
Bottom line
At USD 35.19, the K&F CONCEPT FD-EOS adapter is a practical way to reuse Canon FD glass on an EOS body. It is a good match for photographers who like to be in full control of focus and exposure and for anyone who wants to keep legacy lenses in active use.