When you have a lens that doesn't fit your camera body, an adapter is the bridge, but picking the right bridge starts with matching mounts, not just price. Two K&F Concept adapters solve two different mounting problems: the FD-L adapter brings Canon FD & FL lenses into Leica L mount camera bodies, while the M42-PK adapter joins classic M42 screw-mount lenses to Pentax K mount bodies. Both are brand-new metal adapters, but they are not interchangeable alternatives.
Quick Verdict
If your lens mount and camera mount are the ones the FD-L adapter was built for-Canon FD & FL to Leica L-then choose the K&F Concept FD-L lens adapter. If your setup is M42 screw-mount to Pentax K/PK, then the K&F Concept M42-PK adapter is the one you want. The decision is driven by compatibility first, with the listed prices as a secondary consideration.
At a Glance
| Adapter | Listed Price | Price Bar | Lens-to-Camera Pairing | Fastening |
|---|---|---|---|---|
| K&F Concept FD-L Adapter | USD 26.99 | Canon FD & FL to Leica L mount | Snap-on | |
| K&F Concept M42-PK Adapter | USD 19.35 | M42 screw mount to Pentax K/PK | Screw-in |
The FD-L adapter is listed at USD 26.99, while the M42-PK adapter is listed at USD 19.35. Both are manual-operation adapters made of metal, according to the descriptions.
Where Each Adapter Wins
K&F Concept FD-L Adapter
This adapter wins if you are moving Canon FD or FL lenses over to a Leica L mount camera body. It is designed for Leica SL, SL2, T, TL, TL2, CL and Panasonic Lumix S5, S1, S1R bodies. The snap-on fastening is easy to attach, and the metal build is based on brass and aluminum. The manual operation means you control focus and exposure yourself, and infinity focus is allowed.
K&F Concept M42-PK Adapter
This adapter wins when you have M42 screw-mount lenses and want to use them on a Pentax K mount camera. It accepts a long list of Pentax K bodies, including the K-7, K-x, K-r, K-5, K-30, K-50, and many more. The screw-in fastening threads directly into the M42 lens, and the metal build uses brass and aluminum as well. It is also manual focus only, with autofocus not available.
Product Notes
K&F CONCEPT FD-L Lens Adapter For Canon FD&FL Lens to Leica L Mount Camera Body
Reach for this adapter if you own Canon FD or FL lenses and your camera body is a Leica L mount model. It opens the door to Leica SL, SL2, T, TL, TL2, CL and compatible Panasonic Lumix S bodies. The snap-on fastening and metal construction are listed in the details. A practical limitation: the camera must be set to manual mode, and you have to enable the "release shutter without lens" option so the FD/FL lens is recognized. Infinity focus is allowed, but you'll be focusing manually.
K&F CONCEPT Lens Adapter for M42 42mm Screw Mount Lens to PK Pentax K Camera
If your lens collection includes M42 screw-mount glass and your body is a Pentax K mount, this adapter is the match. It works with a long list of Pentax K series bodies, from K100D to KP, and uses a screw-in fastening that threads over the lens's 42mm mount. The metal construction is listed in the description. The clear limitation is that autofocus is not available-exposure and focus are adjusted manually, which is expected for this kind of adapter. Infinity focus is allowed.
Final Choice by Use Case
- You have Canon FD/FL lenses and a Leica L mount body: Choose the K&F Concept FD-L Lens Adapter.
- You have M42 screw-mount lenses and a Pentax K mount body: Choose the K&F Concept M42-PK Lens Adapter.
