Vintage-lens owners face a simple but annoying problem: the glass you already like does not fit the camera you now shoot. These four camera accessory adapter options solve that in different ways. One is a filter-thread step-up ring; the others are lens-mount adapters for Canon FD glass, M42 screw-mount glass, and Canon FD/FL glass on Leica L bodies. The main selection question is not price alone-it is which mount you are connecting.
The quick take
If you need to step a 58mm lens thread up to a larger filter size, the ICE 58mm to 77mm Step Up Ring is the direct solution. If you are adapting lenses, match the adapter to your camera body first. The K&F Concept FD-EOS adapter covers Canon FD lenses on Canon EOS EF/EF-S cameras and includes an optic glass element. The K&F Concept M42-to-Pentax K adapter fits M42 screw-mount lenses on Pentax K/PK bodies. The K&F Concept FD-L adapter sends Canon FD and FL lenses to Leica L mount bodies and compatible Panasonic L-mount models.
Listed price comparison
| Adapter | Listed Price | Price Bar | What It Does |
|---|---|---|---|
| ICE 58mm to 77mm Step Up Ring | USD 7.95 | Converts a 58mm lens filter thread to a 77mm female thread for larger filters. | |
| K&F Concept M42 to PK Pentax K Adapter | USD 19.35 | Mounts M42 screw-mount lenses on Pentax K/PK camera bodies. | |
| K&F Concept FD-L Adapter for Leica L Mount | USD 26.99 | Mounts Canon FD/FL lenses on Leica L mount bodies. | |
| K&F Concept FD-EOS Adapter | USD 35.19 | Mounts Canon FD/FL lenses on Canon EOS EF/EF-S bodies. |
The price spread here runs from USD 7.95 to USD 35.19. That range tracks the different jobs: the step-up ring is a metal thread changer, while the FD-EOS adapter is built for a wider EOS body family.
Decision matrix
| Need | Choose | Why |
|---|---|---|
| Use 77mm filters on a 58mm lens | ICE 58mm to 77mm Step Up Ring | Direct screw-in thread conversion from 58mm male to 77mm female. |
| Canon FD/FL lenses on an EOS EF/EF-S body | K&F Concept FD-EOS Adapter | Built for Canon FD/FL lenses and compatible with many EOS DSLR bodies. |
| M42 screw-mount lenses on Pentax K/PK | K&F Concept M42 to PK Pentax K Adapter | Brass/aluminum build with broad Pentax K body compatibility. |
| Canon FD/FL lenses on Leica L mount | K&F Concept FD-L Adapter for Leica L Mount | Snap-on mount built for Leica L mount bodies. |
Product notes
ICE 58mm to 77mm Step-Up Ring
This is the adapter to choose when the bottleneck is filter size, not mount fit. It gives a lens with a 58mm filter thread a 77mm female thread on the front, so you can use larger filters without buying a second filter set in a smaller size. The aluminum-alloy build is the useful part here: it is a screw-in ring, not a body-mount adapter, and it does not add any glass. The limitation is equally clear. It will not connect an old lens to a different camera body, and it does nothing for mount compatibility. If you are trying to solve an FD-to-EOS or M42-to-Pentax problem, this ring will not help. It earns its place only in the filter-thread workflow.
K&F Concept FD-EOS Adapter with Optic Glass
The strongest argument for this adapter is compatibility plus a built-in optical element. It mounts Canon FD and FL 35mm SLR lenses onto Canon EOS EF/EF-S bodies, and the optic glass in the adapter keeps infinity focus in reach. The compatible camera list spans many EOS DSLRs, from Rebel and xxxD bodies through 5D and 7D lines. The trade-off is the top-of-range price in this group. For a shooter moving from older FD-era glass to an EF/EF-S body, it removes the need to replace the lens collection first.
K&F Concept M42-to-Pentax K Adapter
Choose this adapter when the lens collection is M42 screw mount and the body is Pentax K/PK. It supports Pentax K-mount DSLRs such as the K-7, K-x, K-r, K-5, K-3, K-S1, and others, and the brass/aluminum build gives a solid seat for the 42mm screw thread. The limitation is the manual-only control path: Auto Focus is No, and exposure and focus are set by hand. If you rely on auto focus or auto exposure, this adapter will not add those functions. For a manual shooter with M42 glass and a Pentax K body, it is a direct fit.
K&F Concept FD-L Adapter for Leica L Mount
This adapter is the narrowest in scope but exactly right for a Canon FD/FL lens on a Leica L mount body. It covers Leica SL, SL2, T, TL, TL2, and CL bodies, and it also works with Panasonic L-mount bodies such as the Lumix S5, S1, and S1R. The metal build uses snap-on fastening, and the body needs to be in manual mode before the adapter can be used. The first use also requires enabling the 'Release shutter without lens' option before the shutter can be released. If you already shoot L mount and own FD/FL glass, this adapter is the specific bridge you need.
Which one should you pick?
Pick by mount first, then price and feature set. If all you need is a larger filter thread, choose the ICE 58mm to 77mm step-up ring at the low end of the price range. If you shoot M42 lenses on a Pentax K/PK body, the K&F Concept M42-to-PK adapter is the direct match. If you are moving Canon FD or FL glass to a Canon EOS EF/EF-S body, the K&F Concept FD-EOS adapter with optic glass is the one that also keeps infinity focus within reach. If your body is Leica L mount or a compatible Panasonic L-mount body, the K&F Concept FD-L adapter is the targeted solution. Use the adapter that matches the mount you actually use, and the older glass gets a second life.
