Articles
How lens mounts work, and what that means for the lenses you already own. Every figure traces back to the same mount data as the compatibility matrix.
Why you can't put mirrorless lenses on a DSLR
Mirrorless lenses sit 16–20 mm from the sensor; DSLR mounts hold lenses 38.67–46.5 mm away. Why that gap can't be bridged, and the rare exceptions.
Using vintage manual lenses on a mirrorless camera
M42, Canon FD, Nikon F, Pentax K and Leica M lenses adapt easily to mirrorless. How to focus them, set the aperture, and avoid adapters that miss infinity.
Speed boosters vs plain adapters: what the glass does
A speed booster is an adapter with glass inside: a wider view and about a stop more light, but only onto a smaller sensor. How it differs from a plain ring.
Autofocus with adapted lenses: what actually works
Which adapters keep autofocus, which only manage single-shot AF, and why screw-drive lenses stop focusing. A tier-by-tier guide to adapted-lens AF.
Canon EF-M is discontinued: what to do with your lenses
Canon ended EOS M in 2023, and EF-M lenses cannot be adapted to Canon RF. The realistic options: keep shooting, sell, or build around EF lenses that move to RF.
Fujifilm G mount vs X mount: what's the difference?
Fujifilm X is APS-C at 17.70 mm; G (GFX) is medium format at 26.70 mm. Why XF and GF lenses never cross over, and what adapts onto each system instead.
What is the L-Mount Alliance, and which lenses fit L-Mount?
The L-Mount Alliance lets Leica, Panasonic, Sigma and eight other makers share one lens mount. Who is in it in 2026, which bodies and lenses fit, what adapts.
Flange focal distance: why some lenses adapt and others never do
What flange focal distance is, why a lens only adapts to a body with a shorter one, and a table of every mount's figure, including Leica M at 27.80 mm.