TidyFactPractical calculators, checked factsCamera tools
Camera tools that work anywhere: crop factor and equivalent focal length, Fujifilm film simulations by camera, and lens adapter compatibility. Every number cites a maker's source.
Lenses and formats
Crop Factor and Equivalent Focal Length
Pick a sensor format and move the focal length and aperture sliders to get the crop factor, equivalent focal length, equivalent aperture and angle of view at once. A simulated view, an aperture iris and a same-scale size chart show the difference.
Lens Adapter Compatibility Chart
Pick a lens mount and a body mount to see at once whether it can adapt, how thick the adapter must be, which OEM and third-party adapters exist, and whether autofocus works, with a to-scale side view of the lens going on.