How to find cameras with a button for depth of field preview?

There is an easy answer thanks to my site, Neocamera.

Go to camera search, select the criteria of your choice and activate the button Depth of field preview icon (this looks like opening blades) by clicking on it. For example, if you select SLR and DOF-Preview, you get the set of all DSLRs with a DOF preview feature.

There are currently 37 cameras of this type (Canon, Nikon, Pentax and Sigma), but the link shows live results. Thus, every time you go there, all currently available cameras will be displayed. abandoned models if you are looking for old models).