Linhof Technar 65 Viewfinder w/ 6x9 mask brand_Dracast 5 DC HSM is an

5 DC HSM is an ultrawide lens for Canon EF mount crop sensor digital cameras

Sharp as heck

used in Ricoh GR compact cameras

The Sony FE 24mm f1

But its unique formats and compact size might make it worth the trouble

Linhof Technar 65 Viewfinder w/ 6x9 mask brand_Dracast 5 DC HSM is anThis Linhof viewfinder was designed for the Linhof Technar camera, but it can be used for any 6x9 camera with a 65mm lens (there are a few!) The mounting shoe is the slightly nonstandard Linhof configuration, but it will fit in many ISO shoes with a bit of extra overhang. In excellent condition, with light wear. These viewfinders have interchangeable masks for different formats, but only the 6x9cm mask is included.