Hi,
I'm brand new to large format photography and am looking at camera options. In the description of a Chinese rangefinder camera vendor, there is mention of a "Lens Knife." Googling the term doesn't lead to results. I gather it's a metal piece that matches the focus and/or field of view of the rangefinder camera to the lens as the bellows is adjusted. Since there is nothing on Google I'm guessing that "lens knife" is possibly not the correct term. Does above description sound familiar to anyone? Is there a different name? Is this something one has to make or have made for each focal lenght lens?
Thank you for any feedback!