Lens hood for Konica IIIA. Rectangular or round

[biplanepilot]

Is the original lens hood for this camera rectangular or round? I bought a round screw-in one on eBay but it vignettes slightly. I see many rectangular clamp-on Konihood lens hoods but none fit the outside diameter of the 50mm f1.8 lens which is 46mm

 

[shawn]

Is the original lens hood for this camera rectangular or round? I bought a round screw-in one on eBay but it vignettes slightly. I see many rectangular clamp-on Konihood lens hoods but none fit the outside diameter of the 50mm f1.8 lens which is 46mm