Minolta RF Rokkor 500mm 1:8 mirror-lens

Minolta introduced the RF-Rokkor to the market in 1978. Due to the mirrors built in to geometrically shorten the lens, blur points are imaged as rings - the "donuts" often referred to as such. Depending on the shooting situation, the donuts are imaged more or less. In some of the example images, the donuts are clearly visible.

Camera: Sony A7 III (24 Megapixel)