>>1151666>>1151649Other reasons to use a mirror lens are for artistic purposes. Their bokeh is a round donut shape. You can see examples of that in the backgrounds/foregrounds of the photos in:
>>1146272 >>1146329 >>1147676Another neat feature is the ability to see through/around objects directly in front of the lens. Take this video. It shows the water hydrant and that the lens can focus past it. That's a nice feature when you are in the bush and have scrub you are hiding behind and want to get photos of wildlife without them getting scared off.
