Is http://shashinki.com/shop/samyang-500mm-telephoto-mirror-lens-samyang-mount-nikon-mount-included-p-5966.html and http://shashinki.com/shop/samyang-500mm-telephoto-preset-lens-samyang-mount-nikon-mount-included-p-5964.html#!tab3 compatible with the Nikon D3100?
См. статью: Samyang lenses on D3100?