That's right. A nice, clean Apochromatic Red Dot Artar for sale. Barrel
mount, not in lens. This should be an excellent lens. Glass is clean & clear
and the lens is coated. Aperture is f/9.5 to f/90. Put this in a shutter &
have legendary glass for your LF images. Or, use the 'hat method' of
exposure & live without a shutter.