Can't speak highly enough of the Topaz products. I was using the Sharpen AI program on some "panning" shots. (I am NOT very good at all with panning shots.) Anyway, I was trying to sharpen the images and the first pass produced some weird results as the subject was sharpened but the background was UGLY! I used the masking feature in the program and lo and behold, the subject sharpened and the background stayed blurry! Take a look at the lettering on the pant leg.

I am now going to spend more time practicing the technique knowing I can tweak the results if need be. These two images are the before and after. Not great images on their own merits, but a good example of what can be done!

Schneider made view camera lenses. They had a 150mm Componon lens that was sold as an enlarger lens and another to go onto the flat board of a view camera. The one made for enlargers, the front and rear cells screwed into a no. 0 shutter. Other than the 'enlarger' lens version being a far sharper lens with the same circle of covering power, the rear cell had a threaded ring so as to mount the lens to a standard enlarger lens board. Take a wild guess which of the two lenses I used for years on both the view camera and the enlarger? Why any one would buy two lenses when one would do what you wanted is beyond me.

By the by, general camera lenses are NOT designed to be used at infinity, they produce their best results at 6 to 8 feet from the subject. Lenses designed to be used at infinity are aero lenses.