Are there ANY differences whatsoever--in terms of either optical quality or spec ifications--between barrel lenses and the "same" lens that is sold by the manufa cturer ready-made in a shutter?

Is there any risk in having a shutter added to a barrel lens--such as scratching the lens during the changeover "operation", winding up with a less-than-perfect positioning, or anything else?

If you could save a few hundred dollars buying a barrel lens and having a shutte r added, over buying one pre-made in a shutter, would you always get the barrel?

Thank you.