Hey my dad still has one of these.....Zenit is an excellent brand! Don't underestimate the (once) front runner on space industry optics :) In fact, not so long ago I bought an 16mm 2.8 MC Zenitar fisheye lens, which came with 4 screw in filters. Awesome stuff....superb optics. Just look at this silly shot I made a short time ago. So don't let the looks fool you ;)