I tried using the mouse zooming wheel and, at least with my mouse, I still can’t reach exact percentages. I tried zooming in from fit, and zooming out from 100%. I hit zoom percentages such as 78.6%, 50.4%, etc. The reason I’d like to have exact zoom levels is Adobe’s fault. They have stated that in PS, odd percentages zoom levels will not provide a fully accurate representation of the pixels. I have no way of proving or disproving this, but it’s something I’ve always adhered to for the past 20 years of using PS; it makes sense to me! I guess I’ll just use 100% for sharpening and learn to judge final sharpening at that zoom level. That said, I honestly don’t know why Topaz doesn’t offer specific zoom levels when every other piece of image editing software I’m aware of does.