I bought a Carousel 4600K slide projector on eBay, and it arrived yesterday. There was a BIG problem, though. It came with a regular 4600 instruction manual. The 4600 and 4600K projectors have some differences, making it impossible for me to get the slide tray to rotate once it was in position atop the projector. The main problem was that there was a large plastic tab - maybe 1/4 to 3/8" wide - on the outer rim of the large circle atop the projector indicating the proper position for the tray to be positioned. There was also a corresponding notch on the tray that fit the plastic tab. When they joined up, the tray was immovable on the projector. There was NO WAY that tray was going to move, no matter how many times I clicked the tray advance button. To top things off, the slides wouldn't drop into the slide gate inside the projector. I contacted the seller, and I'm sending the projector back today. I asked several 4600 sellers on eBay how they got the tray to advance, but they had no idea. As a result, I've given up trying to buy a Carousel. But the thought of using a Nikkor 50mm lens as a loupe doesn't appeal to me. What is another good slide projector brand I can consider? Decades ago, I had a Leitz Pradovit, and I loved it. For the most part, they're more than I want to spend now. But if that's my best option, I may go for one. What's a good model to consider? Two questions - what's a good Leitz projector lens?, and do Leitz projector lenses have a tendency to get hazy as they age? When I was considering whether to get back into Leica R series cameras/lenses a while back, my searches on eBay for the R lenses found a fair amount of haze in some of them. So I went heavily into Nikon and never looked back. My Nikkor AI/AIS lenses have all peen perfect optically, thank goodness.