It is correct that the funstar has no lens. Imagine a hyperstar with all lens(s) taken out. That is the funstar and why the funstar is so inexpensive. All it does is let you mount your camera at the native focal plane of the primary mirror of the SCT which has an F2 mirror. But the resulting image will have lots of uncorrected aberrations. The purpose of the lens(s) in the hyperstar is to correct for these aberrations. You could have fun, though, in looking at some targets (like fuzzy blobs) that don't look that different with the aberrations. Imagers would not be happy, though, with the results. If you already have the hyperstar, you have no need to get the funstar. If you can't afford the hyperstar, the funstar could be an option if you accept that the image quality will be poor.