I'm kind of interested in getting a fisheye lens for my 4/3 and m4/3 gear, but I don't feel like spending tons of money for one. Yes, there's the Rokinon/Samyang/etc. 7.5mm but I don't like presetting the aperture. I have an adapted 50mm f1.7 Rokkor that I've used on a few occasions so I'm not merely predicting that I won't like it...I've experienced the procedure and I know I won't. I got to wondering about the "auxiliary fisheye lens" attachments, which are really filters I guess. I know that the more glass you put in front of a lens, the more you degrade the image. But I've had great luck with my Raynox closeup lenses, which also add glass between subject and sensor. I know some like no glass solutions like extension tubes but I can just unclip (not even unscrew) the Raynox and get back infinity focus. The AF works either way. Despite the extra glass, the images are sharp, so there are at least some exceptions to the rule. Something like that, only fisheye, would be great. So what is the deal with the auxiliary fisheyes? Raynox makes yet their website doesn't recommend them for DSLRs---they're for video cameras. Of course other brands make them and I'm sure most are total junk, but I think if anybody could do it, Raynox would. The few reviews that I could find on amazon and elsewhere seem to indicate that a fisheye attachment intended for a video camera can't focus when added to a DSLR lens. Is it something along the lines of using a lens designed for a shorter flange-to-sensor distance?