I've been playing with my new Rokinon 7.5mm f/3.5 fisheye lens and noticed that the Lightroom lens profile for the Sigma 8mm f/3.5 fisheye is perfect for defishing the Rokinon. I haven't had time to shoot anything good yet, but here are a couple snaps to illustrate the before/after. Mouseover/rollover to see the defished version: https://farm9.staticflickr.com/8303/7784608422_054ac3e7a7_b.jpg" rsrc="https://farm9.staticflickr.com/8306/7784610720_231242ac17_b.jpg"> [img]https://farm9.staticflickr.com/8308/7785209874_df2775f873_b.jpg" rsrc="https://farm9.staticflickr.com/8447/7785211392_dccc0db55c_b.jpg"> Without defishing, the detail/resolution is impressive all the way to the corners, even wide open (assuming subject is within the DOF). Defishing will stretch the edges/corners considerably, so you don't get the kind of sharpness you'd get from a good rectilinear lens like the Pana 7-14mm. Still, there's plenty of resolution here for many applications. Depending on the subject, you may want to only partially correct the distortion in order to preserve resolution and angle of view at the expense of perfectly straight lines. Some of the other lens profiles such as the Nikon and Canon fisheye profiles work well for this. Here are the before and after de-fish full-res links (outdoor set was f/8, second f/3.5): [url]https://farm9.staticflickr.com/8303/7784608422_567b503176_o.jpg[/url] [url]https://farm9.staticflickr.com/8306/7784610720_ec03f32b2e_o.jpg[/url] [url]https://farm9.staticflickr.com/8308/7785209874_dcf3b5e940_o.jpg[/url] [url]https://farm9.staticflickr.com/8447/7785211392_6ec451248e_o.jpg[/url] PS - Thanks, Steven, for putting me onto a [URL="https://www.mu-43.com/f89/rokinon-7-5mm-fisheye-239usd-31012/"]great deal[/URL] for this lens in our Deals forum. I never would have considered buying a fisheye, but at this price it seemed like a good buy even for infrequent use.