In a bundle of goods from ebay the other day a 'King Deluxe Video Semi-Fisheye' was included. It is a 'Filter' in that it has a 52mm screw thread to fit on the filter threads of a video camera lens. It comes in two parts - the Fishy part and a Macro part - says series VII Made in Japan on the side. I have yet to try it for real to explore its creativity. It has an odd loose collar on the front which spins and moves forward and backward. i guess for this wide angle that is about as deep a "hood' as it allows without vignetting and it has enough thread in it to be able to screw on a 76mm or so filter.
I tried it first mounted on a K55 f1.8 on a SFX but the effect wasnt so strong on a 55mm. (Please correct me if I just failed to see something) Then on a Spotmatic 28mm F2.8 Tokina and it gave a perfectly round image in the view finder. On the cropped digital sensor of my DL2 it gave the following result - near 180 degree angle of view of the street, taken from balcony, going past my house in a rural country town. The red is not a hue - that is the colour of the dust and dirt. Apart from resizing this image is un retouched.
It seems like it has had a polariser on it but this is just the effect of that thick piece of glass on the front. I am looking forward to playing. In the full size the image is really badly diffused at the edges with some blue and yellow colour shift and blurryness - but maybe that is part of the attraction.
Slightly off topic but while I am writing about adding stuff to the front of lenses, also thrown in the job lot was a Cokin A series filter holder with 52mm filter ring adapter and a funky piece of moulded perspex with heaps of facets and a hole drilled though it. The filter makes this kind of image for when I get tired of fish eyes.
I have since added a Cokin tobacco grad filter to play with some of the sunsets. Wanted a Neutral Density but none available around here and the item was 50% reduced from a real shop.