There is a new, expotic, and reasonanbly priced lens available, the Lensbaby 5.8mm f/3.5 circular fisheye. It was announced in April for DSLR mounts like Nikon F and Canon EF. In November, it was further announced in Micro Four Thirds mount and Sony E mount.
So, should you buy this lens, and if so, in what mount? That's what I will be trying to answer in this article.
To help the review of the lens, I will be comparing it with a similar lens for Sony E mount, the Yasuhara Madoka 180 7.3mm f/4 (my review). Both lenses are shown below:
Left: Yasuhara Madoka 180 7.3mm f/4 circular fisheye lens. On the right, is the Lensbaby 5.8mm f/3.5 with an adapter for Sony E-mount.