Holga now is also invented this Fisheye Lens (FEL-HLW). It is designed for non-SLR Digital camera lens only. No additional modification necessary other than simply attach this fisheye lens to your non- SLR Digital camera lens will gives you a vignetting effect just like Holga camera. The angle of view is up to 170 degree which is extraordinarily wide. Producing fantastic images is not a problem in extreme distortion especially in micro and macro photography, the effect is fabulous!