Comparison of Holga HL-N (Mark I) [Top] vs. Holga HL-N (Mark I) + FEL-HL Fisheye for Holga DSLR Add On Lens [Bottom]

 

I would say it doubles the amount of scene in the picture--The web site said 160° coverage on an APS-C DSLR with the FEL-HL adapter + HL-N Lens...