Alex" is somewhat inaccurate in his answer. There is a 135BC and a 135BC Twin Lens Reflex. I am assuming you do NOT have the twin lens reflex version, you will know if you do, it will have TWO lenses on the front of the camera.
But at any rate, yes, the BC stands for black corners. The true, original Holga uses 120 medium format film, and it naturally created vignettes around the corner of the photo. The much smaller film size of 35mm film prevents the vignettes from happening.
Some people want this look though, so the BC model has an internal mask to try to replicate the look of the photos taken with the 120 medium format film models. As far as how you use the camera, there is no difference between the 135 and the 135BC. Frankly, I do NOT like the FAKE vignette of the 135BC, and I think you have the better camera with the standard 135.
Some of my Holga shots done with the 120FN: http://www.lightanon.com/-/lightanon/gal... steve.
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