ahsanford said:aceflibble said:An easy way to think of it is like creatively shaping out of focus highlights. You know how you can make them take on shapes like hearts, cross, or stars, or even words, by placing a stencil of the shape at the front of the lens, and the in-focus parts of the image remain unaffected?ahsanford said:Can someone run me through the clipped bokeh ball mirror box comments I've been seeing? What's that all about?
Ah, this I can relate to as I've fiddled with those bokeh templates in front of the lens before. But those work by defining a profile that is slightly narrower than the lens aperture -- it's effectively commandeering the bokeh shape by edict. Are you saying the mirror box is... narrower in physical width than the opening in the lens blades at time of exposure?
See sample shot here from another thread (first one with the Christmas tree):
www.canonrumors.com/forum/index.php?topic=33869.msg696463#msg696463
Is the mirror box effect the blunting of the bokeh balls on the right hand side of the frame, or is it the oval-ing of the balls up top? Will this happen all the time when shooting wide open or just in certain circumstances? Is this a common phenomenon for wide aperture primes? I've honestly never heard this discussed before!
- A
The cat-eye shape is physical vignetting from the front lens (most probably) being too small to make the entire aperture visible at all imaged angles.
The straight cuts in the bokeh balls are from the mirror box doing the same from the sensor side.
On the 50/1.0L you additionally get an image of the lens contacts, as those are glued (iirc) to the rear element.
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