Compared to regular pentagonal aperture, what effect does the image have if you use the aperture of the shape below?
The above aperture has a pentagonal shape and has a protruding part to the side.
How can you analyze the impact on the extra part?
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The only way to know the effect of aperture shape is make a picture, then look at it.
With practice, you may have enough experience to make accurate predictions before making the picture, but “try it and see” experiments will always be necessary.
Experiment is part of photography and most experiments fail. The aperture shape will always have some effect on the picture. Usually it will not be the effect you want.
Fortunately, unsuccessful pictures are not crimes and for better or worse few people will care one way or the other.
Making pictures to find out is almost always better than guessing while sitting in a chair. Even with film, making pictures doesn’t cost much and ends whatever worry kept you from it.