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Well, that depends on how small you can make your punctured hole.

If you make your shape smaller than 50mm across the effect should work as shown above.ĥ0mm f/2 – shape must be less than 25mm acrossĬan I use this cool trick with my point and shoot? In this case the diameter of the lens aperture is 50mm. 100mm)ĭivide this by the aperture value that is smallest on your lens (e.g. Take the focal length that you wish to use (e.g. The shape you make must be smaller than the aperture in your lens. How do you know how big of a hole to make and what settings to use on any lens? Which is why they are so big and heavy and expensive, and your pre-cut Will be 25mm, so your cutout shape must be less than 25mm in diameterĪ prime lens of 100mm at f/2 will have an aperture diameter of 50mm, In a prime lens of 50mm with an aperture setting of f/2 the aperture The ratio of the focal length to the diameter of the aperture. If we take a “large” aperture, say a value of f/2 – this just expresses

All we have done is supplement the old aperture :) This of course is how a lens works – it is one big aperture with a In real life there is a bit more distance created by a filter, so the size needs to be a bit smallerīecause we are creating a new aperture, it must be smaller than the one inside our lens. The calculations below are based on the assumption that the black card is placed directly on the outer glass. Well, that really depends on the aperture your lens have and on the focal length you are shooting with.