Is there a difference in the opening between the lenses?

Happy holidays.

I thought too new.  I'll start with what is probably a false assumption.  Suppose I have a lens that uses a 58mm filter and another that uses a 77mm filter.  For the sake of the argument, I suppose that elements of lenses in order to filter 58mm are 58mm and 77mm lenses in the goal of 77mm filter elements.

For the reasoning, suppose that both lenses have a focal length of 50mm.  The point being, all things are equal except for the diameter of the lenses in both lenses.  Assume that both lenses are both sides with an aperture of f/1.8.

My question is this.  The larger lens let more light than the smaller goal when both lenses are set to the same aperture setting?

The short answer is, no.  F1.8 or f2 or some f-stop, that's exactly right.  No matter what the lens is the size.  Since it is a ratio, the actual size of the aperture blades will be different but f1.8 will always be f1.8.  He will leave in exactly the same amount of light.

Not even two 50mm lenses with items of different sizes will be identical, but the ratio f-stop will be.  Exactly the same amount of light going through it.

If it was not so count in a camera would be impossible.  I hope this is clear for you.

Tags: Canon Camera

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