Subscriber Discussion

Width Of The Lens

UD
Undisclosed Distributor #1
Jun 05, 2016

once the iris is opened all the way, the physical limitation is the width of the lens itself.

Can anyone explain me what is meant by width of the lens in the above line ??

U
Undisclosed #2
Jun 05, 2016
IPVMU Certified

It means that if the Iris is not obscuring any part of the lens, then the amount of light the lens lets in is limited only by how big the lens is.

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Brian Rhodes
Jun 06, 2016
IPVMU Certified

Consider lens 'width' and lens 'diameter' the same in that sentence.

U
Undisclosed #2
Jun 07, 2016
IPVMU Certified

Sometimes I use little ditties to help me remember facts, like this one sung to the song from 'Rocky':

It's the size of the iris,
It's the width of the lens,
Stopping up to the challenge of our level.

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