Iris closes as i zoom in.???

I

Ianb123

Active member
when i have the iris open and zoom in to get a shallower depth of field, as i zoom in, the iris closes. Why can't i have the iris open at f1.6 while i am zoomed in?
 
That's the nature of lenses. Most film and video lenses lose light as you telephoto.

Generally it's higher price lenses that don't lose light as you telephoto. I believe the XL-H1 lens maintains the same aperture through the entire range, but I might be mistaken.
 
If you had a 20x zoom lens that maintained its aperture optically it would be huge and quite expensive.

That's why they lose light.
 
Mirezzi said:
Generally it's higher price lenses that don't lose light as you telephoto. I believe the XL-H1 lens maintains the same aperture through the entire range, but I might be mistaken.
Click to expand...

The 16x manual does that, but not the zoom lense that comes with the H1.
 
And to be a fair, although it isn't exactly a terrific lens, most lenses including expensive ones narrow the iris upon zooming.
 
it shouldn't be that bad, I zoom in completely when I shoot on sunday mornings at my church and from full wide to full zoom I only go from 1.6 to 3.4 or so....its a loss of light but the lens doesn't close that much.

- Kyle
 
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