Most of you probably know this but......
Some lenses have a variable aperture. Like between f/3.5 and f/5.6.
When a lens has 2 numbers for f-stops it means it varies as you zoom.
So if you have a 17-50mm F/3.5-5.6 at 17mm it can be at F/3.5 but at 50mm it will be at F/5.6
I have a Canon 28-135 F/3.5-5.6 IS
The IS (image stabilizer) helps a lot with making up for the variable aperture and more.
Some lenses have a variable aperture. Like between f/3.5 and f/5.6.
When a lens has 2 numbers for f-stops it means it varies as you zoom.
So if you have a 17-50mm F/3.5-5.6 at 17mm it can be at F/3.5 but at 50mm it will be at F/5.6
I have a Canon 28-135 F/3.5-5.6 IS
The IS (image stabilizer) helps a lot with making up for the variable aperture and more.
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