best camera lens of all time image
John Alder
How can I clean a cellphone camera lens without scratching it or damaging it?
How can I clean a cellphone screen without scratching it or damaging it?
How can I clean a computer monitor without scratching it or damaging it?
Answer
The safest way is with bottled water and the same lens cleaning cloths you get from the places that sell eyeglasses.
The safest way is with bottled water and the same lens cleaning cloths you get from the places that sell eyeglasses.
What does it mean when a camera lens has a fixed aperture?
Danny
I'm looking into buying a bigger camera lens, and I keep on seeing lenses that have a fixed aperture and some that don't. What does that even mean?
Answer
First you need to understand what aperture is: It is the ratio of the length of the lens to the diameter of the lens- thus the larger the aperture (the smaller the number, the larger the aperture) the more light will pass through the lens. This means faster shutter times are possible since more light comes through the lens.
Now, in zoom lenses keeping this ration constant, a "Fixed Aperture", requires very specialised engineering which makes the lens more expensive. However such a lens is far better in low light conditions and tends to be much better engineered than one with a variable aperture/ With a variable aperture as you extend the zoom the aperture gets smaller and less light gets through the lens. This means exposure, shutter speeds etc need to change as you change the zoom on the lens- making using the lens more difficult as you have to vary settings more frequently.
First you need to understand what aperture is: It is the ratio of the length of the lens to the diameter of the lens- thus the larger the aperture (the smaller the number, the larger the aperture) the more light will pass through the lens. This means faster shutter times are possible since more light comes through the lens.
Now, in zoom lenses keeping this ration constant, a "Fixed Aperture", requires very specialised engineering which makes the lens more expensive. However such a lens is far better in low light conditions and tends to be much better engineered than one with a variable aperture/ With a variable aperture as you extend the zoom the aperture gets smaller and less light gets through the lens. This means exposure, shutter speeds etc need to change as you change the zoom on the lens- making using the lens more difficult as you have to vary settings more frequently.
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