Focal length

Learn how focal length of a photo lens affects your view of the subject.  You’ll be able to play with different focal lengths and see how they work. That helps to decide if you actually need to buy that expensive telephoto or an ultra wide zoom lens.

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Angle of view

How angle of view is affected by a zoom lens that you have? Tweak the visual controls of  Lens Tutorial application and see for yourself. Did we tell you that you’ll also get hard numbers if you want?

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Depth of Field (dof)

Depth of field (abbreviated as DOF) is a very important concept that is best understood visually. Use Lens Tutorial to manipulate all your lens setting and see how DOF responds. Choose shallow depth of field to isolate your subject. Set large depth of field to add more detailed objects to the view.

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Subject distance

Distance to subject is important in photography. See at what distances you can shoot given a choice of lens parameters. Or modify distances to see how other lens numbers accommodate to it.

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