Why do wide angle lenses have f1.4?

Started Sep 25, 2013 | Discussions thread
AnthonyL Senior Member • Posts: 2,637
Re: Why do wide angle lenses have f1.4?

PaulD1980 wrote:

Thank you for your answers.

so for low light situations a wide aperture of f1.4 would be good at achieving a low iso but, with having such a wide open aperture at f1.4 this wouldn't be good for a night time landscape shoot due to shallow depth of field.

So the draw back of having a nice wide open aperture is you will have only a small portion of the image in focus?

Have a look at some DOF calculators eg http://www.dofmaster.com/dofjs.html

With a 24mm lens on a 1.6 crop camera wide open at f/1.4 if you focus on 24m then acceptable focus is from 12m to infinity (hyperfocal).  If it's night time how much detail are you hoping to see?

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