I'm getting a new lens please tell me what changes I should expect

Started Jun 27, 2012 | Discussions thread
Tom_N
Veteran MemberPosts: 7,359
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Re: I'm getting a new lens please tell me what changes I should expect
In reply to dennissaid, Jun 27, 2012

dennissaid wrote:

I know the F is at 1.7 which means the aperture is capable of a lot of light right?

Maximum aperture at 20mm: f/3.5 on your kit lens, f/1.7 on this lens

Difference = (f/1.7 / f/3.5)^2 = (3.5 / 1.7)^2 = roughly four times the maximum light intensity (in same lighting) = four times the shutter speed (for the same exposure and ISO).

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