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How does focal length affect low light??
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<blockquote data-quote="LensWork" data-source="post: 40679" data-attributes="member: 1283"><p>As others have stated, f/1.8 is f/1.8 regardless of focal length. So using a shorter focal length lens of equal maximum aperture will <u>not</u> allow you to use a faster shutter speed. What has not been mentioned in terms of how focal length can effect shutter speed in low light is that with a shorter focal length lens you can use a slower shutter speed and still avoid camera shake. The general rule-of-thumb is that the minimum hand-holdable shutter speed is approximately the reciprocal of the focal length of the lens. Example: the minimum hand-holdable shutter speed of a 35mm lens would be 1/35 second (1/30 being the nearest available), whereas a 50mm lens would require 1/50 second (2/3 stop faster). As I said, this is only a general rule-of-thumb. I have hand-held a 300mm f/2.8 @ 1/15 second and got a razor sharp image (no VR!).</p></blockquote><p></p>
[QUOTE="LensWork, post: 40679, member: 1283"] As others have stated, f/1.8 is f/1.8 regardless of focal length. So using a shorter focal length lens of equal maximum aperture will [U]not[/U] allow you to use a faster shutter speed. What has not been mentioned in terms of how focal length can effect shutter speed in low light is that with a shorter focal length lens you can use a slower shutter speed and still avoid camera shake. The general rule-of-thumb is that the minimum hand-holdable shutter speed is approximately the reciprocal of the focal length of the lens. Example: the minimum hand-holdable shutter speed of a 35mm lens would be 1/35 second (1/30 being the nearest available), whereas a 50mm lens would require 1/50 second (2/3 stop faster). As I said, this is only a general rule-of-thumb. I have hand-held a 300mm f/2.8 @ 1/15 second and got a razor sharp image (no VR!). [/QUOTE]
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How does focal length affect low light??
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