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16 Dec 18, 08:13 PM |
#11
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Thread Starter
Imagineer
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Thank you
No chance of taking photos today - chucking it down! Got very wet on the walk!
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Index of my trip reports 2016 Quebec - Kuala Lumpar - New York City 2017 Dubai - Eurocamps France - Ontario and Quebec - So-Cal 2018 Montreal - Bangkok - New England 2019 Argentina - Quebec City - Hong Kong - 2020 Switzerland 2022 Arizona - Costa Med Cruise - Oslo 2023 Hong Kong - Gothenburg |
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17 Dec 18, 10:12 PM |
#12
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Imagineer
Join Date: Feb 13
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What speed is your lens?
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19 Dec 18, 11:38 AM |
#13
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Thread Starter
Imagineer
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__________________
Index of my trip reports 2016 Quebec - Kuala Lumpar - New York City 2017 Dubai - Eurocamps France - Ontario and Quebec - So-Cal 2018 Montreal - Bangkok - New England 2019 Argentina - Quebec City - Hong Kong - 2020 Switzerland 2022 Arizona - Costa Med Cruise - Oslo 2023 Hong Kong - Gothenburg |
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20 Dec 18, 10:32 PM |
#14
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Imagineer
Join Date: Feb 13
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OK - so a "fast" lens lets more light in. This is measured by the f number.
If you have a zoom lens, it will be fxx to fyy where the first will be the speed at widest angle and the second will be the speed at max zoom. For a prime lens it will just be fzz Zoom lenses are generally much slower (and therefore need more light) unless you spend a fortune. Some have the same speed through all zooms (or focal length range). Often f3.5 to f4.5. Decent prime lenses might be say f1.8. The lower the number the faster the lens and lets more light in. |
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