Panasonic 7-14 - Usage tips for UWA neophyte

Started 3 months ago | Discussions thread
Anders W
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Re: Panasonic 7-14 - Usage tips for UWA neophyte
In reply to Florida Nature Photographer, 3 months ago

Florida Nature Photographer wrote:

Anders W wrote:

For the shot I posted (7 mm on MFT), the formulas would give us 600 / (7 x 2) = 43 s or 500 / (7 x 2) = 36 s, where the latter value comes pretty close to the 30-second rule of thumb I gave Florida.

So the 12-40 at say 20mm would be 600 / 40 = 15 or 500 / 40 = 12.5.

Why do I need shorter shutter speeds for long focal lengths?

Richard already gave you the answer. Another way of saying the same thing is that the greater magnification of a longer FL magnifies the problem. If a star is an extremely small part of the image, the fact that it is oblong rather than round won't be seen as clearly.

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