When using old rules of thumb like... shutter speed should be as fast as
the reciprocal of focal length... I think you should count the focal
length as 600mm. Then, using the sunny 16 rule and ISO 800 gives 1/800
second at f/16. But if you open wide to (let's call it f/8 rather than
f/6.7) you can shoot at 1/3200 which is faster than you need even
without IBIS.
I'm not sure that the sunny 16 rule is fully correct for high latitudes
like Alaska. But, even if you lose a stop due to atmospheric
attenuation, you've got plenty of leeway. Even if you lose two stops to
cloudy skies you've got the IBIS to compensate and the ISO dial if all
else fails.
ps: A rolling/pitching ship is not exactly a stable platform for a
tripod. Leave it home.
Chuck Norcutt
On 8/17/2015 12:03 AM, Paul Braun wrote:
Going through the responses to my "Upcoming Fun" post, Joel suggested
that perhaps packing the Manfrotto might be unnecessary.
My original thought was to set the E-M5 up on the tripod on our balcony
as we cruised past the mountains and ice. But Joel brings up a valid
point - I've gotten photos with the 75-300 racked all the way out that I
never would have thought I could.
What's the general wisdom of the tribe? If the vote is overwhelmingly
"won't really give you much gain" then I'll save the space in the
suitcase. I know I wouldn't pack it with me on any excursions - they're
not really designed for a guy with a bag of camera and a tripod.
What say you?
--
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