Very sensible advice.
On 9 October 2014 13:05, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
wrote:
> I'd like to offer some technical advice for the next try.
>
> At 300mm the image size on the sensor is only 2.75mm. That means you've
> had to do a fairly severe crop which is showing some noise at ISO 400. Also
> at 300mm you're shooting at a 600mm 35mm equivalent. The 35mm formula for
> maximum exposure time of the moon without showing motion blur is 600 /
> (Focal Length). So with a 1 second exposure time you are exactly at the
> maximum and so pushing the limits. You've also made the exposure at f/11.
> That is well into diffraction territory for a 4/3 sensor. For ordinary
> photography maybe not noticeable. But for high magnification (severe crop)
> it might be.
>
> Taken all this together I would suggest that you take your next shot using
> an aperture of f/5.6. Under optimal conditions f/11 is actually the best
> performing aperture for the 300/4.5 but the performance at f/5.6 is not
> much worse. Shooting at f/5.6 would allow you to split the exposure
> difference between ISO and shutter speed and gain 1 stop on each. You
> could have used f/5.6, ISO 200 and 1/2 second. Also, at f/5.6 you'd have a
> brighter image for focusing.
>
> There are two more total eclipses coming up next year in April and
> September so maybe you'll get another couple of chances. Until then you
> can practice on the non-eclipsed moon which should be a bit easier.
> <http://en.wikipedia.org/wiki/List_of_21st-century_lunar_eclipses>
>
> Chuck Norcutt
>
>
> On 10/8/2014 5:05 PM, bj@xxxxxxxxxxxxxx wrote:
>
>> Hi all,
>> The best of a bad lot.
>> http://zone-10.com/tope2/main.php?g2_itemId=14672
>>
>> Cheers, Brian
>>
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