From: Bruce Walker
On 11-10-14 4:33 PM, John Sessoms wrote:
From: David J Brooks
Thanks
Dave
On Fri, Oct 14, 2011 at 8:46 AM, Bruce Walker
<[email protected]> wrote:
Just a heads-up for anyone interested in trying night photography.
Here's a
free introductory 24 page eBook (PDF) on the subject ...
http://availablelightimages.com/blog/night-photography/
The content looks pretty good. Author makes a couple of questionable
assertions, but stuff like his suggestions about doing high-ISO
quick grabs
(eg 30 secs) to check the histogram prior to doing a 2 hour exposure
seem
spot on.
It occurs to me that this will be a lot more difficult with K20D
because you can't turn off the long exposure noise reduction. How are
you going to get contiguous star trails?
Or has anyone come up with a hack that will allow the K20D's long
exposure noise reduction to be turned off?
Don't you just wait for twice the exposure time for the final result? I
haven't tried star trails. My longest K20D exposure has been something
like 5 minutes.
However long your exposure is you have an equal length duplicate while
the camera makes the dark frame exposure with the shutter closed. A 5
minute exposure followed by a 5 minute dark frame.
Meanwhile the stars have moved. Instead of trails you get dotted lines.
You can turn it off on the K10D and the K5, but not the K20D & K7 (and I
think K200D & K-x).
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