IMPORTANT! Long time exposures without purpe corner!

Started Oct 19, 2005 | Discussions thread
OP Nordstjernen Veteran Member • Posts: 6,876
Re: How long is the longest shot you actually take?

To bring the information/sky background away from the left side of the histogram, I am using 5 minutes at ISO 800 and aperture f/4.5 (max with my 400 mm glass). Even 3 minutes works well, and 30 sec exposure time is not too bad at this relative slow aperture! Still, I will explore longer exposure time, but not more than 10 minutes, I think. I will also try ISO 1600.

Many exposures that brings a total of 30 to 60 minutes seems to give very good results when the conditions for observation is good.

According to the histogram 5 minutes is a good balance between info/noise level (data) and tracking time/turbulent air (real world conditions). With a f/2,8 lens 2 minutes shold work really well at ISO 800.

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