As a result, the field was significantly vignetted but the two clusters were well covered. The telescope has a 3-inch focuser but, having a 2-inch barrel, could not be expected to cover the full frame sensor. The D610 was controlled over a USB cable from an Android tablet using the program qDslrDashboard and took 56, 20 second, exposures at an ISO of 800. The raw frames had been taken using a full frame Nikon D610 attached to a CFF Telescope’s 127 mm apochromat refractor employing an aspherical oil-spaced triplet objective. I currently do not have any wide angle data to try out, but decided to test Sequator with a set of Nikon raw files that I have extensively tried out with Deep Sky Stacker. As a result, the stars within the sky will be sharp as will be the foreground. The programs will then stack the sky area accounting for the movement of the stars across the sky but stack the foreground with no movement. The sky area is selected leaving the foreground unselected. In this case, a fixed tripod is used with exposures short enough to prevent star trailing. They both have the ability to treat the sky and any foreground separately – great for wide angle night landscapes. The former is only available for the Mac and the latter for Windows. More recently, two new stacking programs have become available Starry Landscape Stacker (~£38.99) and Sequator (free, but a contribution by paypal for a cup of coffee or two is suggested). The latest 64-bit version seems very stable. For many years I have been using Deep Sky Stacker to align and stack my short exposure frames to give the result of a longer exposure.
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