300mm F2.8 Nikkor

This lens is a beauty and has been since long on my wishlist. The initial tests indicate some slight defocus on the left side of the image ( at F2.8). But sharp enough overall and especially in the centre. The intended use of this lens is to exploit it’s fast F/Ratio: fast comet imaging with the Nikon D750 / Large Milky Way or nebula complexes with the Nikon D750 and narrow band imaging with the ASI183mm.

Some test shots (unguided)

Crop of the rising Moon 300mm F2.8 Nikkor @ F4
6 x 30″ on ISO400 @ F2.8, slightly cropped ; no guiding on an EQ8

Getting horrified seeing the Starlink satellite trail

During imaging tonight (24-25 May) I was totally surprised by the fly-over of multiple dozens of lights, in one straight line and with a fixed distance. Absolutely beautifull and magic. Just by coïncidence. Apparently these are the Starlink satellites. I DO HOPE that these satellites do not remain as bright, can you imagine 2000 of these swirling around the globe.? I would at that point call it sky pollution. See also the nice movie from Marco Langbroek: https://vimeo.com/338361997?fbclid=IwAR0Q9aZ36LzuUxgk5CXFrhnJd3EkurECKC5Ed8RJci33cofp-sfLaNlxsR8

NGC4565 in Coma Berenices

And what a beautiful edge-on sprial galaxy this is! I made almost 3 hrs of 120-second frames with the ASI183mm Pro and the Esprit. Then I combined the resulting monochrome (Black/White) image with the older C11/Nikon D750 color frames I had from last year. This process included debayering of the color frames into a Red, Green and Blue version. And again recombining an LRGB with the monochrome and RGB frames. Finishing in APP (Background neutralisation, removing Lightpollution ) and in Photoshop.

This is the monochrome ASI image. It is wortwhile exploring it a full resolution in Astrobin, detecting the many little galaxies in the background.

Since the Field of View of the Esprit/ASI is much larger then the C11/Nikon, this image was cropped to fit the color frames.