The Heart Nebula in Perseus is an interesting region of red hydrogen clouds mixed with dark nebulosity and bright star clusters. This was a test-run: first light with the Sequence generator Pro combined with the Nikon D750 (with autofocus by PegasusAstro, worked wonderfull). Second test (living dangerously!): first attempt to mosaic automatically with SGP.
The D750 would crash SGP when hitting the “link” button: as soon as I touched that button, SGP would collapse and simply vanish in thin air. Solution: install the 2013 C++ redistributables.
The Optolong Pro filter OR the reducer/flattener (or the combination) imho added a lot of vignetting and uneven illumination to the image, which I had a hard time eliminating. So next test would be with a regular Nikon T-ring. If that does not solve the issue then it must be the F5 reducer. I noticed earlier already that images at F7 with the Nikon were a lot cleaner.
![](https://i0.wp.com/www.drogenberg.be/wp-content/uploads/2019/11/Heart-Nebula-67x300s-Nikon-D750-ISO800-Optolong-Pro-SQM20-Esprit120-F5-Meldert-Small.jpg?resize=525%2C406&ssl=1)
IC1805 or the Heart Nebula in Perseus. Image dedicated to my mom who passed way in September age 79.