In the evening, the weather was good, I decided to take a little picture of the Moon in color. I tried to shoot a few dozen frames for stacking – I used to get the color from a single frame. I shot through several telescopes – Sky-Watcher BKP150750 and Celestron Nexstar 8 SE, but so far I have processed images only from Sky-Watcher. A little more I admired the Moon through binoculars JJ-Astro 22х100 – big, bright, large.
I managed to shoot the Seagull nebula in the constellation Monoceros 5 times. Literally before the shooting, the weather deteriorated and the whole sky was overcast with clouds. Several trips out of town were wasted because of the clouds. On February 5, 2019, the weather still took pity on me and was able to fully capture this interesting area of ionized hydrogen. Below and to the left of it is the Thor’s Helmet nebula in the constellation Canis Major, which got its name for its resemblance to the winged helmet of the Scandinavian thunder god. The departure was very successful, there were only a few clouds at the very beginning, while I set up the autoguider and searched for the nebula. There was wind, but the rocks were well protected from the it.
The Seagull and Thor’s Helmet nebulas, February 5, 2019
-Samyang 135\2.0 ED Canon EF lens
-camera Canon 550Da
-filter Svbony CLS clip EOS-C
-mount Sky-Watcher Adventurer
-autoguider: finderscope Sky-Watcher 50 mm + camera ZWO 290 MC.
35 frames per 120 s, ISO 1600.
Calibration with PIPP, stacking with Fitswork.
Scale 25%. Link — at scale 100%.
Location: village Supsekh, Kuban, Russian Federation.
There were great difficulties due to red halos – the result of using a CLS filter with a modified Canon 550Da camera. When shooting without a CLS filter, they practically do not interfere, but due to the noticeable light pollution, I still had to use this accessory. The filter does not transmit light between the red and green ranges of the spectrum, which leads to a choice in focusing – either in the red channel or in the green. It is possible that using a more advanced L-Pro type filter will improve the situation. A compromise is possible – focusing between the red and green channels, but this will lead to a decrease in resolution. Perhaps next time I will try this kind of focus. The problem itself lies in the photo-lens – undematured chromatism and spherical aberration in the red channel. Читать далее…
The last Mars in this shooting season and in 2019 – the angular size of Mars is only 6.4 seconds of arc, and the distance to Earth is about 220 million kilometers (which is comparable to the distance from the Sun to Mars).The best conditions for observing Mars will be in the autumn of 2020.