туманности

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.

Туманность

The Seagull and Thor’s Helmet nebulas, February 5, 2019

Equipment:
-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.
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Водородные туманности возле звезды Денеб, 6 ноября 2018 года

Hydrogen nebulas nearly Deneb, 2018-11-06

Equipment:
-lens Samyang 135\2.0 ED Canon EF
-camera Canon 550Da
-filter Svbony CLS clip EOS-C
-mount Sky-Watcher Adventurer
42 frames per 60s, ISO 800.
Calibration and stacking at DeepSkyStacker.
Scale: 25%. At link – 50%.
Location: Russia, Anapa, backyard.

This capturing was carried out purely for the sake of testing the filter Svbony CLS – it was interesting how this filter can improve the selection of nebulae from the background of the city illumination. The filter works quite well, however, when shooting with a Samyang 135\2.0 ED lens, there are noticeable red halos. The filter itself has a noticeable gap between the red and green rays. In addition, the camera with the removed “blue glass”, so the halos are more noticeable than on the camera without modification. We have to pay particular attention to the red channel during processing. On a mirror optics, as well as lenses with good chromatic correction, such halos should not arise.

Single frame example:

 

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Orion Nebula, 2018-12-09

Туманность Ориона, 9 декабря 2018 года

Orion Nebula, 2018-12-09

Equipment:
-telescope Sky-Watcher BKP2001
-mount Sky-Watcher EQ6 SynScan Go-To
-coma corrector Baader MPCC
-filter Optolong H-alpha 12 nm
-camera QHY5III178m.
-guider-finderscope 50 mm + camera ZWO 290 MC.
905 frames per 1s.
Calibration at DeepSkyStacker, stacking at Autostakkert, deconvoluton at ImPPG.
Place: Russia, Anapa, backyard.
Scale 50%. At 100% scale – link.

I visited my astronomical friends and took a little shot of the Orion Nebula. I finally took off from a normal telescope, not a photo lens, but I got some troubles in processing. First, with the addition of black spots on the image. The shooting took about 40 minutes (2143 frames), of which 905 best frames were added. 1,200 dark frames were captured. Shooting was guided, but without dithering. It is possible that the lack of dithering and caused the appearance of black spots. There is also an idea that calibration problems appeared due to instability of the camera temperature.
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