h-alpha

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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Sun in h-alpha line. 2019-01-09, 13:37

Солнце в линии водорода. 9 января 2019 года, 13:37

Sun in h-alpha line. 2019-01-09, 13:37

Equipment:
-telescope Coronado PST H-alpha 40 mm
-mount Sky-Watcher Adventurer
-filter Deepsky IR-cut
-camera QHY5III178m.
Stacking 1000 frames from 2966, movie 60s (50 fps).
Location: Russia, Anapa, backyard.

My first shot of the Sun in the new 2019. The chromosphere is fairly calm, but there are several large prominences. Shooting was slightly disturbed by the dust in front of the matrix, I decided to unscrew the Ir-cut filter and was surprised to find that the brightness rose noticeably, as well as other dust particles appeared. The conclusion is strange – Coronado “flows” at IR. This feature requires more careful research. For the rest – no surprises, the camera still gives out a striped pattern, which was eliminated by the settings of the wavelets in Registax. I tried to shoot with Sky-Watcher Adventurer mount, approximately setup the polar axis. It is quite possible to shoot, only inconvenient without the remote.

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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