I took a little picture of the Sun in the line of hydrogen. At the same time, I tested the new Sky-Watcher AZ-GTi mount – Ыun alignment is possible, tracking without problems.
Equipment:
-Coronado PST H-alpha 40 mm telescope
-Sky-Watcher AZ-GTi mount
-Deepsky IR-cut filter
–QHY5III178m camera
Stacking 250 frames from 1800.
Based on recent images of the Sun, I made an animation of two images – at a wavelength of 540 nm and 656.28 nm.
The first picture was obtained using a Baader Solar Continuum 540 nm filter. This is a narrow-band filter of green color, well distinguishes solar granulation and flare fields. It is especially useful when shooting the Sun with achromatic refractors, as it cuts off chromatism. Used ONLY in conjunction with a protective aperture filter, in this case with Baader AstroSolar Photo. For shooting, I recommend using a monochrome camera. When shooting with a color camera, it is better to use only the green channel.
The second image was taken with the Coronado PST H-alpha 40 mm chromospheric telescope in conjunction with the achromatic Celestron 102 SLT refractor. Very interesting and very dynamic processes can be observed in the hydrogen line on the Sun – solar flares, emissions, prominences and fibers. The spots in the hydrogen line look different. For shooting in the line of hydrogen, you must use filters with a very narrow bandwidth – less than 1 nm. The usual narrow-band hydrogen filter with a band from 12 to 3 nm, designed for shooting hydrogen nebulae, is not suitable for shooting the Sun. It is necessary to use either the Coronado PST H-alpha special-purpose solar telescope (Lunt H-alpha), or the Quark H-alpha special eyepiece. It should be noted that the colors are conditional. The Solar continuum filter is green, and the Sun through the Coronado PST H-alpha telescope is carrot-orange, as in the picture.
Equipment:
1st image, May 7, 2019, 10:33..
-filter Baader Astrosolar Photo
-telescope Celestron NexStar 8 SE
-filter Baader Solar Continuum
-camera QHY5III178m.
2nd image, May 7, 2019, 11:19.
-telescope Celestron 102 SLT
-homal lens NPZ
-telescope Coronado PST H-alpha 40 mm
-filter Deepsky IR-cut
-camera QHY5III178m
-mount Celestron Nexstar SE.
Location: Russia, Anapa, backyard.
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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Astrophotography is a type of astronomical observation in which images of celestial objects are taken. For astrophotography, it is not necessary to use a telescope – a photographic lens can be used as an astrograph. However, such photographic lenses are subject to completely different requirements than for everyday photography – good sharpness across the entire field is required, as well as minimal distortion (aberrations) even when shooting with a fully open aperture. Accurate centering of the lenses in the lens is very important.
For rapid accumulation of light, a high aperture ratio is desirable. This is especially true for short summer nights.
One of the most important parameters of a photographic lens is the focal length. The longer the focal length, the larger the size of the object image on the photodetector. There is no such thing as magnification in astrophotography, since the size of the image on the screen may vary, as well as the distance from which the image is viewed. However, one can very roughly imagine 1x magnification as looking at a 10×15 cm photograph from a distance of about 30 cm, obtained using a 50 mm photo lens and a camera with an APS-C format matrix (about 25.1 x 16.7 mm). Then the angular size of the object in the image will coincide with the angular size of the object in the sky.
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Samyang 135mm f/2.0 ED UMC Canon EF astronomical reviewRead More »
Оборудование:
-Samyang 135mm f/2.0 ED UMC Canon EF
-Sky-Watcher AZ-GTi mount
-Sky-Watcher Star Adventurer EQ wedge
-Deepsky H-alpha 12 nm filter 1.25″
-MEADE Deep Sky Imager IV camera
Stacking 36 frames per 30s, false color.
Location: Russia, Anapa, backyard.
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