Updated
Triplet in the constellation LeoMar 28th, 2020
9 h 12 m
Captured an additional 3 hours in the red channel. Consequently, 3 hours were added to the synthetic luminance channel. Scale 70%.
Triplet in the constellation Leo
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Today's trio. (March 20, 2020, or rather yesterday's already :)) ) Aperture stopped down to f/5. Yes. Aperture rules. The previous shot had 120-second exposures, lower gain, but higher transparency. Although the total integration was different. Maybe it's precisely about the integration time. But it seems that stopping down the aperture also reduced the resolution. I'll try switching to the Jupiter-21M lens. I'll stop it down to f/5 and get the aperture of a Jupiter-37, but at a fully open aperture. We'll see.
Technical information
- Telescope/Lens
- Jupiter-37A
- Camera
- ZWO ASI 178 mm
- Mount
- Sky-Watcher EQ3-2 MyDrive
- Guide Scope
- Юпитер 21М
- Guide Camera
- QHY 5
- Accessories
- Фильтр Baader Planetarium NEODYMIUM 1.25", ССD-фильтры NoNaMe
- Software
- Maxim DL, DeepSkyStacker, FitSracker, PS
- Location
- Kharkiv, Ukraine
Light pollution
Orange, Bortle 6 zone
Exposure
- 12 × 360″ · ISO/Gain: 180
Total exposure: 1 h 12 m
Photo versions
Triplet in the constellation Leo
Mar 27th, 2020
6 h 12 m
L-channel synthesized from three color channels. Scale approximately 60%.
Triplet in the constellation Leo
Mar 24th, 2020
1 h 30 m
Jupiter 21M test. It seems like the light grasp has improved, judging by the lettuce leaves in the Hamburger. The detail also seems higher. But the overall impression of the lens is just okay. It still doesn't have the same sharpness as the Jupiter 37A. The aperture was stopped down to f/5.
Current photo
Triplet in the constellation LeoMar 21st, 2020
1 h 12 m
Today's trio. (March 20, 2020, or rather yesterday's already :)) ) Aperture stopped down to f/5. Yes. Aperture rules. The previous shot had 120-second exposures, lower gain, but higher transparency. Although the total integration was different. Maybe it's precisely about the integration time. But it seems that stopping down the aperture also reduced the resolution. I'll try switching to the Jupiter-21M lens. I'll stop it down to f/5 and get the aperture of a Jupiter-37, but at a fully open aperture. We'll see.
Triplet in the constellation Leo
Jan 19th, 2020
3 h 18 m
A trio of galaxies in the constellation Leo and neighbors. Imaging from January 8th and 17th, 2020. Scale 70%. Seems slightly out of focus.
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1. The offset value when shooting darks and lights must match and be such that the dark histogram is not clipped on the left.
2. I don't calibrate with biases. The camera has low read noise, plus the bias is already contained in the dark.
As soon as I corrected the two issues above, everything immediately worked out.
Additional notes on calibration for this camera:
- I calibrate with flats, and I calibrate the flats beforehand with dark flats.
- I shoot darks at home after a session using a refrigerator and freezer. I monitor the temperature and move them if necessary. A few days and a dark library for the year is ready, from -10 to 35 degrees.
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