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.
Проба Юпитера 21М. Вроде увеличилось проницание, судя по листам салата в Гамбургере. Вроде и детализация выше. Но общее впечатление от объектива, так себе. Все таки нет такой остроты как у Юпитера ...
Сегодняшнее трио. (20.03.2020г, точнее уже вчерашнее :)) ) Диафрагма поджата до 5-ти. Да. Апертура рулит. Прошлый снимок с выдержками 120 сек., гейн ниже, а проницание выше. Хотя накопление было рз...
If you're referring to the rays in the upper right corner, then no. The darks and biases are original. But this glow still doesn't go away. I don't know what to do about it. This is the actual side of this camera, or maybe my specific unit. They just don't disappear completely, that's all.
I wrote about it because I had the same problem. In this case, offset is the value that the software adds to the pixel signal value, not the calibration offset frame. I solved the problem as follows:
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.
Comments
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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