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cabfl

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About cabfl

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    Nebula

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    Canary Islands (Spain).
  1. It depends on the budget: ASI / QHY 183 - 1 '- 2,4um - 12bits - RN: 1e-2,7e (color / monochrome): 135mm = 3.67 "arc / pix - 5.60º 250mm = 1.98 "arc / pix - 3.03º 480mm = 1.03 "arc / pix - 1.58º ASI1600 / QHY163 / Atik Horizon - 4/3 '- 3,8um - 12bits - RN: 1e-2,4e (color / monochrome): 135mm = 5.81 "arc / pix - 7.51º 250mm = 3.14 "arc / pix - 4.06º 480mm = 1.63 "arc / pix - 2.11º ASI294 - 4/3 '- 4,6um - 14bits - RN: 1,2e (color): 135mm = 7.10 "arc / pix - 8.11º 250mm = 3.84 "arc / pix - 4.38º 480mm = 2.00 "arc / pix - 2.28º ASI071 / QHY168C - APSC - 4.88um - 14bits - RN: 2.3e-3.2e (color) 135mm = 7.46 "arc / pix - 10.02º 250mm = 4.03 "arc / pix - 5.41º 480mm = 2.10 "arc / pix - 2.82º QHY268 - APSC - 3.76um - 16bits - RN: 1e (color) 135mm = 5.74 "arc / pix 250mm = 3.10 "arc / pix 480mm = 1.62 "arc / pix
  2. The problem of microlenses only occurs with cameras that use the Panasonic MN34230 sensor: ASI1600 QHY163 Atik Horizon The rest of cmos cameras do not have this problem. It is not a problem of cmos technology. If you are thinking of buying a Full Frame sensor, I recommend waiting for the new CMOS sensors that QHY and ZWO have presented: QHY600 and ASI6200 (monochrome and color): https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=55 Sony BSI, 15 paradas, 60 mpx, 3,76um, ADC: 16 bits, ReadNoise: 1e - 2,3e, FullWell 49Ke, hardware Binning: 1x1 - 2x2 - 3x3, USB3, buffer 2GB DDR3.
  3. Dark noise or Read noise? Read Noise: Atik 490EX - 5e Atik 460EX - 5e Atik 383L+ - 7e Atik 16200 - 10e Atik 11000 - 11e ASI 183 - 1e ASI 1600 - 1.2e ASI 294 - 1.2e QHY 247 - 1e ASI 071 - 2.3e ASI 094 - 2.1e ASI 128 - 2.5e The new CMOS sensors: QHY268C - 1e (ADC 16 bits) QHY600M/C / ASI6200Pro - 1e to 2.3e (ADC 16 bits - 90db = 14,5 bits) https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=56&cut=1 https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=55&cut=1 CCD Sensor: Kaf-16200 = 10e (ADC 16 bits - 69db = 11,5 bits) https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=95&id=17&cut=1 KAF8300 vs ASI1600: https://www.cloudynights.com/topic/549417-asi1600-experiments-with-high-gain-nb-imaging/
  4. In general, the dynamic range is confused with the ADC. CCD cameras do not have 16bits of dynamic range. They usually have a range between 11 and 13 bits, but also a lot of noise and that's why they need a 16bit ADC. 11 bits = 66db 12 bits = 72db 13 bits = 78db Sony ICX694 - CCD Atik460EX / QSI660 = 75db = 12,5 bits = 12.5 DRStops. http://www.qsimaging.com/660-overview.html Kaf-8300 = 70db = 11,66 bits = 11.66 DRStops.. https://www.onsemi.com/pub/Collateral/KAF-8300-D.PDF Kaf-16200 = 69db = 11,5 bits = 11.5 DRStops.. https://www.onsemi.com/pub/Collateral/KAF-16200-D.PDF KAF-1603 = 74db = 12,4 bits = 12.66 DRStops.. https://www.onsemi.com/pub/Collateral/KAF-1603-D.PDF CCD cameras have a lot of noise, and to improve the signal / noise they need very long shots. CMOS cameras have a very low noise, and do not need long shots to get good signal / noise. As you make short shots, then you need to stack more shots to add more signal. But if it's a very weak object, you can make long shots with the CMOS, but watch the fullwell to avoid fat stars.
  5. ASI 290 - 1,4e Unity Gain. QHY 290 - 1,3e Unity Gain. CSX 290 - 3e Unity Gain ??????????
  6. QHY268C - APS-C According to the QHY website, they will launch QHY268C in May 2019. https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=56&cut=1
  7. And the Sitech unit? At first glance, it seems that Mr.Mesu has not put much effort into making it attractive ... rather, for those who do not want to accept the pier. The polemaster is mounted in two places? first in the wedge and then on the plate? Do you have to do the alignment routine twice? The design of 3 screws to align does not convince me. If I was running away from the problems of the first design, I think that this solution is not the best either. I like that the design allows you to wire everything inside, and the Berlebach tripod is fantastic ?
  8. I am very interested in buying a Mesu 200 mount. The new news is exciting and at the same time I have a lot of uncertainty. An improved Mesu 200, lighter, with better quality motors / encoders, and with the best organized wiring ... uaaau, improve what was almost perfect. Mesu 200 is a great mount, very precise, with a lot of load capacity, divisible and transportable, and for a reasonable price. But now I do not understand the new design. It is divisible and lighter = more transportable ... but you need a huge pier? that is not transportable. Non meridian flip is a great advantage, but it is not essential. And it does not help me if I can not transport the equipment with a huge pier. This system is easier or harder to line up to the polar? When you have to assemble and disassemble every night, you want a quick and easy adjustment system. Lucas has thought to offer a version without the pier and with the base of alignment to the polar star? http://www.mesu-optics.nl/mesu200_en.html ------ I am from the Canary Islands (Spain). I'm using google translate, I'm sorry for the grammatical errors.
  9. Hi, I'm from the Canary Islands (Spain). Here in the observatory of my group, at 1850m altitude, the temperature at night drops to 10ºC in summer and -4ºC in winter. A partner, has a UNC 10 "f / 4. The tube gives you problems of stability. Flexions and dilation / contraction. I want to buy another 10 ", but ONTC, because sandwith carbon is more robust. If it's for visual, it does not matter. But for astrophoto it is important.
  10. UNC carbon tubes have problems of flexion and dilation. Ontc tubes are Carbon fiber foam sandwich, much more stable.
  11. Or wait the new cameras: QHY268C - APSC - 16bits, 3.76um, 26mpx https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=56&cut=1
  12. Or wait the new cameras: QHY268C - APSC - 16bits, 3.76um, 26mpx https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=56&cut=1
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