Wuhuuuu...NIKONs erste Astrokamera!
Verfasst: 10.02.2015, 08:00
Guten Morgen!
Die Gerüchte waren also korrekt - bitte schön:
Most cameras' Infrared filters are rather broad-ranging and filter out some visible red light, as well as IR. The filter on the D810a is much more precise, meaning the camera is around four times more sensitive to long-wavelength red light than an ordinary DSLR. This makes it much more able to capture the Hydrogen Alpha spectral line (656nm): the precise color emitted by the hot clouds of Hydrogen gas that occur in emission nebulae. The modification won't make much of a difference when shooting sunlight reflected off the moon or planets and is likely to give a reddish tinge to ordinary photography.
The camera's full frame sensor means it's able to offer better high ISO performance than previous consumer astrophotography cameras that used smaller sensors.
Additional features include a Long Exposure M mode that provides selectable shutter speeds from 4 to 900 sec (15 minutes), before having to use bulb or time mode. A virtual exposure preview in bulb and time settings, similar to Olympus’ livetime mode, lets users essentially see in the dark, so that they can frame and focus. And a dark frame subtraction mode (called ‘astro noise reduction’ in Raw), should help to keep noise in check when aiming for the stars. Other changes come in the form of a red virtual horizon, so as not to interfere with night vision, and the ability to dim the viewfinder’s OLED.
Interessant scheint mir hier vor allem das "Bulb-Preview" zu sein...
LG,
Michael S.
Die Gerüchte waren also korrekt - bitte schön:
Most cameras' Infrared filters are rather broad-ranging and filter out some visible red light, as well as IR. The filter on the D810a is much more precise, meaning the camera is around four times more sensitive to long-wavelength red light than an ordinary DSLR. This makes it much more able to capture the Hydrogen Alpha spectral line (656nm): the precise color emitted by the hot clouds of Hydrogen gas that occur in emission nebulae. The modification won't make much of a difference when shooting sunlight reflected off the moon or planets and is likely to give a reddish tinge to ordinary photography.
The camera's full frame sensor means it's able to offer better high ISO performance than previous consumer astrophotography cameras that used smaller sensors.
Additional features include a Long Exposure M mode that provides selectable shutter speeds from 4 to 900 sec (15 minutes), before having to use bulb or time mode. A virtual exposure preview in bulb and time settings, similar to Olympus’ livetime mode, lets users essentially see in the dark, so that they can frame and focus. And a dark frame subtraction mode (called ‘astro noise reduction’ in Raw), should help to keep noise in check when aiming for the stars. Other changes come in the form of a red virtual horizon, so as not to interfere with night vision, and the ability to dim the viewfinder’s OLED.
Interessant scheint mir hier vor allem das "Bulb-Preview" zu sein...
LG,
Michael S.