Feature(may vary by option.)
●R-640 Hoshino Photo Filter
●The requests for astrophotography fans were made to commercialize under the guidance of Professor Takao Nakanishi. This filter was discontinued due to low sales by major manufacturers, and the filter you want for Hoshino photography
●The R640 cleanly cuts a wavelength less than 640nm. It reduces the majority of light pollution, so you can take photos in some light harm. It is photographed with a long wavelength similar to near infrared rays, so it is less likely to be affected by the moonlight. In addition, since it can only be used to capture wavelengths near the Hα line, it can avoid the effects of chromatic aberration in the photo-pollution system
●(Exposure multiples) Like genuine Astro models and modifiers the highly sensitive Hα line is about 5 to 6 times and the effect of light pollution is very large, so it can be used to over 10 times in places with light damage. For digital SLR camera normal units, since it is less sensitive to long wavelengths than 540nm, the exposure times are more than 10 times
●Net Weight: 115g
[150x150mm]
Description
R-640 Hoshino Photo Filter
The requests for astrophotography fans were made to commercialize under the guidance of Professor Takao Nakanishi. This filter was discontinued due to low sales by major manufacturers, and the filter you want for Hoshino photography.
The R640 cleanly cuts a wavelength of less than 640 nm. It reduces the majority of light pollution, so you can take photos in some light harm.
It is photographed with a long wavelength similar to near infrared rays, so it is less likely to be affected by the moonlight. In addition, since it can only be used to capture wavelengths near the Hα line, it can avoid the effects of chromatic aberration in the photo-pollution system.
This is not a general light pollution filter that cuts yellow cabries such as sodium lamps.