The ideal UV-IR blocking filter for H-alpha-sensitive cameras, such as astro-modified DSLRs!
The filter absorbs disturbing UV and IR light, thereby increasing the contrast in the H-alpha range (H-alpha EH in the product name stands for enhanced, i.e. amplified in H-alpha). This makes it ideal for photographing galactic nebulae, for which astromodified DSLR cameras are also very popular.
If you remove the chip filter from a digital SLR camera to make the camera more sensitive to the H-alpha wavelength, the image will inevitably turn very red when shooting in daylight. In addition, all pixels in the near-IR range between approximately 750 nm and 1200 nm become light-sensitive again. This further increases the red sensitivity and causes coloured halos around stars when optics with lenses are used (chromatic aberration). The camera must therefore be filtered again. But how can this be done in a way that is optimal for the eye?
There is a trick you can use: if you filter out a large part of the red light up to near the H-alpha line and then allow the astronomically interesting H-alpha line to pass through again in a narrower transmission channel, you get a largely natural colour reproduction in daylight and still optimal reproduction of astronomical objects. This means that the colour balance is only slightly distorted and you still have full sensitivity at H-alpha! Not only are daylight images reproduced beautifully neutrally, but night images are also not reddish, yet the red nebulae still come into their own.
- Specially developed for photography with DSLR cameras and astronomical colour cameras (ZWO, ATIK, etc.)
- High-quality anti-reflection coating
- Particularly scratch-resistant hard coating
Made in Japan!
