This new line of Baader LRGBC filters supplements the
Baader narrow band emission line filters. These filters are designed for
CCD astrophotography and an essential accessory for lunar and planetary
observations. The filters allows for recordings with the same exposure
time that is considered very important for automated continuous
shooting. Baader's LRGBC filters deliver improved color separation and
image quality without annoying halos, the Baader Blue filter passes
virtually all of the H-Beta and O-III lines, while the Green filter is
able to capture all of the O-III line, without encroaching into the
H-Beta line, in addition, the Green and Red filter passbands nearly
touch, leaving only a sharp notch to block out the primary
Mercury/Sodium light pollution line at 580nm. The high transmission
everywhere else delivers the shortest combined exposures possible with
every detector. The Baader O-III perfectly isolates the two doubly
ionized oxygen lines (496 and 501nm), through a very sharp and narrow
bandpass 8.2 nm wide!, the narrowest of any O-III filter, while the
Baader SII will block all unwanted sodium light pollution and longer
wavelengths. Baader's H-Alpha filters ultra narrow bandwidths with
extremely high transmission rates enables high-contrast deep sky images.
The high optical quality of the Baader narrowband filters guarantees no
loss in sharpness or contrast. Each substrate is fine-optically polished
plane parallel to deliver a smooth and accurate 1/4 wavefront over the
entire surface. This special custom polishing operation sets Baader
filters apart from the standard commercially precision polished filter
substrates used by most other filter manufacturers. Baader Planetarium
filters are truly designed to be stacked and combined due to the high
optical quality and highly efficient anti-reflection multicoatings.
Premium quality coating is applied that offers optimum light
transmission. |