Please use another browser such as Chrome, Edge, Firefox, or Safari for the best experience

Skip to content Askar FMA135 Sale
Skip to the end of the images gallery
Baader 1.25 CMOS Optimized Blue Filter Baader CMOS Optimized RGB Filter - 1.25 Blue
Skip to the beginning of the images gallery

Baader 1.25" CMOS Optimized Blue Filter

Free shipping
SKU: BAD-FCB-1
$123.00

Add Apertura Air Blower for Lens Cleaning to your order

+ 
$9.99

Add Apertura Lens Pen Optics Cleaning Tool to your order

+ 
$8.99
 
Ask an Expert
expert photo

Baader 1.25" CMOS Optimized Blue "B" Filter

Allowing wavelengths between 400 nm and 510 nm to pass, the shortest range of the three RGB filters in Baader's CMOS optimized color filter set, makes this 1.25" Blue "B" filter best suited for capturing images of objects in the H-Beta line (486 nm) such as the Horsehead nebula. In addition, both this 1.25” "B" filter and the 1.25” “G” filter allow 501 nm O-III emissions to pass through for double the O-III line power when used at the same time. This leads to extremely high maximum transmission for unparalleled deep sky S/N.

Baader CMOS Optimized Blue "B" Filter Highlights

  • CMOS optimized 1.25" Blue "B" Bandpass Filter from Baader designed for use with between f/15 and f/1.8 focal ratio telescopes.
  • Transmission for each individual RGB color channel is remarkably high in order to decrease stray light and reflections to extraordinarily low levels.
  • Balanced 1:1:1 subframe exposures, vitally important for performing automated imaging tasks, can be captured by using this filter.
  • Steep slopes at all transmission curves give this filter a nice contrast boost.
  • All Baader RGB filters are coated and planeoptically polished separately with Reflex-Blocker™ hard coatings and Life-Coat™ sealed coating edges instead of cut out of a larger glass plate.
  • The thickness of this parfocal filter satisfies current standards.
  • The entire circumference contains blackened edges with black outer rim on the telescope side that acts as a filter-lead-side-indicator to prevent reflections resulting from light emissions spilling onto the edge of the filter.
  • Using the "B" and "G" filters together doubles the energy emitted from the O-III line, leading to the utmost peak transmission for the best possible deep sky S/N yield.
  • Although optimized for CMOS cameras, this filter works just as well with older CCD cameras.

More about Baader CMOS Optimized RGB Filters

Compatible with a wide range of telescope focal ratios, from f/15 to f/1.8, Baader RGB filters are optimized for modern CMOS camera technology. With these filters, color contrast is maximized to correspond with typical CMOS quantum efficiency and s/n ratio, while stray light and reflections are both substantially reduced to a level previously unheard-of thanks to extremely high transmission on all three RGB color channels made possible by extremely steep slopes on all RGB transmission curves. All around blackened lens edges with telescope-sided black outer rim serving as a filter-lead-side-indicator help to further minimize undesirable reflections. Finally, for automated imaging applications with most telescope systems, a balanced design enables coveted 1:1:1 exposure times.

For cheaper filters made by other manufacturers, one of the main causes of premature aging is the moisture accumulation stemming from micro-cracks formed around all edges. These micro-cracks develop as a result of being cut from a larger plate instead of individually coated and planeoptically polished with Reflex-Blocker™ hard coatings and Life-Coat™ sealed coating edges like Baader’s CMOS Optimized RGB Filters. Furthermore, because Reflex-Blocker™ coatings are resistant to scratching, the quality of these filters will remain high indefinitely regardless of cleaning frequency. Lastly, current standards for filter thickness are met with these parfocal filters.