Baader Semi Apo Filter 1.25″

SKU: BAA2458398 Categories: Baader Planetarium, Filters, Telescope Accessories

A screw in filter to your eyepiece combining two popular filters
- Fringe-Killer with Moon & Skyglow filters
Delivers amazingly colour corrected images
Drastic contrast enhancement for all telescopes, without loss of image brightness
Provides the brightest image of all industrially produced colour error correction systems
Fringe Killer is a must for even the smallest telescopes.

$149.00 inc GST

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Manufacturer	Baader Planetarium
SKU (#)	2458398
EAN Code	4047825009340
Net weight (kg)	0.06
Transmission Range	multiple bands (see spectral image)
Filter Thickness (without cell)	1 mm
AR-Coating	Phantom Coating® Group, planeoptically polished
Filter size	1 25 inch
Filter Usage	CCD, Color Correction, IR-Cut
Filter mounted	Mounted (LPFC 6mm)
Type of Filter	Bandpass
Single or Set?	Single Filter
Filter shape	round

Selective contrast filter, especially suitable for all reflector telescopes
Filters out specific wavelengths, especially those caused by streetlight and most importantly their scattered light which lightens up the night sky
Selective blocking retains natural colours intact but with RGB significantly enhanced, differences in colour and brightness persist.
95% transmission in the selected spectral range.
Fits all standard filter threads and can be combined with other filters – e.g. the planeoptically
polished (!) Baader planetary colour filters. This way, you can see fine details better or combine several images with a monochrome camera to achieve colour images.
The filter is at the same time optimised for Astrophotography due to it‘s full UV/IR-blocking coating. When used with DSLRs, stars will remain much tighter, because the unfocussed UV and IR parts of the spectrum are blocked out.
Planeoptically polished; can be used without problems in front of a binoviewer or for afocal photography – far away from the focus without loosing sharpness!
The fine-optical polish and absence of wedge error in the glass ensure perfect sharpness when magnifying more than 200x – while the much cheaper “fire -polished” filter glasses destroy the optical wavefront at high mags

The fringe killer blocks defocused light in the blue spectrum, as well as in the red part of the spectrum (IR) above 700nm, usually seen in small achromat telescopes.
The smaller details on craters of the Moon and planetary surfaces are so much more visible!
Planeoptically polished; can be used well before the focal point of the optical system, without any loss of sharpness, as a single filter in front of a binocular for afocal projection with digital cameras.
Provides the brightest picture of all industrially manufactured colour error-correction systems. Thus, the Fringe-Killer is a must for small refractors!