Baader BCF Corrector Filter for Canon EOS Cameras - 2459213

Highlights

• DSLR Astro Conversion Filter (Baader-BCF 1)
• Planeoptically polished, with improved spectral transmission
• Fitting for all current Canon APS-C DSLR-Cameras
• List of (partly) older camera models, compatible with BCF-1 filter (no warranty for completeness):
  Canon 7D / 40D / 50D / 60D / 70D / 77D / 80D / 100 D / 400D / 450D / 500D / 550D / 600D / 650D / 700D / 750D / 760D / 1000D / 1100D / 1200D / 1300D

The moment you insert any type of filter into the optical setup, which consists of your specific camera, the appropriate flattener/reducer or coma corrector and the telescope, the filter becomes part of this unique optical system. And every optical system is different because many products from different manufacturers are involved. All optical surfaces interact with each other in some way. One possibility is that coatings of the camera reflect unwanted light back into the telescope and onto all optical elements in front of the filter. If there is no other optical surface that will reflect the light back to the filter a second time, then it is perfect. There are no halos other than residual halos or scattering, which are unavoidable, depending on the filter design. That's what we mean by our slogan "no halos, no ghosting, no reflections" on our product pages. A filter rarely produces halos itself, which are created inside the filter by internal reflections (this happened to us once in 2015, but we replaced all of these filters). Because the moment there are other surfaces near the filter, it is much more likely that light will be reflected from one of those surfaces, creating halos that...

Specifications