If you have a Canon EOS 5D, 6D, or the newer 6D MKII full-frame DSLR and want to use it for astrophotography to capture more detail in nebulae, then the Baader Planetarium BCF 2 Full Frame conversion filter is what you need.
Baader BCF 2 filter provides the camera sensor with a much better spectral transmission window, especially in the H-alpha region where many nebulae emit. The filter replaces the manufacturer’s sensor filter so the original one needs to be removed. There are some online guides on how this is done, but there are some companies that offer this service if you feel the “DIY” route is not for you.
The image below shows an APS-C size camera with a Baader filter and the original Canon filter side by side in front of the camera. The two images behind the camera shows the benefit of using a BCF filter over the original filter – much more nebulosity can clearly be imaged and seen (left image).
If this filter is of interest to you – then its time to get one NOW! As soon as stocks of these filters sell out they are gone! No more will be available. So hurry while stocks last.