We were told that there will be no central obstruction, and today I found pictures of the filter from their website:
http://web12.h1323703.stratoserver.net/usa/pro_info.php?ebene1=54&id=34492&catchoice1=
Yes, there's no central obstruction, but there *are* obstructions. Of course, this is kind of expected for the bigger models, however, this is not what I have expected before.
Having said that, their 50mm filter seems a real winner in terms of uniform illumination and bandpass, and it is a huge step ahead of competitions. Without the obstruction, the contrast is way better as well. And for the bigger filter models, we shall wait and see.
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