Quote:
Originally Posted by flolic
.... There is a noticeable lack of Ha regions, it seems that cheap Chinese UVIR block from ebay that I used as a optical window is completely cutting that wavelengths...
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Filip,
Which UVIRCUT did you use?
I am using Rocolax (from ebay), according to
graph supplied by manufacturer, it is supposed to pass Halpha.
Gary Honis also
sort of claims this filter is OK...
However, I am not totally convinced this is the case, I couldn't see much difference between photos taken with modified 450D+filter and my standard 60D without filter.
However, it seems Rocolax filter is beneficial when used in combination with 60D on my Canon 400 f2.8L at full aperture - stars are not bloated, but with 450D the effect is somewhat visible.