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Old 27-09-2016, 08:26 AM
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bojan is offline
Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 6,132
Originally Posted by flolic View Post
.... 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...

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.

Last edited by bojan; 27-09-2016 at 07:55 PM.
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