If i am going to use an Ha filter in a filter wheel, would i need to remove the IDAS filter that is ahead of the FW in the light path? the IDAS filter is screwed on the back of my SCT. TIA!
Use of Ha filter
Started by bswedenburg, 02/27/2003 10:15PM
Posted 02/27/2003 10:15PM
Opening Post
Posted 02/28/2003 12:31AM
#1
IMHO, no. The IDAS passes about 92% (if my memory is accurate) at h-alpha. If you are planning to only shoot h-alpha that night, wouldn't hurt to take it off, but wouldn't make a major difference I believe. If you plan on shooting color as well that session, absolutely leave it on.
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