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Old 30-09-2009, 07:18 AM
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telecasterguru (Frank)
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DSLR and Ha

Sorry if this has been asked before, but I am thinking of having my 350D modded and then I want to purchase a Ha clip in filter for it.

Is there a benefit in having the camera modified if I want to use a Ha filter in it or am I better off leaving it unmodded?

Thanks

Frank
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Old 30-09-2009, 07:52 AM
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[1ponders] (Paul)
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You are definitely better off having it modded because of the increased red sensitivity and Ha is well inside the normal filter cutoff point. But having said that you will still only have 1 in 4 pixels recording the Ha. The baayer matrix isn't removed so the groups of 4 pixels that read RGGB will still only read RGGB so it will never give you the resolution a pure mono chip will.
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Old 30-09-2009, 09:44 AM
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telecasterguru (Frank)
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Paul,
Thanks for the information but just one more question, should I have the Baader filter added to the camera or leave it without a filter?

Frank
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Old 30-09-2009, 10:29 AM
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[1ponders] (Paul)
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I like to use a UV/IR filter on mine. Whether its my imagination or not I don't know, but I believe that using one helps to keep the stars tighter by preventing IR from saturating pixels too quickly.
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Old 30-09-2009, 10:31 AM
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[1ponders] (Paul)
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btw mine only has a glass cover replacement over the chip, i use the filter attached to my Focal Reducer or have them protecting the front of my widefield lenses. I see real value on adding them as the replacement for the existing filter unless you want to do IR imaging which a number of people here have done.
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Old 30-09-2009, 08:12 PM
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telecasterguru (Frank)
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Thanks for the info Paul, that's what I will do.

Frank
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Old 30-09-2009, 08:41 PM
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MrB (Simon)
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Paul, have you ever experienced the 'checkerboard' problem as descibed here?
I was going to replace the filter on mine with glass, but after reading that site decided to err on the side of caution and go for the Baader.
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Old 30-09-2009, 09:07 PM
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[1ponders] (Paul)
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No I haven't but i'll check to make sure that mine was just a glass filter.
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Old 01-10-2009, 08:51 PM
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[1ponders] (Paul)
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I've just checked and I was mistaken. My camera has the UV/IR filter already installed. So I guess I'll have a redundant 2" UV/IR filter up for sale soon.
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