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Orion Ultrablock filter - issues

Siegfried1969
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Louis D

Louis D

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Posted

Without running your Orion Ultrablock filter through a spectrograph or optical spectrum analyzer, it's hard to say what's wrong with it.  My guess based on your latest comparison is that it is left shifted and is only passing H-Beta and no OIII bands where M42 is brightest.

My cheap Svbony UHC has a wider passband than my 1990s Lumicon UHC, but the view of M42 is surprisingly similar under Bortle 6/7 skies.  M42 has enhanced contrast with both filters without unduly dimming nearby stars.  For under $20, the Svbony UHC comes highly recommended for those on a tight budget.

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Stu
Stu

Can I ask what magnification you are using? With small scopes, you need to keep the exit pupil size up with these filters or the view does get too dark. Somewhere around 4mm and above would be good wh

jetstream
jetstream

I have numerous top filters now, including an older but great Lumicon UHC and also the NEW Televue Nebustar. Forget about Lumicon now. Buy the latest Astronomik tight UHC or the Televue (mad

jetstream
jetstream

I dont mean to be rude here. I had an Orion Ultrablock years ago and had the same experience. It tainted my view of filters to the point that I thought all UHC types dont work very well. I was new at

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