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OIII verses UHC


Halcyon
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I would also go for a UHC first, but your telescope could cope with a OIII very well too.

Although manufacturers call their filters UHC, OIII etc, please note that they can be quite different between manufacturers (there is not real standard..). Therefore, a Baader UHC is quite well different from an Astronomik UHC, in terms of filtered light frequencies. 

Excellent brands are Astronomik and Lumicon, but they are also pricey, particularly if 2". 

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For the larger image scale afforded by a 12" scope I would also recommend an O-III filter. You'll be able to get more use out of the larger exit pupils where it excels.

For me the the extra contrast afforded by line filters makes them winners as long as one can get properly dark adapted :)

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I have both filters. On a lot of targets, they perform about the same. But for me the OIII is the one I use most often. I saw the Veil for the first time this summer with one and it was worth the money.

John

Edited by gooseholla
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  • 2 weeks later...

Have a look at the core of the Orion nebula at around 200x magnification with the OIII.

It gives a 3D image of the dust cloud, with structure, showing light and shadow.

I was amazed the first time I saw it on a moonless night at high mag.

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When you get round to it try it on M97, the Owl Nebula in Ursa Major and, later in the year, on the Veil Nebula in Cygnus. The latter needs a really low power eyepiece as it's a large object but the O-II makes a huge difference with these objects - like "night and day" :smiley:

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