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Hello,

I have a question about filterwheels; SBIG filter wheels specifically. As far as I know they are the only ones that really use the 8 position filter wheels. So I have it loaded with L, R, G, B, Ha, OIII, and SII. So that is seven filters, what goes in the 8th slot???

Thank you for your insight,
Christopher

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There is a C filter, which is like the L but with (without?) the IR block (can't remember which way round they are).

Some people also have a special IR-pass filters for imaging the moon and planets. And some use a set of UBVIR filters for photometry.

There are also other less usual filters. I have a CH4 filter for (particularly) Jupiter & Saturn. I also have an NE3 filter for (particularly) planetary nebulae.

So that's another nine options ...  where can I get a 16-position filter wheel :biggrin:?

  • Haha 1

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If you've never felt the need for it forget it!

:Dlly

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I could use an 8 position wheel for my Trius camera, for LRGB, [SII]. [NII], HII, [OIII]. Baader LRGB, plus a full set of 3nm Astrodons. As it is, I either have to lose the L filter, or else one of the NB, usually the [SI].

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Just curious, having just started imaging with a DSLR, and having a long way to go before I'm ready for mono cameras and filters.

Would you need all 8 filters in one session, or do you just keep all your filters loaded and control which ones to use in a given session ?

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No, the most you'd need is R, G, B if you were going to cycle through them during the course of a session, any L data would be added separately The reason for loading up the wheel is to have all your filters in one place, and hopefully not gathering dust, something they can do with alarming ease.

A narrow band session would likely use only one filter at a time, to gather as much signal as possible.

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Keep them loaded and use what you need.  Although it is not uncommon to use LRGB in rotation (LLLRGB LLLRGB,  etc).

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A dark filter would be handy if you are using the gear remotely and need a new set of darks.. :)

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