cheap emission filters for CCD work

[Rocket Pooch]

Look at the price of the O-III etc

http://www.dhinds.co.uk/pages/browse.php?id=11&nowstage=1&nowpage=2

[Whitters]

You do need to check that the filters are suitable for use with CCD imaging. If they don't filter out IR then you wou't be able to get the best focus. You could double them up with an IR block though.
For visual work this is not a problem.
I would also like to see a diagram of the transmission curve for each filter.

[Rocket Pooch]

Hi Paul,

At £48 for an OIII even if I have to put the IR on its not going to be a big effort, just need a SII now.

The Astronomik IR cuts from 680nm up.

OIII Baader, exactly the same emission as the Astro OIII

http://www.alpineastro.com/filters/O-III_Curve.htm

UHC-S I believe I'll need to IR with this.  Leaving Ha and Hb & OIII might make a cheapy LPR filter with the IR.

http://www.alpineastro.com/filters/uhc_filter_curve.htm

This is My LPR filter spec: -

<1% 405nm Hg
<1% 436nm Hg
95% 486nm Hydrogen-Beta
94% 496nm Oxygen III
95% 501nm Oxygen III
<4% 546nm Hg
<2% 570nm Na2
<2% 579nm Hg
<2% 583nm Na2
<2% 600nm Na2
95% 656nm Hydrogen-Alpha

I use this with the IR to cut off IT for the CCD.

Chris

[ This Message was edited by: csuddell on 2004-11-27 15:30 ]