Stacking O-III and Neodymium filters

[Jerry_K]

As an impoverished astro-senior I presently own only 2 filters, Celestron narrowband O-III and Baader IR-Cut Moon & Skyglow Neodymium filter, both are 2". The Neodymium works like magic for my LP skies with minimum loss of light. The question I have is when, how, what order (O-II 1st or Baader) and for what targets I would get most out of by stacking them. I have C6 f/10 and full spectrum moded 450D.

Anybody has experience with this? Rick? S3gell? I don't want to waste my precious imaging time by re-inventing wheel.

Thanks in advance,

Jerry

Here is link to Baader filter:

http://agenaastro.com/baader-2-moon-and-skyglow-filter.html

[astroman133]

Jerry,

 

The Baader filter blocks light frequencies that are common from light pollution.  The O III filter blocks all frequencies except the 496 and 501 mm frequencies that are emitted by doubly ionized oxygen atoms.  There is no advantage to stacking them.

[Jerry_K]

Jerry,

 

The Baader filter blocks light frequencies that are common from light pollution.  The O III filter blocks all frequencies except the 496 and 501 mm frequencies that are emitted by doubly ionized oxygen atoms.  There is no advantage to stacking them.

So, no double whamy, Rick?Which one is better for emission or reflective nebula? I have searched CA and didn't find anything.Jerry

[s3igell]

It will depend on which Nebula you target on any specific night.  Obviously, the OIII Filter will be great for OIII Nebulae, as it will isolate those emissions from almost all other light.  Most Planetary Nebulae are strong in OIII, but so is M16 and M42.  The LP Filter will be your better bet for Ha Nebulae, as it will keep the Sky Glow at bay while your Modded 450D collects Ha data.  The LP Filter will serve the same purpose for prolonging the data collection of OIII in Nebulae which have both Ha and OIII.

[Jerry_K]

It will depend on which Nebula you target on any specific night.  Obviously, the OIII Filter will be great for OIII Nebulae, as it will isolate those emissions from almost all other light.  Most Planetary Nebulae are strong in OIII, but so is M16 and M42.  The LP Filter will be your better bet for Ha Nebulae, as it will keep the Sky Glow at bay while your Modded 450D collects Ha data.  The LP Filter will serve the same purpose for prolonging the data collection of OIII in Nebulae which have both Ha and OIII.

 

I guess that best options for me is to use Baader for wide field (I have step-down rings for my lenses) and O-III for some DSOs, correct? Experience will tell.

Thanks guys,

Jerry