Light Pollution Filters.

[Marios]

Hi Guys

I am interested in making the most of good viewing weeknights in my backyard here in orange night glow Melbourne. I'm tossing up between these filters, all have raving reviews.
The good people at Baader recommend both for light pollution but the O-III specifically for CDD imaging. I also read in forums the UHC-S can effect the color of objects, while the skyglow filter can boost RGB color. Id like to hear from users of these filters.

Thank you.. :D

Baader Planetarium O-III Nebula Filter-2"

Baader Planetarium 2" UHC-S Nebula Filter-2"

Baader Planetarium 1.25" Moon & Skyglow Filter



http://www.baader-planetarium.com/pdf/filter_uebersicht_en.pdf

[Allan]

Hey Marios. I have all those filters. They are very different to each other. The OIII is about the narrowest visual OIII filter you can buy at only 10nm. On the other hand the UHC is one of the widest narrow band filters around. I haven't used my moon and sky glow yet, so can't comment on that one. But I did buy it for planetary observing, it's not a deep sky filter really.

Baader call their filter a UHC, but in reality it is closer to a broadband filter and not a true UHC as invented by Lumicon.

Depending on what filters you already have, I can definitely recommend the OIII as a good purchase, especially from a light polluted spot. But before buying the Baader UHC, I would recommend a true narrow band filter such as the Lumicon UHC or DGM NPB. I would see the Baader UHC as a subsequent purchase if you were looking for a broadband filter.

[Marios]

Thanks for the input.:thumbsup:

[cometcatcher]

For photo or visual use?

[Marios]

Just one other thing with the filters what are the pros and Cons of the clip in types vs the standard round threaded types.
The only difference I can see is having the advantage of being able to thread it on different cameras and configurations.?

[Marios]

For Photo use.

[cometcatcher]

I assume this will be for one shot colour with an astro modified 1100D? If so the Baader UHC-S will be good, Baader Moon and Skyglow is good but more wideband (gentle). Also consider the Astronomik CLS and UHC-E. If your LP is strong you may need the Astronomik UHC. Another good one is the Lumicon Deep Sky. Hutech make some good ones also.

Most LP filters will shift the colour a bit since they block the yellow/orange part of the spectrum where the sodium street lights are. They are mainly designed for nebula as they pass Ha and OIII with high transmission. As a result stars are attenuated and sometimes colour shifted. With the stronger LP filters like the Astronomik UHC, the images have a bi-colour look to them. The weaker moon and skyglow or Semi-Apo filter have a more natural look to them but less contrast boost. I don't think the OIII filter passes Ha which you need for OSC.

[Marios]

After much research last night I decided on the IDAS LPS-D1 which has rave reviews for AP and little to no color shift. Im going to thread it directly onto my 48mm Bintel prime focus adapter.

I considered the Astronomik CLS however alot people complain of strong blue's and diffculty adjusting colors in post processing.

Thanks again for taking time to reply.:thumbsup:

[cometcatcher]

Good luck with it. Post some images with it when you get a chance.

[Marios]

I will do some comparison shots from my backyard in Melborune. Someone has already done some great filter comparisons here..:..:eyepop:

http://www.pbase.com/samirkharusi/lps_cls_filters

[Don Pensack]

The bandwidth of the Baader UHC-S is so wide, it should be thought of as a "broadband" filter. The Baader O-III filter, on the other hand, is so narrow it should be thought of as more of a photographic filter than a visual filter.
Take a look at this thread:
http://www.iceinspace.com.au/forum/showthread.php?t=117915
to get some links and a better explanation.