Sold -Astronomic filters for sale...

[wavelandscott]

I have two filters for sale...they have been replaced by a DGM Optics filters I picked up in the US over Christmas. While it is close and many may disagree, I give a slight edge to the DGM over the Astronomic...but it is whisker close...hence the sale.

#1 - 1.25 inch Astronomic UHC filter...new price at Bintel is AUD$ 189. I bought this new last year at SPSP... it is a good UHC filter...
Asking AUD$135 plus shipping in Australia/New Zealand. ***NOW PENDING to DavidH

#2 - 1.25 inch Astronomic CLS filter...new price at Bintel AUD$135. I bought this 2 years ago from OPT in the US. It is a "light pollution" filter. It is not as narrow as the UHC but does work well from my backyard in Sydney...
Asking AUD$95 plus shipping Australia/New Zealand.

I can post or e-mail specifications about the filters on request.
I am in no rush to sell these and would be happy to keep them...just thought I might free up a little space in my eyepiece case.

Clear Skies All!

[wavelandscott]

Lots of questions answered but no sales yet...

These filters are both still available...

[wavelandscott]

Astronomics UHC is now pending to: DavidH

Thanks!

David

CLS filter still available

[Mr. Subatomic]

I've heard a lot about how CLS filters are near-useless in dark sky sights, but I live in a very light-polluted part of sydney. Is this environment more suited for this filter? Does it mean that I'll see a more dramatic effect due to increased light-pollution compared to a dark sky sight?

[MortonH]

CLS or 'deep sky' filters are for use in light-polluted areas. At a dark-sky site, you won't get much benefit from them, so you're better off using a UHC filter instead.

I have a Lumicon deep sky filter and it does make a difference in light-polluted areas. However, it's no substitute for a really dark sky.

Morton

[wavelandscott]

While not an expert on this topic, I basically agree with Morton's comments. The CLS (or any "light pollution filter") will not make a poor observing site into a good one...

All filters block some light spectrum (some more, some less, some specific, some not so specific)...there are comparisons on websites like Cloudy Nights to give you some more detailed information (from some folks that know a lot more than me).

The CLS is a "compromise" (my words)...it is an attempt to gain some nebulosity without darkening the night sky so much that you can't see the stars...the CLS is/was "optimized" to take out more light from street lights...

The CLS will help bring out some more nebulosity in some objects at a "not dark" site (I've used mine from my backyard on a number of occassions)...it will do the same at a dark sky site...but, it is not a "magic" solution that makes viewing suddenly fabulous.

Other filters UHC, NPB OIII etc. (this varies from different manufacturers) are more restrictive in the light they let through than the CLS and you can then get even more contrast than either no filter or a less restrictive one.

[wavelandscott]

Where in Sydney do you live?

While I am overseas at the moment, I live in East Lindfield...if you want to give the CLS a try (your scope or one of mine) then let me know...just send me a PM. I get back Thursday...

[Mr. Subatomic]

I live very close to Sydney CBD in the Balmain area. The thing is that I want a fiter that will improve contrast for more than just nebulae, but also galaxies and clusters. I've read on forums and websites how LPR filters such as Astronomik's CLS don't have a significant effect and are not worth the money because of their broad transmission of light. As a solution, UHC filters are reccomended as they are much more selective in their light restriction, and hence more contrast is gained. I am just sceptical as to whether they are so selective that these other DSO objects that I also want to view will be affected, or does this only apply in dark sky sights?

[Mr. Subatomic]

by the ay, I never got around to finding out what CLS means?

[DobDobDob]

http://www.astronomik.com/english/eng_cls.html
Check it out :P

[wavelandscott]

Moderators you can now put this in the "old" section...

UHC has now sold

CLS still available...I'll post a new add some time in the future...