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Best LP filter?

blusky

By blusky
in The Astro Lounge

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E621Keith

E621Keith

Posted
Posted

I gathered the best broadband LP filter is the IDAS-LPS filter.

Hutech Light Pollution Filters - SCS Astro

Also check out these review

http://stargazerslounge.com/member-equipment-reviews/123626-comparison-3-light-pollution-filters.html

http://stargazerslounge.com/member-equipment-reviews/65445-light-pollution-filter-review-part-1-a.html

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  • 3 weeks later...
Merlin66

Merlin66

Posted
Posted

The issue with LPR filters is they all work by suppressing all (hopefully) the unwanted light. The "gaps" that this subtraction process causes in the spectrum will give some colour shift...if it doesn't then the filter is not working!

The filter you use should suit your light pollution ie if you have the newly installed LED lamps, then nothing will block the light - they are effectively a broad full spectrum emission source. The traditional mercury/ L and H pressure Sodium can , to a point be suppressed. It's very easy to check your filter; either with a small direct vision ebay spectroscope, or by just looking through it at your nearby lights - if they appear much dimmer, then the filter works for you.

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E621Keith

E621Keith

Posted
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ie if you have the newly installed LED lamps, then nothing will block the light - they are effectively a broad full spectrum emission source.

Not all LED lamp are broadband white light. Instead many emit three very sharp peaks in R G and B. The human eye see them as broad band white light, but in reality they are not. Traditional LP filter won't work, because the peaks' positions can be set by the manufacturer and are variable, but narrow band filters should work.

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welshrob87

welshrob87

Posted
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Been thinking about a Neodymium filter as we have street lights near the house. They're not LED so assume that this filter would work with them. Does anybody know if there is any difference between the Baader branded filter (First Light Optics - Baader Neodymium Filter) and the one available from sky's the limit (1.25" Moon & Skyglow Neodymium Planetary Filter - Visual or CCD | eBay

There isn't any difference in price really but with the recent supply problems with the Baader filter it might be a good alternative.

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gooseholla

gooseholla

Posted
Posted
Been thinking about a Neodymium filter as we have street lights near the house. They're not LED so assume that this filter would work with them. Does anybody know if there is any difference between the Baader branded filter (First Light Optics - Baader Neodymium Filter) and the one available from sky's the limit (1.25" Moon & Skyglow Neodymium Planetary Filter - Visual or CCD | eBay

There isn't any difference in price really but with the recent supply problems with the Baader filter it might be a good alternative.

It tells you in the description:

"One of our suppliers has been able to send over some of these filters with the description that the filter is "like" the Baader moon and skyglow filter. We asked how "like" is it and the reply is that is " it means that our filters have the same curve of coating and optic with the Baader and Astronomik" - so now you know. By curve we interpret that as meaning characteristics of filtering"

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