Light Pollution or Clear Sky filter?

[Lee_P]

Hi all,

I'm considering getting a light pollution filter to help with my city-based visual and astrophoto adventures, and have come across two options that suit my tighter-than-I'd-like budget:

• http://www.firstlightoptics.com/light-pollution-reduction/skywatcher-light-pollution-filter.html
• http://www.bristolcameras.co.uk/p-skywatcher-clear-sky-filter-1-25-inch.htm

I'm not too sure what the difference is between the two. Could anybody help clarify?

Thanks!

  -Lee

[cutepetgroomer]

I would lik to know the difference between the two as well

[m37]

They filter out different patterns of wavelengths of light. I think the LPR is intended more for nebulae as it has improved Ha and other wavelength transmission whereas the clear sky filter is more general purpose. It has a deeper and wider cut across 500 to 600 nm which is where a lot of the light pollution lives.

Check for some before and after shots on the interweb, should help you get a feel for it.

I would lean towards the clear sky for general purpose but the LPR for imaging nebulae. Never used the deep sky filter but looks like it might help a little with blue fringing if it bothers you in the ST102.

cheers

[Lee_P]

Thanks for the advice. I've ordered a Clear Sky Filter... fingers crossed it works well!

[LukeSkywatcher]

I have a Skywatcher LPF. I'm sure i paid more then £18 for it. It cost me about £30, from FLO. It works really well.

This is the one i have:

http://www.firstlightoptics.com/light-pollution-reduction/skywatcher-light-pollution-filter.html

1.25 format. I must be confusing my pounds and euros.

[Steve-G]

Thanks for the advice. I've ordered a Clear Sky Filter... fingers crossed it works well!

Oddly enough, I was just thinking about ordering one of these myself so would be very interested to hear how it works out for you.

[LukeSkywatcher]

In my eyes, they both seem to be the same product. Why pay £15 more for one when the other is the same.

[m37]

I think they are different in the wavelengths they allow through.

thanks

[Lee_P]

If anyone is interested, I (tried to) make a comparison here: http://stargazerslounge.com/topic/221098-attempt-at-a-clear-sky-filter-comparison/