Jump to content

stargazine_ep34_banner.thumb.jpg.28dd32d9305c7de9b6591e6bf6600b27.jpg

Recommended Posts

How good are revolvable polarising filters for reducing light pollution and moonlight from most affected areas of sky?

Also for seeing bright objects and reducing brightness that covers near neighbouring objects?

Link to post
Share on other sites

By "revolvable" i assume you mean variable (2 part) filters. Variable polarizing filters are a bit more expensive. A single polarizing will do. You dont even need that to be honest. A single polarizing filter will do.............or just a standard Moon filter.

These will only cut down the brightness. They wont have much effect on cutting down light pollution. 

To help reduce LP, you need a light pollution filter (LPF). They help. It depends how much you can spend. 

Its a personal choice if you use a Moon filter or not. LP filters........work, depending how bad the LP is.

Edited by LukeSkywatcher
Link to post
Share on other sites

I observe mostly in a Red Zone and, frankly, I don't know any EFFECTIVE LP filter. Any polarizer is useless for LP reduction. Sometimes UHC can help but not much. As they say, the best is a "gasoline filter", when you load full tank and drive to a dark sky area :icon_biggrin:. Or wait for a moonless night.

Variable polarizer is good for closely located objects different in brightness like Sirius A and B etc.  You can cut the price by getting 2 inexpensive single polarizers e.g. from eBay or so. Attach one to a diagonal or 1.25/2 adapter (in reflector) and the other one to eyepiece, or better, to an extension tube and you can change eyepieces on the go.

 

 

  • Like 1
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Anthony RS
      Hello,
      I'm selling these 2 filters since I'm getting a mono astro cam. The filters are barely used and in perfect condition, no scratches, no fingerprints, not even dust. They are both amazing filters, probably the best investment I've made. I've attached some images
      taken with these filters, using a 100$ celestron newtonian, a 250$ Canon 500D and the infamous AVX. Also attached are images of the filters showing their perfect condition.
      Astronomik CLS-CCD Canon Clip in Filter: https://www.astronomik.com/en/filter-gegen-lichtverschmtzung-filters-against-lightpollution-lpr/cls-ccd-filter/clip-filter-eos-mit-astronomik-cls-ccd.html
      Original price including VAT is 155 Euros (around USD 182). I got it for around USD230 including VAT, shipping and custom taxes.
      Selling for USD 100.
      Astronomik Ha 12nm Canon Clip in Filter: https://www.astronomik.com/en/clip-filter/clip-filter-canon-aps-c/clip-filter-eos-mit-astronomik-h-alpha-ccd-12nm.html
      Original price including VAT 194 Euros (around USD 228). Got it for around USD 270 including VAT, shipping and custom taxes.
      Selling for USD 150
      I am willing to ship them on my own expense using LibanPost (from Lebanon). Shipping might take time; if you would like to use some other shipment method please contact me to discuss the price. 
      Feel free to buy one or both together.
      Let me know if you have any questions. 
      You can also contact me on <private email address removed>
      Cheers,
      Anthony









    • By wavydavy
      Originally brought for my C11 HD Edge, which its made for, but if used with filter wheel, OAG, and 0.7 focal reducer the spacing is to far out, hence the reluctant sale of this A+ Condition, unused (other than to see if it worked) focuser. The price includes special delivery. Bank transfer, paypal is ok, or cash/collect...ect... The price is £200. This would be great for planetary imaging, imaging without using an OAG, bringing the travel closer. Thanks for looking.




    • By msoulby
      Hello, 
      Unfortunately, I will be moving from my Bortle class 3/4 skies overlooking the Cotswolds, to somewhere with class 6 skies 😫
      Does anybody with any local knowledge around the Stotfold area have any observation site suggestions? Away from any local light pollution at least. It would seem driving east maybe productive according to https://www.lightpollutionmap.info
      Thanks
      Mike
    • By mih
      Hi, I'm a beginner and I want to buy something for my telescope. I have a Bresser 6 inch Newtonian(750mm focal length) I have 2 lenses, 9mm, 25mm, a moon filter and a 2x barlow. What would be the next thing to get? I was thinking maybe a solar filter, a light pollution filter since i am stuck at home, idk. What are your thoughts on this?
    • By kryptonite
      I'm not experienced with LRGB imaging, so thought i'd give it a go on M81. However, when i combine the 4 individually processed integrations i end up with horrible colour hues across the image - they're all aligned and wotnot. Am i running into the issues of light pollution (inside the M25), which i can only remove with aggressive DBE application?  Individual files attached.




×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.