Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.


Recommended Posts

Heyyy its meee kronos and i have been wondering about getting a filter...I really want the best contrast and brightness i can on my nebulas(i want to view M42 M57 M27 M31  M81 M82 and lots more) with my future 8" dob. Is this filter really going to help me?


If it just a matter of quality of the filter itself  can you suggest a better one in the same price range?

Or will not the uhc filter help me in general .IF so can you reccomend another one?

Also is this         https://www.firstlightoptics.com/uhc-oiii-visual-filters/uhc-filter.html         this       https://www.firstlightoptics.com/uhc-oiii-visual-filters/es_uhc_filter_125.html        https://www.firstlightoptics.com/uhc-oiii-visual-filters/baader-uhc-s-filter.html               this better?

Edited by Kronos831

Share this post

Link to post
Share on other sites

UHC filters are very useful for viewing emission nebulae so great for M42, 27, 57.  They let through OIII and Ha whilst cutting out a significant amount of light from other wavelengths.  A UHC filter doesn't help with broadband targets such as galaxies.  Whilst they will block sodium street light glow they will block some wavelengths useful for broadband targets.  

Share this post

Link to post
Share on other sites

The best budget filters are probably the Castel brand but FLO dont stock those. The Orion Ultrablock and the Telescope Services UHC are also good UHC filters that don't cost too much. The Explore Scientific ones might be OK as well.

These deep sky filters are not all to the same specification in terms of band pass width (odd but true) so you need to do some research because some will perform better than others.

Personally, faced with a choice of just the ones you list, I would probably go for the Explore Scientific O-III filter to use with a 200mm dobsonian.


Share this post

Link to post
Share on other sites

hmmm intresting.. just to understand. Why not get the uhc filter instead of the OIII as the UHC also lets OIII and H wavelenghts get through?
Also which is best for Orion's nebula The dumbbell nebula the ring nebula ,hercules global cluster and maybe some other galaxies?(my most gonna-be viewed objects)

Sorry for asking. Its just one of you suggested the UHC where as the other Suggested OIII so i am really keen to find the difference between the 2 to broaden my knowledge about filters in general


Edited by Kronos831
EDIT* Orion nebula is my priority*

Share this post

Link to post
Share on other sites

It's the wavelengths that are not admitted by the filter get through that make the difference.

I prefer an O-III where just the O-III line is permitted by the filter because it makes a really big impact on some objects. Most of the ones that you list I prefer to observe without a filter. A UHC does make some difference to them though.

You will find that different people offer different opinions because experiences and preferences vary.

The link that Gerry/Jetstream has posted is worth a read. I've also attached a good piece on them:


I know you are in a hurry to purchase but it is worth understanding how these things work.



Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By redhat
      Hello everyone,
      Bit of a backround: I've been a keen stargazer when in my teenage years, then couldn't pursuit my passion, but recently, in my forties, it hit me again, as I moved  and life is good (South facing large garden, obstructed only from the North by our house, but then I just move the scope further and viola!). Started with 90mm refractor, but was always thinking of reflector.
      Long story short, I've got my SkyWatcher Star Discovery 150P GOTO a week ago. Bought it second hand, very good condition, and good mirror. Have got two nights stargazing, cought cold and I AM LOVING IT.
      Now I would like to get me a nice wide angle ep for DSO spotting.
      The scope is 150mm / 750mm f5. I've done some reading obviously, and Explore Scientific 82 degree series have all good reviews and fit within my budget. I can afford only one, and apparently  the best for DSOs is the one that gives 2mm exit pupil. Now, for my scope that would be 10mm piece, and that is not within ES 82 degree range, so it's down to 11mm (2.2mm exit pupil) or 8.8mm (1.76mm exit pupil).
      My question is: which one would be better for my rediscovered passion? I'm gonna be using that ep for faint mostly.
      Thanks to  everyone in advance for any kind advise.

    • By ruskclark
      The Wizard Nebula
      An emission nebula 7,200 light years away and my first proper project of the new imaging year. 
      Really happy with it as I’ve had a steep learning curve with new kit so really pleased to see this image come together. It’s also the first time I’ve imaged it. 
      72x180s subs collected over 2 nights 24/25th August in my Bortle 7 back garden, Whitley Bay, England
      Calibrated with darks, flats and dark flats in DSS and processed in SiriL and Photoshop. 
      Lacerta 72mm f/6 APO
      ZWO ASI1600MC Pro at -15C gain 200
      iOptron CEM25p
      ZWO 60mm guide scope
      ZWO ASI120MM-S guide camera
      Altair Astro 2” Tri Band OSC Filter
      Data collected in APT and guided with PHD2

    • By jjosefsen
      I'm working with some recent data of a new(ish) camera, and my Ha data is pretty good, but the oiii has these strange artifacts around the borders.
      If I use any kind of local normalization then it pretty much ruins most of the image, as you can see below..
      First the Ha:

      Oiii with local normalization:

      oiii local normalization map, see how it fits with the artifacts:

      Oiii without any local normalization:

      These edge artifacts, could they be related to a bad filter or is it a processing artifact, has anyone seen anything similar?
      I am using Astro Pixel Processor for calibration and stacking.. Im kind of stumped on this one, and I am going to yank out the Oiii filter this weekend to have a looksie.
    • By MarsG76
      The Omega Nebula, aka The swan Nebula, M17/NGC6618 imaged in Narrowband and combined in Hubble palette style. The photo was imaged with a astromodded and cooled DSLR through a 8" SCT across multiple networks gets from 28 July - 8 August 2019.
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.