Results 1 to 6 of 6
  1. #1
    Michael McCulloch's Avatar
    Michael McCulloch Guest

    Default Thousand Oaks vs. Lumicon nebula filters



    Are the Thousand Oaks H-beta and OIII filters considered equivalent in
    performance to the Lumicon versions?

    I have noticed some slight focusing issues with the Lumicon filters as
    it seems stars in the field do not focus to a sharp point when using
    the Lumicon UHC.

    The Thousand Oaks filters are also about 20% less expensive. I also
    like the idea of different colors for the filter rings to aid in
    id'ing them in the dark.

    ---
    Michael McCulloch

  2. #2
    Dan McShane's Avatar
    Dan McShane Guest

    Default Thousand Oaks vs. Lumicon nebula filters


    "Michael McCulloch" <michaelm@nospam.invalid.net> wrote in message
    news:efqrpvo29qmivsdspb113o0qtm256drnk8@4ax.com...


    Hi Michael,

    Lumicon and several other makers use laminated soft film designs which
    require that the film (layers) be sealed in a cover plate so the film
    doesn`t degrade. If the cover or main plate has any deviations, dimples,
    striations, etc, or the epoxy is contaminated the plates don`t sit parallel
    and there can be bothersome internal reflections or even double images.

    It`s ironic in that Lumicon urges users to "not settle for cheap,
    foreign-made imitations" when they use the same technology! (although not
    foreign made AFAIK).

    Dan McShane
    www.dgmoptics.com
    http://users.erols.com/dgmoptics/LPRfilters.htm



    ---
    Outgoing mail is certified Virus Free.
    Checked by AVG anti-virus system (http://www.grisoft.com).
    Version: 6.0.530 / Virus Database: 325 - Release Date: 10/22/2003



  3. #3
    Eddie Kirkland's Avatar
    Eddie Kirkland Guest

    Default Thousand Oaks vs. Lumicon nebula filters

    I have a 2" Thousand Oaks O-III and am very pleased with it.

    Eddie

    "Michael McCulloch" <michaelm@nospam.invalid.net> wrote in message
    news:efqrpvo29qmivsdspb113o0qtm256drnk8@4ax.com...



  4. #4
    Shneor Sherman's Avatar
    Shneor Sherman Guest

    Default Thousand Oaks vs. Lumicon nebula filters

    "Eddie Kirkland" <kirkland5245@earthlink.net> wrote in message news:<LWCnb.7959$X22.223@newsread2.news.atl.earthl ink.net>...
    See this site for accurate informatiom about filters:
    http://home.freeuk.com/m.gavin/grism2.htm
    Precise spectroscopic measurements for just about all brands and types...
    Clear skies,
    Shneor Sherman

  5. #5
    Michael McCulloch's Avatar
    Michael McCulloch Guest

    Default Thousand Oaks vs. Lumicon nebula filters

    On 29 Oct 2003 07:32:16 -0800, shneor@my-deja.com (Shneor Sherman)
    wrote:


    Thanks! Hmm, the Thousand Oaks misses one of the OIII emission lines.
    I wonder if that results in more contrast, but darker images in
    practice. Since I already have the Lumicon UHC, perhaps the Thousand
    Oaks OIII would yield a bigger difference than the Lumicon OIII on
    certain objects. I have a 12.5" f/5 newt.

    The Lumicon H-beta also looks quite good -- centered on the H-beta
    emission line with complete rejection of OIII.

    The Televue OIII is not very narrow in the passband at all. It looks
    more like the Lumicon UHC.

    ---
    Michael McCulloch

  6. #6
    Jeff Kurtz's Avatar
    Jeff Kurtz Guest

    Default Thousand Oaks vs. Lumicon nebula filters

    I went through the same thought process when buying my OIII
    filter...in a side by side comparison I couldn't see any difference
    visually between the Lumicon and Thousand Oaks OIII filters...I bought
    my Thousand Oaks filter from Adorama in NYC they discount them as
    well. It's interesting, in the spectrograph both filters appear very
    similar.




    Michael McCulloch <michaelm@nospam.invalid.net> wrote in message news:<eisvpvo4v8vlaorouieo09rcm4tfmd4i3d@4ax.com>. ..

 

 

Similar Threads

  1. Thousand Oaks Glass Solar Filters
    By admin in forum Solar Viewing Forum
    Replies: 10
    Last Post: 06-25-2010, 01:27 PM
  2. Thousand Oaks H-alpha
    By Thomas in forum Amateur Astronomy Forum
    Replies: 12
    Last Post: 06-27-2006, 09:27 PM
  3. thousand oaks narrowband
    By Magnus Edinger in forum Amateur Astronomy Forum
    Replies: 8
    Last Post: 10-13-2003, 06:40 PM
  4. Replies: 1
    Last Post: 08-02-2003, 10:58 AM
  5. OIII spectrum test of Lumicon, Thousand Oaks & TeleVue filters etc
    By Maurice Gavin in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 07-30-2003, 08:54 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 07:27 PM.