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Thread: thousand oaks oiii filter ?

  1. #21
    rory's Avatar
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    Default Re: thousand oaks oiii filter ?



    Quote Originally Posted by j.gardavsky View Post
    Hello Rory,

    sorry for your bad luck with the Thousand Oaks, but don't bin it in.
    It would be quite interesting to inspect what has happened to the filter, looks like a problem that might have emerged after the wet cleaning, not totally unknown also with the Lumicon filters.

    Should you part from this filter, I'd might be interested to get it for a closer inspection.

    Best,

    JG
    JG , is there a solution for returning the filter to a better state ?
    If not perhaps I could pass it your way if you feel you can make use.
    I shall place up a photo later .
    Best Rory.

  2. #22
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    Default Re: thousand oaks oiii filter ?

    Quote Originally Posted by rory View Post
    JG , is there a solution for returning the filter to a better state ?
    If not perhaps I could pass it your way if you feel you can make use.
    I shall place up a photo later .
    Best Rory.
    Hello Rory,

    you can try to use the filter as it is, check its performance on the M42 in Orion. When o.k., then you can keep it, if you have already purchased it.
    You can also try to dry away the rings by an infrared lamp, but you'd take a risk of destroying the multilayers.
    In any case, post a photographic documentation of the rings on the filter, including the series number, if any on the filter rim.

    I would be of course interested to check this filter with my microscopes, and with my DIY spectroscope, returning the filter back to you after the inspection.

    Best,

    JG
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    Default Re: thousand oaks oiii filter ?

    002.JPGif im lucky enough to get a break in the clouds ill try it out properly. the reason I think its a gonna ,is that I get different colours from different areas of the surface.
    but anyway heres a pic .you only see the circles if you hold up to light obviously . ordinarily it appears normal /mirror like.

  4. #24
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    Default Re: thousand oaks oiii filter ?

    Thanks Rory for the pic.
    Now, the next question arises. Can you unscrew the thread, and take the filter out, in order to inspect the rim of the filter glass.

    Best,

    JG
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    Default Re: thousand oaks oiii filter ?

    I can jg . would you want a pic of that also ?

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    Default Re: thousand oaks oiii filter ?

    003.JPGthe edges seem and feel a little rough with small pit marks.

  7. #27
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    Default Re: thousand oaks oiii filter ?

    Thanks Rory.

    Can you check, if the filter is sandwitched from 2 glass plates? If yes, take a pic, please.

    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: thousand oaks oiii filter ?

    002.JPG

    I can see a thin join line under a grey coating. you can just make it out in the photo JG.
    I took it out to try it earlier, but didn't have great conditions to work with. what I did see was the same as what id viewed without a filter except the green hint you get with these. the nebula didn't seem to extend any further than when unfiltered. I must stress though I wasn't in a good dark location ,and I understand you need this to REALLY let these oiii 's do there stuff.

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    Default Re: thousand oaks oiii filter ?

    As I understand it, what you want visually in an O-III filter is >90% transmission at the 496nm and 501nm O-III lines in the spectrum and very little else.
    That means one can classify O-III filters as:

    Too wide: Meade, Orion, Astronomik, Andover, IDAS, TeleVue. These hit the 2 lines, but have too much in the way of other wavelengths allowed for maximum transmission. They might be OK in small apertures, though, despite the reduced contrast, due to a brighter overall field image.

    Too narrow: Baader, Celestron, Custom Scientific, Optec. These pass only one of the 2 O-III lines, and so, may be better as photographic filters than visual filters. They would work well IF one knew all the energy in a particular nebula was at the 501nm line and not the 496nm line.

    In error for wavelengths passed: Thousand Oaks, DGM. These not only miss one of the 2 lines needed, but also have too wide bandwidths. With a shift in transmitted wavelengths, these would be top-quality otherwise.

    Just right: Lumicon, Telescope Service. These have nearly ideal bandwidths and transmit both O-III wavelengths.

    Not mentioned: Denkmeier, KSON, Antares, Astrotech, ICS, LMDA,OPT, Optical Solutions, Orbinar, Zhumell. Tests for these seem scarce and manufacturer's curves aren't easily available for comparison.

    Source for mfr's details:
    http://www.karmalimbo.com/aro/pics/filters/o3a.jpg
    http://www.karmalimbo.com/aro/pics/filters/o3b.jpg

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  12. #30
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    Default Re: thousand oaks oiii filter ?

    Quote Originally Posted by Don Pensack View Post
    As I understand it, what you want visually in an O-III filter is >90% transmission at the 496nm and 501nm O-III lines in the spectrum and very little else.
    That means one can classify O-III filters as:

    Too wide: Meade, Orion, Astronomik, Andover, IDAS, TeleVue. These hit the 2 lines, but have too much in the way of other wavelengths allowed for maximum transmission. They might be OK in small apertures, though, despite the reduced contrast, due to a brighter overall field image.

    Too narrow: Baader, Celestron, Custom Scientific, Optec. These pass only one of the 2 O-III lines, and so, may be better as photographic filters than visual filters. They would work well IF one knew all the energy in a particular nebula was at the 501nm line and not the 496nm line.

    In error for wavelengths passed: Thousand Oaks, DGM. These not only miss one of the 2 lines needed, but also have too wide bandwidths. With a shift in transmitted wavelengths, these would be top-quality otherwise.

    Just right: Lumicon, Telescope Service. These have nearly ideal bandwidths and transmit both O-III wavelengths.

    Not mentioned: Denkmeier, KSON, Antares, Astrotech, ICS, LMDA,OPT, Optical Solutions, Orbinar, Zhumell. Tests for these seem scarce and manufacturer's curves aren't easily available for comparison.

    Source for mfr's details:
    http://www.karmalimbo.com/aro/pics/filters/o3a.jpg
    http://www.karmalimbo.com/aro/pics/filters/o3b.jpg

    Don Pensack
    Los Angeles
    ok, so that explains WHY i got the 2" Thousand Oaks OIII so cheap....crap...three steps forward, two steps back....the learning curve is steep, AND expensive.....I will never give, or take casual advice again....<repeat 100 times>, then auction filter off on EBay...Jeeezuz....

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