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Crt Lenses

Discussion in 'Projectors, Screens & Video Processors' started by MATT JENNER, Aug 21, 2002.

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  1. MATT JENNER

    MATT JENNER
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    HI All

    i would ike to know where you can obtain 2nd hand glass lenses for my Ellie xs3000 ht.
    I know i can get new ones but i am wondering if it is worth saving a few coppers for a set of 2nd hand ones.
    Also apart from the loss of the blue halo you sometimes get with the plastic high definition lenses, what are the benefits of glass over the plastic ones ?

    thanx again

    matt
     
  2. Rob

    Rob
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    If you can pick up a set of HD-6s, you would see a significant improvement over the standard plastic ones. I did this to my old Seleco 320 and the difference was considerable.

    You could give www.crtprojectors.co.uk a try. They have some second hand stuff. The good thing about a lens upgrade is that, providing you don't pay over the odds, they will always hold thier value, and could always be sold seperately if necessary.

    Rob.
     
  3. Roland @ B4

    Roland @ B4
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    I normally have these in stock but have run dry just now. HD6 or HD145 lenses will bolt right on.

    I'll have some in about two weeks if you can wait.

    Fancy some solid glass X22 lenses? now were are talking sharp.
     
  4. MATT JENNER

    MATT JENNER
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    thanks guys,

    what are some of the prices of these lenses
     
  5. Messiah

    Messiah
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    Extract from crtprojectors.co.uk accessory page

    "HD-6 Glass Lenses to up-grade cheap plastic lenses that won't focus on Seleco and other projectors, from £449.00 per set. Various other glass lenses available, including special application models. Email for details and pricing."

    Might be worth popping over if you can't wait for Roland's.
     
  6. MATT JENNER

    MATT JENNER
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    thanx guys for the advice,
    could someone answer my original question,
    what are the benefits of glass lenses over the standard high definition plastic ones ?

    and what is the difference between the different glass lenses etc
     
  7. bxd

    bxd
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    Matt,

    You have a pm.

    Brian.
     
  8. Roland @ B4

    Roland @ B4
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    Right lets get this straight. The differnce between glass and Plastic lenses on CRT.

    Each manufacturer assesess the performance of their machines and matches the lenses accordingly.

    The so called PLASTIC lenses (eg TAC4) are genrally fitted to machines that were designed to just show video at its standard resoloution. 625 line 15Khz. They were optimised for light output not resoloution. Plasic is not a very good bender of light it therefor tends not be be able focus as efficiently (They were also cheap)

    GLASS
    To my knowlege there have been no projectors available with ALL GLASS lenses for about 10 years now.
    They are a HYBRID Lens with a mixture of glass and plastic elements. Solid glass lenses would be wonderfully sharp but not very bight. With a Hybrid lens you get the best of both worlds.(EG HD6, HD145)

    The advantage of the Hybrid lenses are that they offer increased resoloution and focus over their Acrylic bed fellows. the disadvantage is that they will also reduce the light output by as much as 10%. They may also show limitations in the performance of the projector. Unless you are running line doubled or above I would stick with plasic lenses they will give the advanges of softening out the scan lines

    When I have them £300 ish for HD6 lenses is what I would expect.
     
  9. MATT JENNER

    MATT JENNER
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    thanks rolie,
    i have the xs 3000ht, which has a line tripler, so the hd145 lenses i would be interested in, the next question is , as i am a novice at technical stuff like this, how the hell do you fit them ?
    do you know of anyone that offers a fitting service ?
     
  10. Rob

    Rob
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    Matt,

    They are not difficult to fit, 4 bolts on each lens, just a matter of unbolting each lens and swapping over. You will probably need to make some minor video adjustments though.

    I was concerned that fitting HD-6s to my old Seleco would increase the visible line structure, as it was only a standard 16Khz video grade machine. I can't sat I noticed any difference in that respect, but the picture was noticeably sharper and colours had definetly improved.

    £300 is a very good price for a set. To buy new they are (or were) around £700 each. A very worthy upgrade.

    Rob.
     
  11. MATT JENNER

    MATT JENNER
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    CHEERS ROB,
    I have managed to get hold of a good set of HD145 for 550.00
    i will fit them tomorrow.
    thanx for help

    Matt
     
  12. Rob

    Rob
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    £550 for a set of HD 145s is great. Seleco use these on thier top model, the SVP-800. I had the chance to buy a set of these when I bought my HD 6s, but I don't think I would really have seen the extra benefit on my 320.

    Rob.
     
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