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Thread: Looking for a 40-50" mirror blank.

  1. #1
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    Looking for a 40-50" mirror blank.

    Hi:

    Well after some months looking for a good mirror blank in the 40-50" class with a reasonable price, I´m almost surrended.

    I originaly try the search in Europe. An excelent suplier who has previously help me, a lot of times, with good pyrex or suprax blanks till the 32" diameters, has fault for this project. Is not easy for him provide me a 40" or even 50" mirror form the Schott sheets.

    So this was the first dissapoinment to me.

    I tried with other suppliers but was a waste of time.

    Then I contact with USA suppliers.

    Well it is not easy too. For a blank in the 40" and 2,5" thickness they was asking for a 30.000$ and absolut irreal conditions...

    Other profesional telescope maker say that they use but can not provide a blank.

    I was a little looky with the structural and sandwich blanks, but once again with irreal prices in the 20.000$ orfer and plus. This with no mention in my afraids and phantoms with this still unsual kind of bakns. As an experiment for me is too expensive. I have worked blanks in 32" and f/3 with a lot of problems with astigmatism and out revolution figure. Other blanks even thinner was done succesfully, but with astigmatic problems.

    So, if somebody can help me for the search I will be so grateful.

    Some forgotten mirror blank in the local astronomical club, or standar supplier comunication. I star to think that they are not willing to run on theirs owens for a hot small potato in Europe and only one blank.

    I will provide more information of our project in next mail.

    Thanks for the information.

    Kind regards.

    Víctor.

  2. #2
    Member Preston Pendergraft's Avatar
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    Victor,
    Try contacting Tom Clark at the New Mexico Sky Village. He has a 48in that maybe he can hook you up with a contact. Also the co-owner of this site has a 48in and maybe he can steer you to a supplier.
    Preston
    8in Orion Skyquest XT
    10X50 Orion Resolux
    My blog updated once a month

  3. #3
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    40-50" blank.

    Hi Preston.

    Thanks so much for the information.

    I will try it.

    Regards

    Victor.



    Quote Originally Posted by Preston Pendergraft View Post
    Victor,
    Try contacting Tom Clark at the New Mexico Sky Village. He has a 48in that maybe he can hook you up with a contact. Also the co-owner of this site has a 48in and maybe he can steer you to a supplier.

  4. #4
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    Hello Mr Victor Dekert,
    Please check the box, I sent you a private message about the mirror blank.
    Regards
    Michael

  5. #5
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    Dear Victor!

    Still searching for a big blank? I ordered a Supremax33 sheet, rectangular 1200x1500x57mm last week. Maybe this sheet needs reannealing but others say it doesn't. I will know better after polishing the blank.

    -Markus
    Markus Tuukkanen
    23,4" f5.4 ServoCat Argo Navis

  6. #6
    Member Ciel Extreme's Avatar
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    Victor, did you try Canada? Optiques Normand Fullum deals with very large mirrors. I suspect you will find it expensive, but that’s the way things are nowadays. Here is the link:

    http://www.normandfullumtelescope.com/en/
    Mark Bratton
    18" f/4.5 Litebox reflector (travel scope)
    22" f/3.3 SpicaEyes Slipstream reflector (LittleTime Observatory)
    25x100mm binoculars
    “The Complete Guide to the Herschel Objects” (CUP 2011)

  7. #7
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    I got this from Schott yesterday!

    -Markusimage.jpg
    Markus Tuukkanen
    23,4" f5.4 ServoCat Argo Navis

  8. #8
    Co-Founder DSF.com Jimi Lowrey's Avatar
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    Quote Originally Posted by MakeTT View Post
    I got this from Schott yesterday!

    -Markusimage.jpg
    What Is It???
    Clear Skies,

    Jimi Lowrey
    Fort Davis Texas

    48"F4 OMI/TEC
    28'F4 ATM

  9. #9
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    It contains a standard sheet (1,2x1,5 meter) of Supremax33 glass delivered to my home As I told couple of messages earlier I ordered such a sheet , see above

    -M
    Last edited by MakeTT; May 14th, 2016 at 10:52 PM.
    Markus Tuukkanen
    23,4" f5.4 ServoCat Argo Navis

  10. #10
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    CloudyNights thread about the sheet pictured above if somebody interested..

    http://www.cloudynights.com/topic/45...irror-project/

    -Markus
    Markus Tuukkanen
    23,4" f5.4 ServoCat Argo Navis

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