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Anechoic Chamber. GH2 and Voigtlander Nokton

Discussion in 'Scenic, Architecture, and Travel' started by bullmrkt, Mar 24, 2011.

  1. bullmrkt

    bullmrkt Mu-43 Regular

    45
    Jan 9, 2011
    I took the camera out of the box, quickly applied some settings I've seen recommended here like Dynamic mode, +1 sharp, +1 saturation and shot away. They probably aren't perfect but I'm pretty happy with my first try. :biggrin:

    At or close to full open, ISO1600-3200 in the chamber, its dark. All in aperture priority mode (A). Any tips for manual lens shooting on the GH2 are greatly appreciated!

    This is Amin's Nokton by the way. Thanks for shipping quickly Amin!


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    • Like Like x 12
  2. bullmrkt

    bullmrkt Mu-43 Regular

    45
    Jan 9, 2011
    I finally figured out how to link to my SlickPic site and reconfigured the post. :smile:
     
    • Like Like x 1
  3. Spuff

    Spuff Mu-43 Top Veteran

    652
    Dec 5, 2010
    Berkshire, UK.
    Is the chamber on a rig that can be moved about?
     
  4. deirdre

    deirdre Mu-43 Top Veteran

    661
    Aug 9, 2010
    I am totally and completely in love with anechoic chambers, so thank you very much for the pictures!
     
  5. zpuskas

    zpuskas Mu-43 Veteran

    459
    Feb 25, 2011
    Santa Barbara, CA
    Having worked many years with EMI Shielding, I think you've captured the charm of the chamber!!!
     
  6. bullmrkt

    bullmrkt Mu-43 Regular

    45
    Jan 9, 2011
    :eek: that would be one large rig! No the chamber is roughly 100 x 75 feet and 75 feet tall. The reflector itself (large aluminum flower) is about 50 feet tall and weighs several tens of tons. To keep everything stable, the foundation is up to 20ft thick in some areas and the concrete piles (columns) extend 30-60ft all the way down to bedrock.

    It is part of an even larger Air Force research facility that we are renovating and adding 4 new structures to including this chamber. It's about a $65M contract.

    Thank you for the kind comments everyone!
     
  7. deirdre

    deirdre Mu-43 Top Veteran

    661
    Aug 9, 2010
    Huh, I think the largest anechoic chamber I've ever been in was a 3-meter cube. I've been in several.
     
  8. bullmrkt

    bullmrkt Mu-43 Regular

    45
    Jan 9, 2011
    Yes I believe we found that it is the second largest in the world in size, and I know it's the highest performance of any in the world with the widest available frequency spectrum. I can look up exactly what it is if anyone is interested.
     
  9. Ulfric M Douglas

    Ulfric M Douglas Mu-43 Hall of Famer

    Mar 6, 2010
    Northumberland
    :eek:What, this one? ;
    166044.
    It looks about two feet across in this pic ... I was thinking some child has cut it out of that black sugarpaper they use at school.

    ...what's it for?
     
  10. bullmrkt

    bullmrkt Mu-43 Regular

    45
    Jan 9, 2011
  11. Ulfric M Douglas

    Ulfric M Douglas Mu-43 Hall of Famer

    Mar 6, 2010
    Northumberland
    So ... the giant square sunflower is for reflecting sound back at things where only that reflected sound is wanted, rather than anything from around the area ... rightish?
     
  12. bullmrkt

    bullmrkt Mu-43 Regular

    45
    Jan 9, 2011
    Yes rightish. There is a 12 foot cube floating in the center of the chamber called the quiet zone. The EM spectrum (not necessarily sound) is reflected evenly back towards this zone. I believe the specs are 400mhz to 18ghz+. The small house in the center is where the feeder is that has a large antennae array inside. The boom is the probe that measures the interactions of the target in question at whatever frequency band they are testing.
     
  13. Ulfric M Douglas

    Ulfric M Douglas Mu-43 Hall of Famer

    Mar 6, 2010
    Northumberland
    Oh well that makes is perfectly clear ... thanks.

    Give an example of a target and feed please.