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Optical stuff at "reasonable prices"  try Thor Labs or Edmund Optics  Thor has always been very helpful to me.  Edmund has institutional discounts but not particularly good "help".
remember to buy the mounting hardware when you buy the optics!
Reagan Cole
Durham NC 
unaffiliated.


-----Original Message-----
>From: Jeff Courtman <[log in to unmask]>
>Sent: Feb 15, 2008 1:18 PM
>To: [log in to unmask]
>Subject: Re: Iris Diaphragm
>
>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>Tim - have you tried surplusshed.com?  might be able to find  
>something big enough to disassemble....
>	
>
>
>On Feb 15, 2008, at 2:32 PM, Tim Pula wrote:
>
>> *This message was transferred with a trial version of CommuniGate 
>> (tm) Pro*
>> ISEN-ASTC-L is a service of the Association of Science-Technology  
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>> Thank you all for the help regarding the aurora experiment. I know  
>> have a
>> few things to test and deviate from. I now have a question about  
>> parts. I am
>> looking for an inexpensive source for iris diaphragms. Something  
>> between 60
>> and 100mm diameter would work best. I am also look for something  
>> that is
>> relatively durable. I needs to last a month on the floor.
>>
>>
>>
>> Tim Pula
>>
>> Science Coordinator
>>
>> Gulf Coast Exploreum
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>> Join us each month for a new experience in the Ciba Lab.
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>>
>> JANUARY 2008 OUR BODY The Universe Within
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