Re: [ATM] webcam and Foucault test?

["Polk, Tom" <TPolk@decatur-al.gov>]

Hello,

I purchased a coated 12.5mm diameter x 20mm f.l. achromat from Surplus
Shed. Disassembled the original lens and used a blackened piece of 0.5"
OD copper for an "extender" (I don't recall the length, but the AOL
would equal 0.78" minus focus "play"). Time has to been spent making
everything "square" with the CCD.

Here are some factory made:

http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productID=2
196

http://ez-toyz.com/item.asp?cID=32&scID=49&PID=210

http://www.bhphotovideo.com/bnh/controller/home?O=breadCrumb&A=FetchChil
dren&Q=&ci=3496

http://www.beyondlogic.org/imaging/camera1.htm

http://www.jr.com/JRProductPage.process?Product_Code=SWN+SWPTLBLI&JRSour
ce=PriceGrabber.datafeed.SWN+SWPTLBLI

http://www.eyespyvideo.com/lenses/ls-250.htm

http://www.polarisusa.com/cgi-bin/view_product_detail.pl?listing_categor
y_id=&product_category_id=23&template_id=10


Tom Polk
>SNIP<
> The web cam has a fixed 20mm lens, both the focus and manual settings

Which brand lens, where did you get it?

I purchased a 16mm lens, but cannot get it to focus when screwed in the
ToCam 840 threading. Image plane is to far behind the final lens when
the
object is on 3m (10') or so.

Arjan te Marvelde

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