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The most difficult problem to solve in camera build is which optical device and type to use. If you search NBTV.org Forum area for S1223 you'll find some lengthly discussions on using Hamamatsu S1223-01 photodiode versus the BPW34.
A side note NBTV shopsales lists the S1223-01 at over 10 UK pounds plus shipping. You need to join NBTV for about $5 to purchase from them. Their shop is a source for a lot of components for building a mechanical camera and/or receiver. The S1223-01 photodiode is also available online at Newark for $10.73 with standard shipping for all orders under $150 at $9.99. You can find the BPW34 selling various locations on ebay for under $3 with free shipping.
The photodiode used in Peter Yanczer's mechanical camera kit seems not be be available anywhere.
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