Ron,
unless you have moderator's permission, business self promoting threads are not allowed on this forum.
As already mentioned, your shutter is not a focal plane shutter. The fact that you sell them as such on Ebay violate also the Ebay policy. You're misleading people with that description.
Also, Newton speaks about free fall. Your shutter is not falling with free fall. If you measured its speed electronically you would find out that you cannot guarantee its precise speed - it has none.
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