Seeking ways of tracking birds in flight with 500mm lens

Started May 23, 2013 | Discussions thread
Tan68
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Re: Seeking ways of tracking birds in flight with 500mm lens
In reply to rogerstpierre, May 29, 2013

I also thought it was a laser sight... I had the same concerns plus one that the photographer may be arrested if he is near an airport.

In a thread a few months ago, I learned it is just like gun sights.  With a shorter barrel.  I suppose you align it like you would the lower magnification sight alongside an astronomical telescope.

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