Recently, someone posted a link to the following youtube news item which shows an image of a large shield-like structure supported by struts extending from some object positioned near its focus:
If this shield is as far away as Venus, it would be huge. Most likely it is much closer to us. It is a puzzle what the thing is.
It appears that the above youtube link was in error in assuming this to be a real phenomenon. It appears just to be a telescope lens flare. See the following link sent bin a comment from Patricia: http://youtu.be/gRM2ns1LM-c.