through the opera glasses

Yes, thats exactly what it is - Chucky C and his blues band on stage as seen through the opera glasses.

That's real advantage of having a seat far back in the hall - not too strict control on partisans like me taking blips from time to time. It was fun trying to catch the stage and then musicians through this tiny point in the glasses which magnifies the area I was aiming to see. Not perfect, but I really like the result.

On the subject of taking blips at concerts which is strictly speaking - prohibited, this concert was a happy abolishing of these rules both ways - the band was so taken by the audience, they took a few selfies on the stage - attached to the extra.